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Jun Shang Kuang - One of the best experts on this subject based on the ideXlab platform.

  • predicting shear strength of rc interior beam column joints by modified rotating angle softened truss model
    Computers & Structures, 2014
    Co-Authors: H F Wong, Jun Shang Kuang
    Abstract:

    A theoretical model is presented for analysing the shear behaviour and predicting the shear strength of reinforced concrete (RC) interior Beam-Column joints. The model presented is referred to as the modified rotating-angle softened-truss model (MRA-STM), which is modified from the rotating-angle softened-truss model and the modified compression field theory. In the proposed methodology, the RC interior joint is treated as an RC shear panel that is subjected to vertical and horizontal shear stresses transferred from adjacent columns and beams. Employing the deep beam analogy, the characteristic strut and truss actions typical in Beam-Column joints are represented by the effective transverse compression stresses and the softened concrete truss in the model. Sixteen RC interior Beam-Column joints were subsequently analysed with the proposed model. Shear strengths of the RC interior Beam-Column joints predicted by the proposed model show very good agreement with the experimental results.

  • predicting shear strength of rc exterior beam column joints by modified rotating angle softened truss model
    Computers and Concrete, 2011
    Co-Authors: Simon H F Wong, Jun Shang Kuang
    Abstract:

    A theoretical model known as the modified rotating-angle softened-truss model (MRA-STM), which is a modification of Rotating-Angle Softened-Truss Model and Modified Compression Field Theory, is presented for the analysis of reinforced concrete membranes in shear. As an application, shear strength and behaviour of reinforced concrete exterior Beam-Column joints are analysed using the MRA-STM combining with the deep beam analogy. The joints are considered as RC panels and subjected to vertical and horizontal shear stresses from adjacent columns and beams. The strut and truss actions in a Beam-Column joint are represented by the effective transverse compression stresses and a softened concrete truss in the proposed model. The theoretical predictions of shear strength of reinforced concrete exterior Beam-Column joints from the proposed model show good agreement with the experimental results.

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

  • robustness assessment of exterior precast concrete frames under column removal scenarios
    Journal of Structural Engineering-asce, 2016
    Co-Authors: Shaobo Kang
    Abstract:

    AbstractThis paper describes an experimental investigation on the resistance and failure mode of four precast concrete frames. Each frame comprised a middle Beam-Column joint, a double-span beam, and two side columns. Two parameters, namely, reinforcement detailing in the Beam-Column joint and dimensions of the side columns, were investigated in the experimental program. Frame specimens were loaded on the middle joint by a vertical servohydraulic actuator, and corresponding horizontal reaction forces were recorded through load cells connected to the side columns. Experimental results and observations indicate that precast concrete frames were capable of developing compressive arch action (CAA) at the initial loading stage. However, frames with smaller side columns exhibited shear failure in the side joint. This hindered the development of catenary action in the bridging beam. By increasing the dimensions of the side columns, significant catenary action developed in the frames, and eventually flexural fail...

  • behaviour of precast concrete beam column sub assemblages subject to column removal
    Engineering Structures, 2015
    Co-Authors: Shaobo Kang
    Abstract:

    Abstract Under column removal scenarios, initiation of alternate load paths via adjacent bridging beams to redistribute vertical loads requires certain level of ductility and continuity in beam–column joints. Although this approach does not consider the magnitude of the blast event, it is threat-independent and offers a minimum level of robustness against column removal scenarios. This paper studies the behaviour of precast concrete sub-assemblages which comprised two precast beams and a precast column joining together by cast-in-place concrete topping above the two beams and the beam–column joint. The top longitudinal reinforcement in the structural topping of precast beams passed through the beam–column joint continuously. However, the bottom beam longitudinal reinforcement was either lap-spliced or anchored as a 90° bend within the cast-in-place joint. Due to discontinuity of bottom beam longitudinal reinforcement, the ability of such an assemblage to develop compressive arch action (CAA) and subsequent catenary action has to be investigated, in particular, the effect of the top and bottom beam longitudinal reinforcement ratios. Test results show that significant CAA and catenary action developed in the beams under column removal scenarios, with pull-out failure of the bottom beam reinforcement in the joint. The enhancement of CAA and catenary action to structural resistance greatly depends on joint detailing and beam reinforcement ratio. Furthermore, the effectiveness of horizontal shear transfer between concretes cast at different times is examined at large deformation stage. Finally, practical suggestions are given to enhance structural resistance of a similar type of precast concrete sub-assemblages.

H F Wong - One of the best experts on this subject based on the ideXlab platform.

  • predicting shear strength of rc interior beam column joints by modified rotating angle softened truss model
    Computers & Structures, 2014
    Co-Authors: H F Wong, Jun Shang Kuang
    Abstract:

    A theoretical model is presented for analysing the shear behaviour and predicting the shear strength of reinforced concrete (RC) interior Beam-Column joints. The model presented is referred to as the modified rotating-angle softened-truss model (MRA-STM), which is modified from the rotating-angle softened-truss model and the modified compression field theory. In the proposed methodology, the RC interior joint is treated as an RC shear panel that is subjected to vertical and horizontal shear stresses transferred from adjacent columns and beams. Employing the deep beam analogy, the characteristic strut and truss actions typical in Beam-Column joints are represented by the effective transverse compression stresses and the softened concrete truss in the model. Sixteen RC interior Beam-Column joints were subsequently analysed with the proposed model. Shear strengths of the RC interior Beam-Column joints predicted by the proposed model show very good agreement with the experimental results.

Mangesh V Joshi - One of the best experts on this subject based on the ideXlab platform.

  • frpc reinforced concrete beam column joints under cyclic excitation
    Composite Structures, 2005
    Co-Authors: Abhijit Mukherjee, Mangesh V Joshi
    Abstract:

    An investigation on the performance of reinforced concrete Beam-Column joints under cyclic loading is reported. Joints have been cast with adequate and deficient bond of reinforcements at the Beam-Column joint. FRP sheets and strips have been applied on the joints in different configurations. The columns are subjected to an axial force while the beams are subjected to a cyclic load with controlled displacement. The amplitude of displacement is increased monotonically using a dynamic actuator. The hysteretic curves of the specimens have been plotted. The energy dissipation capacity of various FRP configurations has been compared. In addition, the control specimens have been reused after testing as damaged specimens that are candidates for rehabilitation. The rehabilitation has been carried out using FRP and their performance has been compared with that of the undamaged specimens.

Pooya Alaee - One of the best experts on this subject based on the ideXlab platform.