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Milan Veljkovic - One of the best experts on this subject based on the ideXlab platform.

  • Requirements for oversized holes for reusable steel-concrete Composite Floor systems
    Structures, 2020
    Co-Authors: Martin Nijgh, Milan Veljkovic
    Abstract:

    The design of sustainable structures is increasingly gaining attention in the construction sector as a societal and technological challenge. Demountability and reuse of structures contributes to the reduction of the environmental impact of the built environment. Welded headed studs used in traditional steel-concrete Composite Floor systems need to be replaced by demountable shear connectors to enable the transition of the construction sector to a circular business model. The demountable shear connectors are embedded in large prefabricated concrete Floor elements and connected to steel beams by bolts. The holes in the beam flange are oversized to account for geometrical and dimensional deviations of all members and to facilitate rapid execution and easy demounting. The goal of this paper is to present a methodology that quantifies the required nominal hole clearance for reusable Composite Floor systems. Statistical characteristics of dimensional and geometrical deviations serve as input for Monte-Carlo simulations. The aggregated results of the Monte Carlo simulations are used to determine the required nominal hole clearance for a specified probability of successful installation of the demountable shear connectors. The proposed methodology is applied to the Composite Floor system of a demountable and reusable car park building. The contradicting requirement of oversized holes and Composite interaction is solved by injecting the hole clearance with a (steel-reinforced) epoxy resin. The bearing resistance of the (steel-reinforced) epoxy resin is addressed based on preliminary results of creep experiments on resin-injected bolted connections.

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

  • numerical study on steel concrete Composite Floor systems under corner column removal scenario
    Structures, 2019
    Co-Authors: Kang Hai Tan
    Abstract:

    Abstract In this paper, the authors assess the robustness of steel-concrete Composite Floor systems subjected to a Corner Column (CC) removal scenario based on numerical simulations. First, a modelling method is verified by previous actual test results conducted by the authors. Afterwards, using the reliable modelling method a Composite Floor system subjected to a corner column loss is simulated, producing the static load-displacement curve, the failure mode and load-transfer mechanisms. These results are compared with those of Composite Floor systems under an Internal Column (IC) removal scenario. Besides, the model is applied to simulate that the same Composite Floor system experiences a sudden column removal under six levels of loads. The dynamic displacement-time histories under all levels of loads are obtained, from which the loads and corresponding maximum deflections constitute the dynamic load-deflection response. They are used to evaluate the dynamic load capacity and deformability of this Composite Floor system subjected to a sudden CC removal scenario. Lastly, Dynamic Increase Factors (DIFs) are obtained through comparing the dynamic load-deflection response with the quasi-static one, which are further compared with DIFs under IC scenario.

  • Parametric effects on Composite Floor systems under column removal scenario
    Engineering Structures, 2019
    Co-Authors: Kang Hai Tan
    Abstract:

    Abstract This paper presents parametric studies on three-dimensional steel-frame-Composite-Floor systems (3D Composite Floor systems) subjected to column loss using macro-based finite element (FE) models and a verified analytical method. The FE modelling method is verified by four actual experimental tests with three important variables, viz. slab aspect ratio, boundary condition and degree of Composite action between Composite slabs and steel beams. To overcome the shortage of data acquisition in the actual Composite Floor system tests, the FE models can be used to investigate the effects of these variables on load-resisting mechanisms, such as flexure and catenary action in the double-span girder and the double-span beam over the missing column, and flexure and tensile membrane action in Composite slabs. In addition, the parametric studies are extended to include slab thickness. In a similar manner, the analytical model is used to study the effects of slab aspect ratio and joint type on robustness of 3D Composite Floor systems. After evaluating the robustness of eight sub-structures with different combinations of extended-end-plate, flush-end-plate, web-cleat and fin-plate joints, a few combinations are recommended. Lastly, consistency between FE simulations and the analytical predictions is confirmed through a comparison of energy stored in different structural members.

  • numerical study on steel concrete Composite Floor systems under corner column removal scenario
    Proceedings of the 12th International Conference on Advances in Steel-Concrete Composite Structures. ASCCS 2018, 2018
    Co-Authors: Kang Hai Tan
    Abstract:

    This paper evaluates the robustness of steel-concrete Composite Floor systems subjected to Corner Column (CC) removal scenario based on numerical simulations. Firstly, a FE model is statically analysed subjected to a CC removal scenario, yielding the static load-displacement curve, the failure mode and load-transfer mechanisms. These results are compared with those of Composite Floor systems under an Internal Column (IC) removal scenario. Besides, the FE model was dynamically analysed by six times under the respective six levels of loads by suddenly removing the corner column. The dynamic displacement-time responses under all levels of loads were obtained. Six pairs of load versus peak displacement constitute the pseudo-static response, to assess the load-carrying capacity and ductility of this Composite Floor system subjected to a sudden corner-column-removal scenario. Lastly, dynamic increase factors (DIFs) are obtained through comparing the quasi-static and pseudo-static responses, which is further compared with DIF under IC scenario.

  • Three-Dimensional Composite Floor Systems under Column-Removal Scenarios
    Journal of Structural Engineering, 2018
    Co-Authors: Kang Hai Tan, Xuhong Zhou, Bo Yang
    Abstract:

    AbstractIn this study, four 1/3-scaled enhanced steel frame–Composite Floor specimens were tested quasi-statically under a column-removal scenario. One specimen was the control test and the other t...

  • load resisting mechanisms of 3d Composite Floor systems under internal column removal scenario
    Engineering Structures, 2017
    Co-Authors: Kang Hai Tan, Xuhong Zhou, Bo Yang
    Abstract:

    Abstract To elucidate the load-resisting mechanisms of three-dimensional steel-frame-Composite-Floor systems (3D Composite Floor systems) under internal column removal scenario, such as tensile membrane action and catenary action, a large-scale experimental test was conducted. A two-by-two bay specimen was tested quasi-statically to failure by using a special loading and restraint system. The test specimen was scaled down from a prototype structure to a 1/3 model due to laboratory space constraint. Based on this test, the load-deflection response of the 3D Composite Floor subjected to internal column loss is obtained. Besides, the peak load-carrying and deformation capacities are obtained and the failure modes are discussed in detail. Stress states and deformation of the Floor components including steel beams and decking are also presented. To gain deeper insight into the load-resisting mechanisms, the respective contributions of individual Floor system components are separated, which include the double-span girder, double-span secondary beam and Composite slabs. Finally, the vertical load redistribution among surrounding columns is evaluated to find the load transfer path at large deformation stage.

Larry A Fahnestock - One of the best experts on this subject based on the ideXlab platform.

  • experimental behavior of a half scale steel concrete Composite Floor system subjected to column removal scenarios
    Journal of Structural Engineering-asce, 2016
    Co-Authors: Eric S Johnson, Jeffrey E Meissner, Larry A Fahnestock
    Abstract:

    AbstractA half-scale three-bay by three-bay steel-concrete Composite Floor system, which represented gravity framing for a typical commercial building, was studied experimentally to evaluate its structural integrity under four separate column removal scenarios: a corner column, two edge columns, and an interior column. In each test, the load was incrementally applied in the bays that were tributary to the removed column using water in containers that were placed on top of the slab. The tests demonstrated that gravity systems for commercial buildings have a significant level of structural integrity—compared to the load redistribution capability expected for steel framing with simple shear connections—even without specific design against progressive collapse. In the corner and edge column removal scenarios, 2.9 kPa (60 psf) and 4.0 kPa (83 psf) were sustained, respectively, and these loads represent a range of 50–75% of the expected Floor load. The interior column removal scenario had an unexpectedly low ca...

Xin Tang Wang - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Study of Mechanical Property of a New Lightweight Composite Floor
    Applied Mechanics and Materials, 2014
    Co-Authors: Bing Shao, Zheng Jue Huang, Xin Tang Wang
    Abstract:

    For analysis of bearing mechanism of the Composite Floor formed with thin-walled steel and lightweight aggregate concrete, the static load test of a Composite Floor was put forward. The specimen is simply supported at the two shorter sides of the Floor and the other two sides free. The uniform loads and partial loads are applied to the Floor through load blocks. The vertical displacements of the Floor, the relative slips of concrete panels and steel beam and strains of specimens were measured and analyzed. The results showed that the new lightweight Composite Floor has better bearing capacity and there was not cracks in lightweight aggregate concrete panels while the applied loads are much larger than the normal loads. It is concluded that variation of strains of secondary beams and concrete panels has similar development trend as the equivalent uniform load is close the value of 6 kN/m2.

  • Research of Mechanical Performance of Thin-Walled Steel Lightweight Concrete Composite Floor
    Applied Mechanics and Materials, 2014
    Co-Authors: Xin Tang Wang, Zheng Jue Huang, Bing Shao
    Abstract:

    For study of mechanical performance and bearing mechanism of the fabricated Composite Floor consisting of thin-walled steel beams and lightweight aggregate concrete panels, the static load experiment of a Composite Floor was finished and presented. The specimen is simply supported at the two shorter sides and the other two longer sides free. The equivalent uniform loads are applied to the Floor through setting the load blocks on the supper surface of the Floor. The vertical displacements and strains of the specimen were measured and analyzed. The experimental results show that the new Composite Floor has greater bearing capacity and better elasticity. It is concluded that although there is combined action between the main beam and the concrete panel, there is also evident slip between top flange of the main beam and the concrete panel.

  • Experimental Research of Performance of a New Fabricated Lightweight Steel-Concrete Composite Floor
    Applied Mechanics and Materials, 2014
    Co-Authors: Xin Tang Wang, Bing Shao, Zheng Jue Huang
    Abstract:

    For study of mechanical property of a fabricated Composite Floor consisting of thin-walled steel I beams and lightweight aggregate concrete panels, the static load experiment of the new Composite Floor was presented and the results was discussed. The specimen was simply supported at the two shorter sides and the other two longer sides free. The equivalent uniform loads are applied to the Floor through setting the load blocks on the supper surface of the Floor. The vertical displacements, slips between steel beam and concrete panel and strains of the specimen were measured. It was shown that the strain at the bottom of the concrete panel is quite close to the strain at the top flange of the main beam and the strain at bottom flange of the main beam is much larger than the value at top flange.

  • Research on Fire Behaviour of a Lightweight Aggregate Concrete Composite Floor
    Advanced Materials Research, 2011
    Co-Authors: Hong Liang Sun, Xin Tang Wang, Ping Xin Sun
    Abstract:

    To study the fire performance of the profiled sheet-light aggregate concrete Composite Floor subjected to fire load, study of fire response and post-fire bearing capacity of a profiled sheet-lightweight aggregate concrete Composite Floor subjected to dead load is carried out. Based on the experimental results, the fire performance and post-fire bearing capacity of the Floor after exposure to fire are analyzed. It is shown that the failure form of the profiled sheet-ceramsite concrete Composite Floor after exposure to fire still exhibits higher bending capacity, and the ultimate value of the equivalent distributed load is up to 30.69kN/m2, which may be used as basis of strengthening and repairing of the profiled sheet-ceramsite concrete Composite Floor after exposure to fire.

  • Study of Post-Fire Behavior of a Profiled Sheet-Ceramsite Concrete Composite Floor
    Applied Mechanics and Materials, 2011
    Co-Authors: Xin Tang Wang, Ming Zhou, Ping Xin Sun
    Abstract:

    To study the post-fire behavior of the profiled sheet-ceramsite concrete Composite Floor after exposure to fire load, experimental research on post-fire bearing capacity of a profiled sheet-ceramsite concrete Composite Floor subjected to dead load, which has shearing nails, is carried out here. Based on the experimental results, the post-fire bearing capacity of the Composite Floor after exposure to fire is analyzed. It is shown that the failure form of the profiled sheet-ceramsite concrete Composite Floor after exposure to fire has obvious change compared with the Floor not subjected to fire load, but the Composite Floor subjected to fire load exhibits higher bending capacity, and the ultimate value of the equivalent distributed load is up to 30.86 kN/m2, which may be used as basis of strengthening and repairing of the profiled sheet-ceramsite concrete Composite Floor after exposure to fire.

Martin Nijgh - One of the best experts on this subject based on the ideXlab platform.

  • Requirements for oversized holes for reusable steel-concrete Composite Floor systems
    Structures, 2020
    Co-Authors: Martin Nijgh, Milan Veljkovic
    Abstract:

    The design of sustainable structures is increasingly gaining attention in the construction sector as a societal and technological challenge. Demountability and reuse of structures contributes to the reduction of the environmental impact of the built environment. Welded headed studs used in traditional steel-concrete Composite Floor systems need to be replaced by demountable shear connectors to enable the transition of the construction sector to a circular business model. The demountable shear connectors are embedded in large prefabricated concrete Floor elements and connected to steel beams by bolts. The holes in the beam flange are oversized to account for geometrical and dimensional deviations of all members and to facilitate rapid execution and easy demounting. The goal of this paper is to present a methodology that quantifies the required nominal hole clearance for reusable Composite Floor systems. Statistical characteristics of dimensional and geometrical deviations serve as input for Monte-Carlo simulations. The aggregated results of the Monte Carlo simulations are used to determine the required nominal hole clearance for a specified probability of successful installation of the demountable shear connectors. The proposed methodology is applied to the Composite Floor system of a demountable and reusable car park building. The contradicting requirement of oversized holes and Composite interaction is solved by injecting the hole clearance with a (steel-reinforced) epoxy resin. The bearing resistance of the (steel-reinforced) epoxy resin is addressed based on preliminary results of creep experiments on resin-injected bolted connections.