组合深梁低周反复荷载试验研究

Experimental study on composite deep beam under low cyclic loads

组合深梁作为一种新型的耗能构件,可以实现宽范围的刚度渐变调幅。通过两片跨高比分别为2.0和1.0的组合深梁低周反复荷载试验,研究了其破坏过程和破坏机理,得到了深梁的滞回曲线、承载力及承载力退化系数、延性系数和能量耗散系数。研究结果表明:组合深梁随着跨高比从2.0减小到1.0,承载力增加了190%;采用混凝土板限制钢板的平面外屈曲,可以充分利用钢材的性能;钢-混凝土组合深梁是一种理想的水平抗侧力构件。

As an innovative lateral energy-dissipation system,composite deep beams used in structural frames can achieve a wide range of stiffness adjustment.The tests were conducted on two composite deep beam specimens of onethird of full scale,which subjected to cyclic horizontal loads.These tests provided data on a detailed performance of the walls that formed the basis for the investigation on the lateral stiffness,ductility,energy absorption,load versus displacement envelope and hysteretic characteristics.The results show that the lateral resisting capacity of this type system can be increased 190% as the span-to-depth ratio changed from 2.0 to 1.0.The Experimental results also show that the structure has significant ductility and energy dissipation ability.Lateral pre-cast reinforced concrete plate can stop the buckling of steel plate to make full use of the materials.The composite deep beam can be an effective lateral load resisting element.