The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform

Ahmed A. Shabana - One of the best experts on this subject based on the ideXlab platform.

  • Pantograph/Catenary Contact Formulations
    Journal of Vibration and Acoustics, 2016
    Co-Authors: Shubhankar Kulkarni, Carmine Maria Pappalardo, Ahmed A. Shabana
    Abstract:

    In this investigation, the pantograph/catenary contact is examined using two different formulations. The first is an elastic contact formulation that allows for the catenary/panhead separation and for the analysis of the effect of the aerodynamic forces, while the second approach is based on a constraint formulation that does not allow for such a separation by eliminating the freedom of relative translation in two directions at the catenary/panhead contact point. In this study, the catenary system, including the contact and messenger wires, is modeled using the nonlinear finite element (FE) absolute nodal coordinate formulation (ANCF) and flexible multibody system (MBS) algorithms. The generalized aerodynamic forces associated with the ANCF position and gradient coordinates and the pantograph reference coordinates are formulated. The new elastic contact formulation used in this investigation is derived from the constraint-based Sliding Joint formulation previously proposed by the authors. By using a unilateral penalty force approach, separation of the catenary and panhead is permitted, thereby allowing for better evaluating the response of the pantograph/catenary system to wind loading. In this elastic contact approach, the panhead is assumed to have six degrees-of-freedom with respect to the catenary. The coordinate system at the pantograph/catenary contact point is chosen such that the contact model developed in this study can be used with both the fully parameterized and gradient deficient ANCF elements. In order to develop a more realistic model, the MBS pantograph model is mounted on a detailed three-dimensional MBS rail-vehicle model. The wheel/rail contact is modeled using a nonlinear three-dimensional elastic contact formulation that accounts for the creep forces and spin moment. In order to examine the effect of the external aerodynamic forces on the pantograph/catenary interaction, two scenarios are considered in this investigation. In the first scenario, the crosswind loading is applied on the pantograph components only, while in the second scenario, the aerodynamic forces are applied on the pantograph components and also on the flexible catenary. For the configuration considered in this investigation, it was found that the crosswind assists the uplift force exerted on the pantograph mechanism, increasing the mean contact force value. Numerical results are presented in order to compare between the cases with and without the wind forces.

  • Pantograph/catenary contact force control
    Volume 6: 11th International Conference on Multibody Systems Nonlinear Dynamics and Control, 2015
    Co-Authors: Carmine Maria Pappalardo, Mohil Patel, Brian Tinsley, Ahmed A. Shabana
    Abstract:

    In this paper, a new continuum-based pantograph/catenary model based on the absolute nodal coordinate formulation (ANCF) is proposed and used to develop an effective method to control the contact force which arises from the pantograph/catenary interaction. In the proposed new model, only one ANCF gradient vector is used in the formulation of the pantograph/catenary contact conditions, thereby allowing for using the proposed approach for both fully parameterized and gradient deficient ANCF finite elements. A three-dimensional multibody system (MBS) model of a pantograph mounted on a train is developed using a nonlinear augmented MBS formulation. In order to take into account the catenary large deformation, ANCF finite elements are used. The contact between the pantograph and the catenary system is ensured using a Sliding Joint constraint whereas the contact between the rail vehicle wheels and the train track is modelled using an elastic contact formulation. In addition to the use of the new MBS approach to model the pantograph/catenary interaction, the contact force between the pantograph and the catenary is computed using a simpler lumped parameter model which describes the pan-head and the plunger subsystem dynamics. In order to reduce the standard deviation of the contact force without affecting its mean value, a control actuator is used between the pan-head and the plunger. To this end, three types of control laws for the control action are designed to improve the contact quality both in the transient phase and in the steady state phase of the pantograph/catenary interaction. The first control law proposed features a feedback structure whereas the second and the third control strategies employ a feedback plus feed-forward architecture. In order to demonstrate the effectiveness of the proposed method, the results of a set of numerical simulations with and without the controllers are presented.Copyright © 2015 by ASME

  • Three-Dimensional Large Deformation Analysis of the Multibody Pantograph/Catenary Systems
    Nonlinear Dynamics, 2005
    Co-Authors: Jong-hwi Seo, Hiroyuki Sugiyama, Ahmed A. Shabana
    Abstract:

    To accurately model the nonlinear behavior of the pantograph/catenary systems, it is necessary to take into consideration the effect of the large deformation of the catenary and its interaction with the nonlinear pantograph system dynamics. The large deformation of the catenary is modeled in this investigation using the three-dimensional finite element absolute nodal coordinate formulation. To model the interaction between the pantograph and the catenary, a Sliding Joint that allows for the motion of the pan-head on the catenary cable is formulated. To this end, a non-generalized arc-length parameter is introduced in order to be able to accurately predict the location of the point of contact between the pan-head and the catenary. The resulting system of differential and algebraic equations formulated in terms of reference coordinates, finite element absolute nodal coordinates, and non-generalized arc-length and contact surface parameters are solved using computational multibody system algorithms. A detailed three-dimensional multibody railroad vehicle model is developed to demonstrate the use of the formulation presented in this paper. In this model, the interaction between the wheel and the rail is considered. For future research, a method is proposed to deal with the problem of the loss of contact between the pan-head and the catenary cable.

  • spatial Joint constraints in flexible multibody systems using the absolute nodal coordinate formulation
    ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, 2003
    Co-Authors: Hiroyuki Sugiyama, Jose L Escalona, Ahmed A. Shabana
    Abstract:

    This paper is concerned with the formulation and computer implementation of spatial Joint constraints and generalized forces using the large deformation absolute nodal coordinate formulation. Unlike the floating frame of reference formulation that employs a mixed set of absolute reference and local elastic coordinates, in the absolute nodal coordinate formulation, global displacement and slope coordinates are used. The nonlinear kinematic constraint equations and generalized force expressions are expressed in terms of the absolute global displacements and slopes. In particular, a new formulation for the Sliding Joint between two very flexible bodies is developed. A contact parameter is introduced as an additional new variable in order to facilitate the formulation of this Sliding Joint. Numerical examples are presented in order to demonstrate the use of the formulations developed in the paper.Copyright © 2003 by ASME

  • Formulation of Three-Dimensional Joint Constraints Using the Absolute Nodal Coordinates
    Nonlinear Dynamics, 2003
    Co-Authors: Hiroyuki Sugiyama, Jose L Escalona, Ahmed A. Shabana
    Abstract:

    A wide variety of mechanical and structural multibody systems consist ofvery flexible components subject to kinematic constraints. The widelyused floating frame of reference formulation that employs linear modelsto describe the local deformation leads to a highly nonlinear expressionfor the inertia forces and can be applied to only small deformationproblems. This paper is concerned with the formulation and computerimplementation of spatial Joint constraints and forces using the largedeformation absolute nodal coordinate formulation. Unlike the floatingframe of reference formulation that employs a mixed set of absolutereference and local elastic coordinates, in the absolute nodalcoordinate formulation, global displacement and slope coordinates areused. The nonlinear kinematic constraint equations and generalized forceexpressions are expressed in terms of the absolute global displacementsand slopes. In particular, a new formulation for the Sliding Jointbetween two very flexible bodies is developed. A surface parameter isintroduced as an additional new variable in order to facilitate theformulation of this Sliding Joint. The constraint and force expressionsdeveloped in this paper are also expressed in terms of generalizedCholesky coordinates that lead to an identity inertia matrix. Severalexamples are presented in order to demonstrate the use of theformulations developed in the paper.

Hiroyuki Sugiyama - One of the best experts on this subject based on the ideXlab platform.

  • Sliding and NonSliding Joint Constraints of B-Spline Plate Elements for Integration With Flexible Multibody Dynamics Simulation
    Journal of Computational and Nonlinear Dynamics, 2013
    Co-Authors: Yuta Mizuno, Hiroyuki Sugiyama
    Abstract:

    In this investigation, a numerical procedure for modeling Sliding and nonSliding Joint constraints for the B-spline thin plate element is developed for the large deformation analysis of multibody systems. A concept of intermediate reference coordinates proposed for the absolute nodal coordinate formulation is generalized for B-spline elements such that a wide variety of Joint constraints can be modeled using existing Joint constraint libraries already implemented in multibody dynamics codes. This procedure allows for modeling Sliding Joints for B-spline elements that requires a solution to moving boundary problems by introducing time-variant surface parameters in the B-spline parametric domain. Since surface parameters treated as knot variables in the basis function are defined in the entire parametric domain rather than the element domain, the location of the constraint definition point can be determined without knowing in which elements the Sliding point is located. Furthermore, using the B-spline recurrence formula, control points used for describing the constraint equations can be systematically extracted. It is shown that many types of nonSliding Joints fixed on the flexible body can also be modeled as a special case of the Sliding Joint formulation developed in this investigation, leading to a unified Joint constraint formulation for B-spline elements. Several numerical examples are presented in order to demonstrate the use of the numerical procedure developed in this investigation.

  • development of flexible telescopic boom model using absolute nodal coordinate formulation Sliding Joint constraints with lugre friction
    Theoretical and Applied Mechanics Letters, 2012
    Co-Authors: Hiroki Fujita, Hiroyuki Sugiyama
    Abstract:

    In this investigation, a modeling procedure of a telescopic boom of cranes is developed using the absolute nodal coordinate formulation together with the Sliding Joint constraints. Since telescopic booms are extracted and retracted under various operating conditions, the overall length of the boom changes dynamically, leading to the time-variant vibration characteristics. For modeling the telescopic structure of booms, a special care needs to be exercised since the location of the Sliding contact point moves along the deformable axis of the flexible boom and the solution to a moving boundary problem is required. This issue indeed makes the modeling of the telescopic boom difficult, despite the significant needs for the analysis. It is, therefore, the objective of this investigation to develop a modeling procedure for the flexible telescopic boom by considering the Sliding contact condition with the dynamic frictional effect. To this end, the Sliding Joint constraint developed for the absolute nodal coordinate formulation is employed for describing relative Sliding motion between flexible booms, while flexible booms are modeled using the beam element of the absolute nodal coordinate formulation, which allows for modeling the large rotation and deformation of the structure.

  • Sliding Joint Constraints for the Analysis of Flexible Multibody Systems Using Intermediate Coordinates
    Volume 7: Dynamic Systems and Control; Mechatronics and Intelligent Machines Parts A and B, 2011
    Co-Authors: Ryo Honda, Hiroki Yamashita, Hiroyuki Sugiyama
    Abstract:

    In this investigation, formulations of Sliding Joint constraints for flexible bodies modeled using the absolute nodal coordinate formulation are developed using intermediate coordinates. Since modeling of prismatic and cylindrical Joints for flexible bodies requires solutions to moving boundary problems in which Joint definition points are moving on flexible bodies, arc-length coordinates are introduced for defining time-variant constraint definition points on flexible bodies. While this leads to a systematic modeling procedure for Sliding Joints, specialized formulations and implementations are required in general multibody dynamics computer algorithms. For this reason, intermediate coordinates are introduced to derive a mapping between the generalized gradient coordinates used in the absolute nodal coordinate formulation and the intermediate rotational coordinates used for defining the orientation constraints with rigid bodies. With this mapping, existing Joint constraint libraries formulated for rigid bodies can be employed for the absolute nodal coordinate formulation without significant modifications. It is also demonstrated that the intermediate coordinates and arc-length coordinates introduced for modeling Sliding Joint constraints can be systematically eliminated from the equations of motion and standard differential algebraic equations used in general multibody dynamics computer algorithms can be obtained. Several numerical examples are presented in order to demonstrate the use of the formulation developed in this investigation.Copyright © 2011 by ASME

  • Three-Dimensional Large Deformation Analysis of the Multibody Pantograph/Catenary Systems
    Nonlinear Dynamics, 2005
    Co-Authors: Jong-hwi Seo, Hiroyuki Sugiyama, Ahmed A. Shabana
    Abstract:

    To accurately model the nonlinear behavior of the pantograph/catenary systems, it is necessary to take into consideration the effect of the large deformation of the catenary and its interaction with the nonlinear pantograph system dynamics. The large deformation of the catenary is modeled in this investigation using the three-dimensional finite element absolute nodal coordinate formulation. To model the interaction between the pantograph and the catenary, a Sliding Joint that allows for the motion of the pan-head on the catenary cable is formulated. To this end, a non-generalized arc-length parameter is introduced in order to be able to accurately predict the location of the point of contact between the pan-head and the catenary. The resulting system of differential and algebraic equations formulated in terms of reference coordinates, finite element absolute nodal coordinates, and non-generalized arc-length and contact surface parameters are solved using computational multibody system algorithms. A detailed three-dimensional multibody railroad vehicle model is developed to demonstrate the use of the formulation presented in this paper. In this model, the interaction between the wheel and the rail is considered. For future research, a method is proposed to deal with the problem of the loss of contact between the pan-head and the catenary cable.

  • spatial Joint constraints in flexible multibody systems using the absolute nodal coordinate formulation
    ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, 2003
    Co-Authors: Hiroyuki Sugiyama, Jose L Escalona, Ahmed A. Shabana
    Abstract:

    This paper is concerned with the formulation and computer implementation of spatial Joint constraints and generalized forces using the large deformation absolute nodal coordinate formulation. Unlike the floating frame of reference formulation that employs a mixed set of absolute reference and local elastic coordinates, in the absolute nodal coordinate formulation, global displacement and slope coordinates are used. The nonlinear kinematic constraint equations and generalized force expressions are expressed in terms of the absolute global displacements and slopes. In particular, a new formulation for the Sliding Joint between two very flexible bodies is developed. A contact parameter is introduced as an additional new variable in order to facilitate the formulation of this Sliding Joint. Numerical examples are presented in order to demonstrate the use of the formulations developed in the paper.Copyright © 2003 by ASME

Olivier A. Bauchau - One of the best experts on this subject based on the ideXlab platform.

  • Contact Conditions for Cylindrical, Prismatic, and Screw Joints in Flexible Multibody Systems
    Multibody System Dynamics, 2001
    Co-Authors: Olivier A. Bauchau, Carlo L. Bottasso
    Abstract:

    This paper focuses on the modeling of the contact conditionsassociated with cylindrical, prismatic, and screw Joints in flexiblemultibody systems. In the classical formulation these Joints aredeveloped for rigid bodies, and kinematic constraints are enforcedbetween the kinematic variables of the two bodies. These constraintsexpress the conditions for relative translation and rotation of the twobodies along and about a body-fixed axis, and imply the relative Slidingand rotation of the two bodies which remain in constant contact witheach other. However, these kinematic constraints no longer implyrelative Sliding with contact when one of the bodies is flexible. Toremedy this situation, a Sliding Joint and a Sliding screwJoint are proposed that involves kinematic constraints at theinstantaneous point of contact between the Sliding bodies. For Slidingscrew Joints, additional constraints are added on the relative rotationof the contacting bodies. Various numerical examples are presented thatdemonstrate the dramatically different behavior of cylindrical,prismatic, or screw Joints and of the proposed Sliding and Sliding screwJoints in the presence of elastic bodies, and the usefulness of theseconstraint elements in the modeling of complex mechanical systems.

  • On the Modeling of Prismatic Joints in Flexible Multi-Body Systems ⁄
    Computer Methods in Applied Mechanics and Engineering, 2000
    Co-Authors: Olivier A. Bauchau
    Abstract:

    This paper focuses on the modeling of prismatic Joints in flexible multi-body systems. In the classical formulation of prismatic Joints for rigid bodies, kinematic constraints are enforced between the kinematic variables of the two bodies. These constraints express the conditions for relative translation of the two bodies along a body fixed axis, and imply the relative Sliding of the two bodies which remain in constant contact with each other. However, these kinematic constraints no longer imply relative Sliding with contact when one of the bodies is flexible. To remedy this situation, a Sliding Joint is proposed that involves kinematic constraints at the instantaneous point of contact between the Sliding bodies. Various numerical examples are presented that demonstrate the dramatically different behavior of prismatic and Sliding Joints in the presence of elastic bodies.

  • On the modeling of prismatic Joints in flexible multi-body systems
    Computer Methods in Applied Mechanics and Engineering, 2000
    Co-Authors: Olivier A. Bauchau
    Abstract:

    This paper focuses on the modeling of prismatic Joints in flexible multi-body systems. In the classical formulation of prismatic Joints for rigid bodies, kinematic constraints are enforced between the kinematic variables of the two bodies. These constraints express the conditions for relative translation of the two bodies along a body fixed axis, and imply the relative Sliding of the two bodies which remain in constant contact with each other. However. these kinematic constraints no longer imply relative Sliding with contact when one of the bodies is flexible, To remedy this situation, a Sliding Joint is proposed that involves kinematic constraints at the instantaneous point of contact between the Sliding bodies. Various numerical examples are presented that demonstrate the dramatically different behavior of prismatic and Sliding Joints in the presence of elastic bodies. (C) 2000 Elsevier Science S.A. All rights reserved

Jia Xiaohong - One of the best experts on this subject based on the ideXlab platform.

  • Theoretical and Experimental Study of the Dynamics of the Tripod-Ball Sliding Joint With Clearance
    Volume 6B: 18th Biennial Conference on Mechanical Vibration and Noise, 2001
    Co-Authors: Jia Xiaohong, Ji Linhong, Jin Dewen, Zhang Jichuan
    Abstract:

    Abstract Clearance is inevitable in the kinematic Joints of mechanisms. In this paper the dynamic behavior of a crank-slider mechanism with clearance in its tripod-ball Sliding Joint is investigated theoretically and experimentally. The mathematical model of this new-type Joint is established, and the new concepts of basal system and active system are put forward. Based on the mode-change criterion established in this paper, the consistent equations of motion in full-scale are derived by using Kane method. The experimental rig was set up to measure the effects of the clearance on the dynamic response. Corresponding experimental studies verify the theoretical results satisfactorily. In addition, due to the nonlinear elements in the improved mathematical model of the Joint with clearance, the chaotic responses are found in numerical simulation.

  • An experimental investigation of a mechanism with clearance in tripod-ball Sliding Joint
    Journal of Tsinghua University, 2001
    Co-Authors: Jia Xiaohong
    Abstract:

    An experimental rig for studying the effect of the Joint clearance was set up in order to testify the accuracy of clearance model and the reliability of numerical simulation. The parameters such as additional displacements, driving torque, speed and acceleration of the slider were measured simultaneously using eddy current transducers, accelerometers, etc. The signals were recorded with DP16 data acquisition system, and were processed directly by special software. The experimental results show good agreement with the theoretical ones. Furthermore, the factors which have influence on the results are discussed. The conclusions are useful for modification of clearance model and further dynamic study of the mechanism including Joint with clearance.

  • Modeling of tripod-ball Sliding Joint with clearance
    Journal of Tsinghua University, 2000
    Co-Authors: Jia Xiaohong
    Abstract:

    A mathematic model of a Joint with clearance is important for the dynamic study of the mechanisms. These kinds of passing model can not exactly coincide with the actual motion. In this paper focusing on the defects of these models, based on the elastic contact theory, the new nonlinear equivalent spring and dash pot were presented, and the equations were set up. Taking into consideration the special structure of the tripod ball Sliding Joint, a set of constraint equations was obtained. The theoretical and experimental results showed good agreement, so that it can be found that the model of Joint with clearance presented here is competent. The analysis in this paper provides a valuable basis for the further dynamic study of mechanisms including Joints with clearance.

  • The Effects of Joint Clearance on the Motion Precision of the Machines
    Initiatives of Precision Engineering at the Beginning of a Millennium, 1
    Co-Authors: Jia Xiaohong, Ji Linhong, Jin Dewen, Zhang Jichuan
    Abstract:

    Joint clearance is one of important factors which affect motion precision of machines. In this paper the mathematical model of a new-type Joint, tripod-ball Sliding Joint, is established, and the new concepts of basal system and active system are put forward. Based on the mode-change criterion established here, the consistent equations of motion in full-scale are derived by using Kane method. The dynamic behavior of the crank-slider mechanism with clearance in the tripod-ball Sliding Joint is investigated. The results including motion error and impact acceleration are obtained and the advantage of this new Joint is shown.

Martina Smirakova - One of the best experts on this subject based on the ideXlab platform.

  • Design of Bitumen Asphalt Belt Sliding Joint Based on Experiment Results
    Key Engineering Materials, 2017
    Co-Authors: Pavlina Mateckova, Martina Smirakova, Jan Kubosek, Radim Čajka
    Abstract:

    Foundation structures are usually exposed to dominant vertical load. However, in some cases there is also significant value of horizontal load caused e.g. by horizontal terrain deformation on areas attached with underground mining or by horizontal deformation of foundation structure due to pre-stressing, creep, shrinkage, and temperature variation. Through the friction between subsoil and foundations, the foundation structure must resist significant normal forces. The idea of Sliding Joints between subsoil and foundation structure, which eliminates the friction in footing bottom, comes from the 1970’s. The bitumen asphalt belt given rheological properties has been proven as an effective material for Sliding Joints. In the paper there are test results of shear resistance of currently used asphalt belts. The test results are used for subsoil shear stress analysis in model example of strip foundation. Shear resistance is calculated according to Czech code for designing buildings on undermined area and also using advanced FEM analysis.

  • Comparison of the Shear Resistance in the Sliding Joint between Asphalt Belts and Modern PVC Foils
    Applied Mechanics and Materials, 2014
    Co-Authors: Martina Smirakova
    Abstract:

    This paper deals with Sliding Joint in the foundation structure. Application of Sliding Joint into foundation structure is an effective method to reduce effect of horizontal deformation of foundations. These can arise from effect of undermining or from shrinkage or creep of concrete. A different material can be used to create Sliding Joint but some are advantageous and some are not. It is often used an asphalt belt or newly different modern foils are used too. Different types of asphalt belts are tested at Faculty of Civil Engineering at different loads and at different temperatures. Some foils are tested too. The effect of ambient temperature is monitored to better description of temperature dependency of asphalt belts. Long-term goal of this research is to simplify process of design buildings with Sliding Joint and to help designer with right choice of the most advantageous material.

  • New Knowledge in the Field of Reduction of Shear Stress in the Foundation Structures of Concrete or Masonry Structures
    Advanced Materials Research, 2014
    Co-Authors: Martina Smirakova
    Abstract:

    This paper deals with application of Sliding Joint into foundation structures which can be very helpful in case that the foundation structure is exposed to effect of relative horizontal deformation. These deformations can be created direct in the structure from the effect of creep or shrinkage of concrete, from the effect of pre-stressing of foundation structure or they can arise in the subsoil as a consequence of undermining. Sliding Joints are often created from asphalt belts which help to increase of friction forces in the foundation bottom. Due to fact that today s market gives a lot of new modern materials, the laboratory tests are carried out to verify their behavior at the Faculty of Civil Engineering VSB Technical University of Ostrava (Czech Republic). The basic principle of these tests is to simulate real behavior Sliding Joint in foundation structure and great attention is also focused on thermal sensitivity of majority of used materials. Thermal sensitivity at the action of mechanical load relates closely with their rheological properties. Rheology is the science about deformation of substances in the dependence on time and it helps to describe difficult materials using simpler rheological materials models. A right created rheological model of asphalt belt could be used to prediction of behavior of Sliding Joint with regard to time of loading and ambient temperature. The knowledge of change of asphalt belt behavior consequently to temperature change could be used in the future to design of this type Sliding Joint where the temperature will be not only monitored but also managed in the dependence on necessity of increasing or decreasing of shear resistance. Partial results from laboratory tests as well as current conclusion will be presented in this paper.

  • Sliding Joints from Traditional Asphalt Belts
    Advanced Materials Research, 2014
    Co-Authors: Martina Smirakova, Marie Stará, Petr Mynarčík
    Abstract:

    Problems with horizontal deformation in the subsoil are often solved for building on undermined areas not only in our region. There are many ways to solve this problem. The existing building can be draw together in total or stiffened belt can be carried out around the structure foundation. But the best solution is that which is carried out beforehand. One of the methods which can be applied beforehand is using of Sliding Joint with using of rheological properties of asphalt. The basic principle of this method lies on application an asphalt belts or another material between foundation and subsoil. It is also created concrete base layer between Sliding layer and subsoil to ensure base flatness and to protect of Sliding layer material. The type of material is important for correct function of Sliding Joint and there are very often used the rheological properties of traditional asphalt belts. The laboratory tests are carried out at the Faculty of Civil Engineering VSB-Technical University of Ostrava to verify their rheological behavior at different loads and different temperatures. Following the test there is the effort to use of obtained values to other calculations and there is effort to contribute to innovation of currently method of design which is based on old materials from the 80th. The principle and the results from the laboratory test as well as current conclusions will be presented in this paper.

  • Behavior of Selected Materials to Create Sliding Joint in the Foundation Structure
    Advanced Materials Research, 2013
    Co-Authors: Martina Smirakova
    Abstract:

    Some foundation structures can be loaded with horizontal stress, for example pre-stressed foundation structures or structures on undermining areas. Then it is necessary to solute their effects, because they can have very significant effect on the building. When it is spoken about the foundation structures which are loaded with horizontal stress then it is spoken about two possibilities of this loading. In the first case there are horizontal deformations in the structure and in the second case these deformations can arise in the subsoil. In both of them it can be used the method with using Sliding Joint to increase of shear stress between foundation structure and subsoil. Asphalt belt is often used to create this Sliding Joint. At the faculty of Civil Engineering some materials are tested to better knowledge of asphalt belts properties and to more precise design and calculation of Sliding Joint.