The Experts below are selected from a list of 23502 Experts worldwide ranked by ideXlab platform
Yahya C Kurama - One of the best experts on this subject based on the ideXlab platform.
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nonlinear behavior of precast concrete coupling beams under Lateral Loads
Journal of Structural Engineering-asce, 2007Co-Authors: Brad D Weldon, Yahya C KuramaAbstract:This paper presents an analytical investigation of the nonlinear behavior of precast concrete coupling beams under monotonic Lateral loading. In contrast to conventional monolithic concrete coupling beams, coupling of reinforced concrete wall piers in the proposed system is achieved by posttensioning the beams and the walls together at the floor and roof levels. Under Lateral Loads, the nonlinear deformations of the coupling beams occur primarily due to the opening of gaps at the beam-to-wall interfaces. The new system offers several advantages over monolithic systems, such as simpler detailing for the beams and the wall piers (no need for diagonal reinforcement crossing the beam-to-wall joints), reduced damage to the structure, and an ability to self-center, thus reducing the residual Lateral displacements of the building after a large earthquake. Steel top and seat angles are used at the beam ends to yield and provide energy dissipation during the earthquake. The paper investigates the effects of design parameters, such as the amount of posttensioning, beam and wall properties, and top and seat angle properties, on the Lateral strength and displacement characteristics of floor-level coupling beam subassemblies. The results are used to determine how the system behavior can be controlled by design. A procedure to estimate the nonlinear Lateral load-deformation relationship of the subassemblies is developed.
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posttensioned hybrid coupled walls under Lateral Loads
Journal of Structural Engineering-asce, 2004Co-Authors: Yahya C Kurama, Qiang ShenAbstract:This paper describes an analytical investigation of a new type of hybrid coupled wall system for seismic regions. Coupling of concrete walls is achieved by posttensioning steel beams to the walls using unbonded posttensioning tendons. Different from conventional hybrid coupled walls, the coupling beams of the new system are not embedded into the walls. The effect of structural design parameters such as the amount of posttensioning, beam properties, and wall properties on the behavior of multistory coupled walls under Lateral Loads, including the amount of coupling, energy dissipation, and displacement capacity is investigated. Systems with precast concrete walls as well as monolithic cast-in-place reinforced concrete walls are considered. The behavior of posttensioned coupled wall systems is com- pared with the behavior of systems with embedded steel coupling beams and systems without coupling. Design tools to estimate the nonlinear Lateral load-displacement behavior of the walls are developed by quantifying selected limit states for the walls. The results indicate that posttensioned hybrid coupled walls with initial stiffness similar to walls with embedded steel coupling beams can be designed to provide stable levels of resistance under Lateral Loads over large nonlinear cyclic deformations. The degree of coupling between the walls can be controlled by changing the amount of posttensioning in the beams, as well as other beam and wall properties.
Henryk K. Stolarski - One of the best experts on this subject based on the ideXlab platform.
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application of the arc length method for the stability analysis of solid unreinforced masonry walls under Lateral Loads
Engineering Structures, 2005Co-Authors: Arturo E. Schultz, Henryk K. StolarskiAbstract:Abstract The stability behavior of slender unreinforced masonry members (URM) under out-of-plane Lateral Loads in proportion to the axial load is investigated, using a finite element model developed previously [Lu M, Schultz AE, Stolarski HK. Analysis of the influence of tensile strength on the stability of eccentrically compressed slender unreinforced masonry walls under Lateral Loads. Journal of Structural Engineering (ASCE) 2004;130(6):921–33]. However, significant changes are made to the solution procedure, the most important of which is application of the arc-length method. A very slender wall with a height–thickness ratio of 30 is used as an example for systematic analysis. The influence of tensile strength and slenderness parameter on the buckling capacity is also investigated. It is found that tensile strength, though very low, may produce peculiar phenomena in the post-buckling equilibrium paths. Lateral Loads are shown to have a similar effect on the buckling behavior to vertical load eccentricity.
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Analysis of the Influence of Tensile Strength on the Stability of Eccentrically Compressed Slender Unreinforced Masonry Walls under Lateral Loads
Journal of Structural Engineering-asce, 2004Co-Authors: Arturo E. Schultz, Henryk K. StolarskiAbstract:A comprehensive finite element model is presented for the combined material and geometric nonlinear analysis of slender unreinforced masonry walls, with the capability of capturing postcracking and postbuckling behavior. Material tensile strength is taken into consideration; an exponential stress-strain relationship is adopted for the compressive region and its smooth linear extension is used for the tensile region. This model is applicable under different load combinations (concentrated and distributed Lateral Loads, vertical load with eccentricity, as well as self-weight) and different restraint conditions. Numerical results of the model show good agreement with experimental results, as well as with analytical results in published technical papers.
S Gopalakrishnan - One of the best experts on this subject based on the ideXlab platform.
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analysis and design of rc tall building subjected to wind and earthquake Loads
Eighth Asia-Pacific Conference on Wind Engineering, 2013Co-Authors: Rama K Raju, M I Shereef, Nagesh R Iyer, S GopalakrishnanAbstract:Consideration of site specific Lateral loading due to wind or earthquake Loads along with vertical gravity Loads is important for finding the behavior of the tall buildings. As the height of a building becomes taller, the amount of structural material required to resist Lateral Loads increases drastically. The design of tall buildings essentially involves a conceptual design, approximate analysis, preliminary design and optimization, to safely carry gravity and Lateral Loads. The design criteria are strength, serviceability and human comfort. The aim of the structural engineer is to arrive at suitable structural schemes, to satisfy these criteria. In the present study, the limit state method of analysis and design of a 3B+G+40-storey reinforced concrete high rise building under wind and seismic Loads as per IS codes of practice is described. Safety of the structure is checked against allowable limits prescribed for base shear, roof displacements, inter-storey drifts, accelerations prescribed in codes of practice and other relevant references in literature on effects of earthquake and wind Loads on buildings.
Ivica Kožar - One of the best experts on this subject based on the ideXlab platform.
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Validation of a simplified micromodel for analysis of infilled RC frames exposed to cyclic Lateral Loads
Bulletin of Earthquake Engineering, 2016Co-Authors: Davorin Penava, Vladimir Sigmund, Ivica KožarAbstract:An RC frame structure with masonry infill walls (“framed-masonry”) exposed to Lateral Loads acts as a composite structure. Numerical simulation of framed-masonry is difficult and generally unreliable due to many difficulties and uncertainties in its modelling. In this paper, we reviewed the usability of an advanced non-linear FEM computer program to accurately predict the behaviour of framed-masonry elements when exposed to cyclic Lateral loading. Numerical results are validated against the test results of framed-masonry specimens, with and without openings. Initial simplified micromodels were calibrated by adjustment of the input parameters within the physically justifiable borders, in order to obtain the best correlation between the experimental and numerical results. It has been shown that the use of simplified micromodels for the investigation of composite masonry-infilled RC frames requires in-depth knowledge and engineering judgement in order to be used with confidence. Modelling problems were identified and explained in detail, which in turn offer an insight to practising engineers on how to deal with them.
Jatin A Desai - One of the best experts on this subject based on the ideXlab platform.
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evaluation of rc and sfrc exterior beam column joint under cyclic loading for reduction in Lateral reinforcement of the joint region
Magazine of Concrete Research, 2013Co-Authors: Priti A Patel, Atul K Desai, Jatin A DesaiAbstract:The integrity of a reinforced concrete structure should be safe and stable under Lateral Loads, especially those structures that depend on the behaviour of the beam–column joint. The ductility capa...
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evaluation of rc and sfrc exterior beam column joint under cyclic loading for reduction in Lateral reinforcement of the joint region
Magazine of Concrete Research, 2013Co-Authors: Priti A Patel, Atul K Desai, Jatin A DesaiAbstract:The integrity of a reinforced concrete structure should be safe and stable under Lateral Loads, especially those structures that depend on the behaviour of the beam–column joint. The ductility capacity of structural elements has a key role to play in seismic design. The ability of the structure to sustain levels of inelastic deformation under Lateral Loads, implicit in ductility values, is dependent on the material and detailing used. For the ductile behaviour of beam–column joints, a considerable amount of Lateral reinforcement is necessary. An experimental investigation is presented on the use of steel fibre reinforced concrete (SFRC) to provide ductility in a beam–column joint even after the increase in hoop spacing of Lateral ties. Six one-third scale exterior beam–column joints were tested under reverse cyclic loading. The SFRC beam–column joint contained volume fraction of 1·5% steel fibre for all variable hoop spacing. The results were compared and evaluated with respect to strength, displacement d...
