Experimental Study On Mechanical Behavior Of The Bolted-Flange-Plate Connection Of Beam-to-Shear Wall Under Cyclic Bending Moment

High-rise buildings have become a trend of urban construction, steel-concrete hybrid structures have been widely used in high-rise buildings due to their superior performance. In the steel-concrete hybrid structures, the beam-to-shear wall connections are the important parts to ensure that the steel frame and shear wall that are different in deformation behavior of structural system work together to form a whole structure. However, compared with the steel frame beam-column connections, the research progress about beam-to-shear wall connections is lagged behind and the types of connections are inadequate correspondingly. There is a certain gap between research and practical engineering applications.The Bolted-Flange-Plate connection of beam-to-shear wall is proposed on the base of previous researches and practical applications, and the mechanical behavior of the connections under moment is studied in this paper. The main work is as follow:(1).Basing on the design ideas of "strong-joint and weak-member" and practical engineering background, the thesis design and product five steel beam-concrete wall specimens that are different in connections details. The main varied parameters are the embedded parts, size and structure of the flange plate;(2).Five Bolted-Flange-Plate specimens are tested under cyclic bending moment. The failure mechanism, failure modes have been found out. The experimental results indicate that when the pulled off damage occurred at the net section of the flange plate and the steel beam flange hole, the plastic hinge is formed at the location of the beam where is far from the end of flange-Plate 1/4 height of the beam. The plastic hinge is away from the core area of connections, which meet the requirement of "strong-joint and weak-member" of seismic resistant design. For the specimen that the flange plate with dog-bone construction, flange plate occurs buckling failure firstly, and the weakened section of flange plate is pulled off. The beam flange is yielded, but the beam does not form plastic hinge when the connections have damaged. The connections with anchorage embedded parts occurs the welding damage between the anchorage and anchor plate.(3).The bearing capacity, P-Δ hysteresis curve, skeleton curve and energy dissipation capacity of connections have been analyzed in this research. The analytical results indicate that the P-A hysteresis curves are stable, but have a little pinching effect. The skeleton curves can be divided into four distinct stages:elastic stage, sliding stage, strengthening stage and the destruction stage. Increasing the cross-sectional area of flange plates can improve the bearing capacity, energy dissipation capacity of connection, and initial rotational stiffness, but has no notable effect on plastic deformation.(4).The design method of the Bolted-Flange-Plate connection of beam-to-shear wall is proposed according to the failure modes specimens. With comparison, the value of bearing capacity of the designs agrees is well with the experiments.