轻质组装墙板内置钢板支撑滞回性能试验研究

Light weight assembled steel panel was proposed to improve the ductility of steel plate brace encased in panel, to avoid local punching failure of reinforced concrete panel, to inspect encased brace and to reduce the weight of the panel. Six tests on steel plate brace encased in assembled panel, which is referred to as panel buckling restrained brace (panel BRB), have been carried out to investigate the effects of constructional details, including thickness of both encased brace and panel, gaps between panel and brace, on the hysteretic behavior of the panel BRBs. The tests revealed that the light weight panel BRBs, with Q235 steel plate brace, have good ductility and energy dissipation capacity. In general, the panel BRBs before final failure show bilinear skeleton curves, and the load carrying capacities of the panel BRBs increase with increasing lateral displacement due to the effects of strain hardening and the friction between the panel and brace after yielding. The compression strength adjustment factor at the maximum drift of 1/25 is from 1.36 to 1.61. The compression strength adjustment factors within the drift of 1/25 are all less than 1.3 and the cumulative inelastic axial deformation capacity of each panel BRB is significantly larger than 200, satisfying the requirements of ANSI/AISC 341-16. The hysteretic curves of each panel BRB are stable prior to tension fracture. The assembled panels remained intact and therefore can be reused. The encased brace only developed small multiple wave flexural deformations due to appropriate gaps kept between the panel and the encased brace and hence local failure of panel was avoided. The main tubes and steel plates with bolt holes around encased brace were considered only to simplify the calculation of the Euler buckling strength of panel. The overall buckling of the panel BRBs was prevented when the restraining ratios between the Euler buckling strength of panel about the weak-axis of the plate brace, and the maximum axial strength of encased brace are within 1.15 to 2.42.