二层钢框架—组合楼板体系抗倒塌试验研究

框架梁设计时按组合梁考虑混凝土楼板刚度,设计2层钢框架—组合楼板结构体系,采用卷扬机对拟失效柱突然施加水平力将其从体系中"去除",进行抗倒塌试验研究剩余结构抗倒塌性能.试验结果表明:由于组合楼板的加强作用,试验框架具有较高的冗余度,组合楼板和框架梁共同作用,提供了较高的抗弯刚度,使得框架柱失效后形成新的荷载路径,各构件未发生继发性破坏.由此可见,采用组合楼板时,按现行规范进行设计的框架结构具有较高的冗余度,混凝土楼板在框架结构抗倒塌性能分析中的作用需要进一步评估.

Experimental Study on Progressive Collapse Resistance of Two storey Steel Moment frame with Composite Slabs

A progressive collapse resistance experiment was made of a two storey steel frame. The composite concrete slab was adopted and the action of the concrete slab was considered according to the theory of the composite beam during the design process. In order to simulate the instantaneous failure of the column, the horizontal force was implemented suddenly to the top of the column through a hoisting machine. Experimental results show that the test frame has enough redundancy because of the streghtening of the composite slabs. The composite beams have the higher flexure stiffiness because the composite slabs and steel beams work together through the shear studs on the top flanges. The columns and beams of the remainder structure do not fail further after the instaneous column removal due to the formation of the alternative load path. It is indicated that the steel frame with composite slabs has the higher redundancy and horizontal tie forces according to the present design method. The action of concrete slabs needs a reevaluation in the analysis of progressive collapse resistance.