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Kang-hai Tan - One of the best experts on this subject based on the ideXlab platform.

  • Behavior of Composite Beam-Column Joints in a Middle-Column-Removal Scenario: Experimental Tests
    Journal of Structural Engineering, 2014
    Co-Authors: Bo Yang, Kang-hai Tan
    Abstract:

    A series of experiments has been conducted to investigate the failure modes and ductility of composite beam-column joints in a middle-column-removal scenario. Composite web cleat and flush end plate connections were studied. The research included two types of tests: namely, middle joints under a sagging Moment and side joints under a Hogging Moment. Five composite beam-column joints with reentrant steel profile decking were tested. The contributions from two types of mechanisms (namely, flexural action and catenary action) have been identified. The main objective of the experimental program is to study the behavior of composite joints in a middle-column-removal scenario. The test results demonstrate the ductility and load resistances of these five specimens in catenary action mode, and indicate that at the initial loading stage, the applied load was resisted by flexural action, while at the large deformation stage, the load was resisted by catenary action. It is also found that composite slabs could increase the load-carrying capacities of beam-column joints at both the flexural action and catenary action stages. The strengthened web cleat connection has a much higher load-carrying capacity than the normal web cleat connection because the former could sustain greater deformation.

  • experimental and numerical investigation on ductility of composite beams in the Hogging Moment regions under fire conditions
    Journal of Structural Engineering-asce, 2008
    Co-Authors: Ronny Budi Dharma, Kang-hai Tan
    Abstract:

    This paper presents both the results of an experimental program and numerical simulations, which have been conducted to investigate the ductility of composite beams in the Hogging Moment regions under fire conditions. The main objective is to study the ductility issue related to the inelastic behavior of composite beams at an elevated temperature. A second objective is to investigate the feasibility of using a finite-element model for parametric studies. To fullfil the first objective, a total of four composite beams with decking slabs were tested to failure. They were designed to represent the internal joint of a continuous beam. The segment between the plastic hinge over support and adjacent point of inflection was represented by one-half of a simply supported beam subjected to a midspan point load. The specimens were heated to a certain temperature before they were subjected to a static point load up to failure. These four test results were then used to validate finite-element models constructed from MSC. Marc Mentat. It is demonstrated that the finite-element analysis gives reasonable accuracy compared to test results. Hence, it provides an efficient, economical, and yet accurate tool to study the inelastic behavior of composite beams in fire. Finally, a parametric study was conducted to investigate the influence of several parameters on the Moment-rotation response and the rotational capacity at elevated temperatures.

Bradford, Mark A - One of the best experts on this subject based on the ideXlab platform.

  • Elastic bubble augmented spline finite strip method in analysis of continuous composite beams
    Institution of Engineers Australia, 2007
    Co-Authors: Vrcelj Zora, Bradford, Mark A
    Abstract:

    Local and overall instabilities of the steel beam occur in the Hogging-Moment\ud region in a continuous composite beam and these forms of buckling have been recognised to be\ud highly interactive. The overall mode of buckling in composite steel-concrete tee-beams in regions\ud of negative bending is what is herein termed restrained-distortional buckling (RDB). In negative\ud bending the slab restrains the tension region of the steel and the neutral axis is not located at the\ud mid-height of the web. The neutral axis is shifted towards the top fl ange, and in negative bending\ud the steel region is subjected to predominantly compressive loading. In addition, the web usually\ud carries proportionally higher shear loads than in ordinary steel beams. The lateral-distortional\ud buckling resistance of the steel portion in continuous composite beams is therefore dependent on\ud the extent to which the web can provide a restraining action to the unstable compression fl ange.\ud This form of buckling is usually prevented in bridge girders by the cross bracing and the common\ud view amongst engineers is that such bracing is excessive and uneconomical. Although buckling\ud of plain steel beams in both the elastic and inelastic ranges of structural response has been studied\ud extensively and a great deal of research work has been devoted to the understanding of their buckling\ud modes, and codes of practice for the design of structural steelwork contain relevant clauses that\ud presently are considered to be quite accurate, buckling of the steel component in composite beams\ud still represents a grey area in structural engineering research and is much less well documented. The\ud bubble augmented spline fi nite strip method of analysis, developed by the authors, is thus employed\ud herein to study extensively the issue of RDB in composite tee-beams in Hogging bending regions.\ud The numerical investigations demonstrate that RDB mode is a governing mode for steel I-sections\ud with one fl ange fully restrained, variations of the web slenderness parameter have a most pronounced\ud infl uence on the elastic buckling capacity of composite T-section beams and the deformations can\ud be reasonably large in the proximity of the internal supports and near the concentrated forces

  • Elastic bubble augmented spline finite strip method in analysis of continuous composite beams
    Tour Hosts, 2005
    Co-Authors: Vrcelj Zora, Bradford, Mark A
    Abstract:

    Local and overall instabilities of the steel beam occur in the Hogging-Moment region in a continuous composite beam (Figure 1) and these forms of buckling have been recognised to be highly interactive. The overall mode of buckl ing in composite steel-concrete tee-beams in regions of negative bending is what is herein te rmed restrained-distortio nal buckling (RDB). In negative bending the slab restrains the tension re gion of the steel and the neutral axis is not located at the mid-height of the web. The neutra l axis is shifted towards the top/tension flange, and in negative bending the steel region is subjected to predominantly compressive loading. In addition, the web usually carries proportionally higher shear loads than in ordinary steel beams. The lateral-distortional buckling resistance of th e steel portion in continuous composite beams is therefore dependent on the extent to which the web can provide a restraining action to the unstable compression flange. Although buckling of plain steel beams in both the elastic and inelastic ranges of structural response has been studied extensively and a great deal of research work has been devoted to the understanding of their buckling modes, and codes of practice for the design of structural steelwork contain relevant clauses that presently are considered to be quite accurate, buckling of the steel component in composite beams still repr esents a grey area in structural engineering research and is much less well documented. The bubble augmented spline finite strip method of analysis, developed by the authors, is thus employed herein to study extensively the issue of RDB in composite tee-beams in Hogging bending regions

Vrcelj Zora - One of the best experts on this subject based on the ideXlab platform.

  • Elastic bubble augmented spline finite strip method in analysis of continuous composite beams
    Institution of Engineers Australia, 2007
    Co-Authors: Vrcelj Zora, Bradford, Mark A
    Abstract:

    Local and overall instabilities of the steel beam occur in the Hogging-Moment\ud region in a continuous composite beam and these forms of buckling have been recognised to be\ud highly interactive. The overall mode of buckling in composite steel-concrete tee-beams in regions\ud of negative bending is what is herein termed restrained-distortional buckling (RDB). In negative\ud bending the slab restrains the tension region of the steel and the neutral axis is not located at the\ud mid-height of the web. The neutral axis is shifted towards the top fl ange, and in negative bending\ud the steel region is subjected to predominantly compressive loading. In addition, the web usually\ud carries proportionally higher shear loads than in ordinary steel beams. The lateral-distortional\ud buckling resistance of the steel portion in continuous composite beams is therefore dependent on\ud the extent to which the web can provide a restraining action to the unstable compression fl ange.\ud This form of buckling is usually prevented in bridge girders by the cross bracing and the common\ud view amongst engineers is that such bracing is excessive and uneconomical. Although buckling\ud of plain steel beams in both the elastic and inelastic ranges of structural response has been studied\ud extensively and a great deal of research work has been devoted to the understanding of their buckling\ud modes, and codes of practice for the design of structural steelwork contain relevant clauses that\ud presently are considered to be quite accurate, buckling of the steel component in composite beams\ud still represents a grey area in structural engineering research and is much less well documented. The\ud bubble augmented spline fi nite strip method of analysis, developed by the authors, is thus employed\ud herein to study extensively the issue of RDB in composite tee-beams in Hogging bending regions.\ud The numerical investigations demonstrate that RDB mode is a governing mode for steel I-sections\ud with one fl ange fully restrained, variations of the web slenderness parameter have a most pronounced\ud infl uence on the elastic buckling capacity of composite T-section beams and the deformations can\ud be reasonably large in the proximity of the internal supports and near the concentrated forces

  • Elastic bubble augmented spline finite strip method in analysis of continuous composite beams
    Tour Hosts, 2005
    Co-Authors: Vrcelj Zora, Bradford, Mark A
    Abstract:

    Local and overall instabilities of the steel beam occur in the Hogging-Moment region in a continuous composite beam (Figure 1) and these forms of buckling have been recognised to be highly interactive. The overall mode of buckl ing in composite steel-concrete tee-beams in regions of negative bending is what is herein te rmed restrained-distortio nal buckling (RDB). In negative bending the slab restrains the tension re gion of the steel and the neutral axis is not located at the mid-height of the web. The neutra l axis is shifted towards the top/tension flange, and in negative bending the steel region is subjected to predominantly compressive loading. In addition, the web usually carries proportionally higher shear loads than in ordinary steel beams. The lateral-distortional buckling resistance of th e steel portion in continuous composite beams is therefore dependent on the extent to which the web can provide a restraining action to the unstable compression flange. Although buckling of plain steel beams in both the elastic and inelastic ranges of structural response has been studied extensively and a great deal of research work has been devoted to the understanding of their buckling modes, and codes of practice for the design of structural steelwork contain relevant clauses that presently are considered to be quite accurate, buckling of the steel component in composite beams still repr esents a grey area in structural engineering research and is much less well documented. The bubble augmented spline finite strip method of analysis, developed by the authors, is thus employed herein to study extensively the issue of RDB in composite tee-beams in Hogging bending regions

Jaspart Jean-pierre - One of the best experts on this subject based on the ideXlab platform.

  • Behaviour of composite joints under combined bending Moments and axial loads - Deliverable D.9 - Robustimpact
    RFCS, 2016
    Co-Authors: D'antimo Marina, Demonceau Jean-françois, Jaspart Jean-pierre
    Abstract:

    The present work is dedicated to the behaviour of composite joints under combined bending Moments and axial loads. The results presented in this part have been mainly developed in [1]. The component method is a nowadays widely recognized procedure for the evaluation of the design properties of structural joints. It is used as a reference method in the Eurocodes and the proposed rules in these codes are mainly devoted to the characterization of joints subjected to bending Moments and shear forces. However, in some situations, these joints can be subjected to combined axial loads and bending Moments, for instance in frames subjected to an exceptional event leading to the loss of a column, situation where significant tying forces can developed in the structural beams above the lost column. The purpose of this work is to present and validate a design model, founded on the component method, aiming at predicting the behaviour of composite joints subjected to combined axial loads and bending Moments. In particular, in the following the validation of this model through comparisons to recent experimental tests performed on steel composite beam-to-column joints at University of Stuttgart will be presented. The proposed method is mainly adapted from the former research work of Demonceau [2]. Some changes are made in order to improve the former method and also to extend it to the type of joints used in the framework of the current European project (Deliverable 5). Beam to column composite joints with flush-end-plate connection are mainly investigated hereinafter. The work will manly focus on the behaviour of joints under sagging Moments, as it has not been widely researched yet in comparison to joints under Hogging Moment. An excel-based routine of the proposed method has been developed; it has been designed to be adaptable to different types of composite joints, with the objective to facilitate the verification and/or the application of the above-mentioned design model

  • Resistance of through-plate component in beam-to-column joints with circular hollow columns
    2014
    Co-Authors: Hoang Van Long, Demonceau Jean-françois, Jaspart Jean-pierre
    Abstract:

    A configuration of beam-to-column joint with circular hollow section columns is proposed. A vertical plate, called through-plate, passing through the column is used to support the beams. In order to facilitate connecting the beams, two horizontal plates, each side of the column, are welded to the upper side of the through-plate. The lower flanges of the steel beams are connected to the horizontal plates by bolts, and the upper flanges are attached to the concrete slab by shear connections. The joint is considered as hinges in the construction phase while semi-rigid and partial strength can be adopted for the joint behaviour during the exploitation time. A development on the through-plate component of the joint is presented in this paper. Global behaviour of the joint under Hogging Moment and shear force is analysed leading to a mechanical model of the through-plate component. Using the elastic buckling theory of plates, the analytical formulas for critical stresses of the through-plate are obtained. The coefficients taking into account boundary conditions, material plasticity and geometrical imperfection are determined by finite element analysis. The proposed model is validated by experimental results showing a good accuracy. The design guideline for the component is finally provided for the practical purpose.Peer reviewe

  • Resistance of through-plate component in beam-to-column joints with circular hollow columns
    'Elsevier BV', 2014
    Co-Authors: Hoang Van Long, Demonceau Jean-françois, Jaspart Jean-pierre
    Abstract:

    peer reviewedaudience: researcher, professionalA configuration of beam-to-column joint with circular hollow section columns is proposed. A vertical plate, called through-plate, passing through the column is used to support the beams. In order to facilitate connecting the beams, two horizontal plates, each side of the column, are welded to the upper side of the through-plate. The lower flanges of the steel beams are connected to the horizontal plates by bolts, and the upper flanges are attached to the concrete slab by shear connections. The joint is considered as hinges in the construction phase while semi-rigid and partial strength can be adopted for the joint behaviour during the exploitation time. A development on the through-plate component of the joint is presented in this paper. Global behaviour of the joint under Hogging Moment and shear force is analysed leading to a mechanical model of the through-plate component. Using the elastic buckling theory of plates, the analytical formulas for critical stresses of the through-plate are obtained. The coefficients taking into account boundary conditions, material plasticity and geometrical imperfection are determined by finite element analysis. The proposed model is validated by experimental results showing a good accuracy. The design guideline for the component is finally provided for the practical purpose

  • Analysis of Semi-Continuous Composite Beams with Partial Shear Connection Using 2-D Finite Element Approach
    'Science Alert', 2008
    Co-Authors: Titoum M., Tehami M., Achour B., Jaspart Jean-pierre
    Abstract:

    peer reviewedIn this study, a two-dimensional finite element model using ANSYS software was proposed to study the behaviour of semi-continuous composite beams allowing for the concept of partial shear connection in both sagging and Hogging Moment regions. Some comparisons with experimental data available in the literature were reported to validate the efficiency of the proposed model. Using the verified model, a parametric study was carried out to investigate the effects of partial shear connection, along with the effects of reinforcing ratio and the presence of column web stiffeners, on the behaviour of semi-continuous composite beams. Based on the results obtained from the finite element analysis, the concept of partial shear connection in the Hogging Moment regions can be accepted provided that the shear connectors are sufficiently ductile, in spite of the requirement of full shear connection specified in Eurocode 4 for continuous and semi-continuous composite beams

Teruhiko Yoda - One of the best experts on this subject based on the ideXlab platform.

  • application of sfrc in steel concrete composite beams subjected to Hogging Moment
    Journal of Constructional Steel Research, 2014
    Co-Authors: Weiwei Lin, Teruhiko Yoda, Nozomu Taniguchi
    Abstract:

    Abstract This paper describes the effects of SFRC on improving the mechanical performance of composite steel and concrete beams subjected to Hogging Moment. Four specimens with different concrete slabs and different shear connectors were examined experimentally in this study. Steel fiber reinforced concrete (SFRC) was used for two specimens, and normal concrete was applied for the other two specimens. Different types of shear connectors, including shear studs and Perfo-Bond Strips (PBLs), were used on steel–slab interface of the specimens. Shrinkage of the normal and steel fiber reinforced concrete, load versus mid-span deflection relationship, crack formation and its propagation process, and slip development on the steel–slab interface were measured and investigated. The test results show that the inclusion of steel fibers decreased both the crack spacing and crack width of the concrete slab. The specimens with steel fiber reinforced concrete have relatively large initial cracking load, and crack width of the concrete slab can be controlled appropriately in the service stage. The effects of the SFRC on the ultimate load carrying capacity of the beam depend on the shear connectors applied on the steel–slab interface. The application of SFRC could enhance the load carrying capacity of the specimen with stud shear connectors, however, the effects of SFRC on the load carrying capacity of PBL specimen were found to be declined in some extent. Besides, the current specifications, such as AASHTO, EUROCODE-4 and JSCE, are typically conservative in predicting the ultimate load carrying capacity for composite beams under Hogging Moment.

  • Numerical study on horizontally curved steel-concrete composite beams subjected to Hogging Moment
    International Journal of Steel Structures, 2014
    Co-Authors: Weiwei Lin, Teruhiko Yoda
    Abstract:

    The horizontally curved continuous composite steel-concrete beams, for instance, curved continuous composite bridges, have excellent qualities, such as quick construction, good seismic performance, saving construction formwork and convenience in spatial arrangement etc. At present, the application research of this kind of structures is becoming more of a concern, but very few studies have been conducted to study the mechanical performance of composite beams subjected to combined Hogging (negative) bending and torsion. The purpose of the present study is to investigate the effects of curvatures on both elastic and inelastic behaviours of curved continuous steel-concrete composite beams in the interior support regions. Based on the experimental observations in a straight composite beam, a three-dimensional FE model capable of analysing the composite beams subjected to negative bending Moment is built. Further numerical studies on curved composite beams with different curvatures are performed in this study. Strength and load carrying capacity, sectional strain distribution and movement of composite neutral axis before and after cracking, as well as the strain results of longitudinal reinforcing bars are investigated. Besides, the interaction equation for ultimate bending and torsional Moments is proposed.

  • mechanical performance of steel concrete composite beams subjected to a Hogging Moment
    Journal of Structural Engineering-asce, 2014
    Co-Authors: Weiwei Lin, Teruhiko Yoda, Nozomu Taniguchi, Hideyuki Kasano
    Abstract:

    Limited experimental results have been reported in the literature on the fatigue and ultimate static loading behavior of composite beams subjected to negative bending Moment. This paper examines experimentally the behavior of composite steel-concrete beams. Eight composite specimens were tested to study the various aspects of composite beams under a negative bending Moment, including the effects of repeated loading, shear connectors (studs and PBLs), rubber-latex mortar coating, and steel fiber-reinforced concrete (SFRC) on their structural performance. Load versus midspan deflection, crack formation and its developing process, slip distribution on the steel-slab interface, and the flexural strain results of shear connectors were measured and studied. The test results show that the initial cracking-level repeated load did not show obvious effects, while the stabilized cracking-level repeated load can reduce the rigidity and loading capacity of composite beams. The experimental results indicate that the plastic bending Moment criteria in the current AASHTO load and resistance factor design specifications are typically conservative for composite beams under a negative bending Moment. In addition, the effects of SFRC on crack width control and adhesion bonding effects of rubber latex on the steel-slab interface were confirmed in the testing.

  • fatigue tests on straight steel concrete composite beams subjected to Hogging Moment
    Journal of Constructional Steel Research, 2013
    Co-Authors: Weiwei Lin, Teruhiko Yoda, Nozomu Taniguchi
    Abstract:

    Abstract This paper describes the fatigue behavior of composite steel and concrete beams subjected to negative bending Moment. Fatigue tests with repeated load limited to initial cracking and stabilized cracking, were performed on two steel–concrete composite beam substructures respectively. Test results indicated that when the repeated load was equivalent to the initial cracking load, the fatigue test had only limited influence on beam stiffness or crack patterns. However, when the repeated load was equivalent to the stabilized cracking load, a number of residual cracks occurred in the initial static test and the beam became less stiff as the load cycles increase. Failure of the bond between studs and surrounding concrete was confirmed in intermediate static tests; flexural stiffness of studs became smaller as the increase of load cycles. In addition, final static tests were performed on fatigue test specimens and another specimen without fatigue test. The comparison indicated that when the repeated load was larger than the initial cracking load, fatigue test could decrease beam stiffness and its ultimate load carrying capacity.

  • mechanical behavior of composite girder with perfobond shear connector under Hogging Moment
    Advanced Materials Research, 2012
    Co-Authors: Yuqing Liu, Airong Chen, Chen Zhao, Teruhiko Yoda
    Abstract:

    The mechanical behavior of the support regions for continuous composite girders with tensile stresses in the concrete slab and compressive stresses in the lower steel profile becomes strongly nonlinear under negative bending Moments. A static test on four half-scale model of a steel and concrete composite girders with different shear connectors including studs and PBL under Hogging Moments was conducted and observed to evaluate the influence of shear connector on inelastic behavior such as flexural stiffness reduction, crack initiation and development in concrete slab. From the test results, the flexural stiffness and loading capacity of the composite girders were improved by PBL shear connector. Higher initial cracking load and crack resistance stiffness of composite girders with PBL shear connector under serviceability limit state was obtained during crack development process. The test specimen could be assumed as full composite section until the ultimate state from load-slip relationship of shear connector. Analytical and experimental studies can serve as a basis for continuous composite bridges design.