小跨高比钢板-混凝土组合连梁抗震性能试验研究

通过7个小跨高比钢板 混凝土组合连梁试件的拟静力试验，研究了连梁跨高比、钢板配钢率以及楼板等因素对其抗震性能的影响，分析了连梁的破坏过程、破坏形态、承载能力、变形能力和耗能能力等。结果表明：相比于不考虑楼板小跨高比PRC连梁，考虑楼板小跨高比PRC连梁增大了连梁的开裂位移，显著提高了连梁的受剪承载力和耗能能力，考虑楼板连梁试件相比于不考虑楼板连梁试件受剪承载力提高了18.03%，破坏时对应的累积耗能是后者的1.66倍；连梁钢板的破坏包括梁墙交界区钢板的开裂和钢板的局部屈曲，钢板的局部屈曲可分为钢板边缘发生的受压局部屈曲和钢腹板的剪切局部屈曲；小跨高比PRC连梁试件的剪压比实测值为0.20~0.30，相应的剪压比设计值为0.39~0.59，内嵌钢板显著提高了小跨高比连梁的剪压比限值。

Experimental research on seismic behavior of plate-reinforced composite coupling beam with small span-to-depth ratio

Seven plate-reinforced composite (PRC) coupling beam specimens with small span-to-depth ratio were tested under cyclic loading. The influences of span-to-depth ratio, steel plate ratio and slab on seismic behaviors of specimens were investigated. The specimens’ failure process, failure modes, bearing capacity, deformation capacity and energy dissipation were studied. The results indicate that compared with the PRC coupling beams without slab, the PRC coupling beams with slab can increase the cracking horizontal displacement, and can significantly improve the shear capacity and energy dissipation capacity of the PRC coupling beams without slab. Compared with the PRC coupling beam specimen without slab, the shear capacity of the PRC coupling beam specimen with slab is improved by 18.03%, and the cumulative hysteretic energy of the PRC coupling beam specimen with slab at failure is improved by 66%. The failure modes of the steel plates include the fracture of the steel plates at beam-wall connection and local buckling of the steel plates. Two local buckling phenomena were observed including compression local buckling at the edges of the steel plates and shear buckling of the steel webs. The measured values of shear-compression ratio of the PRC coupling beams with small span-to-depth ratio is 0.20-0.30, and the corresponding design values of shear-compression ratio is 0.39-0.59. The embedded steel plate can significantly improve the limited values on shear-compression ratio of the coupling beams with small span-to-depth ratio.