楼板参与作用对RC框架结构抗倒塌能力影响  

Effects of floor slab on the collapse-resistance capacity of RC frame structures

作　　者：左琼[1] 白雪霜[1] 王亚勇[1] 

机构地区：[1]中国建筑科学研究院,北京100013

出　　处：《建筑结构》2013年第1期37-40,共4页Building Structure

摘　　要：通过Pushover方法,评估了楼板参与作用对RC框架结构整体承载力和变形能力的影响。结果表明,由于楼板增加了梁柱线刚度比及梁的受压区面积,这一抗弯刚度贡献提高了结构的超强系数和延性系数。"超配"的板筋虽有利于提高结构的超强系数,但降低了结构的变形能力。因此,在进行框架梁设计时,应恰当地考虑楼板的刚度贡献及减小有效翼缘宽度内板筋的作用,以使结构获得更好的抗倒塌能力。Pushover analysis was performed to investigate the effects of floor slab on the integrity strength and deformation capacity of RC frame structures.The results show that,owing to the contribution of floor slab to the beam bending stiffness including the augment of line stiffness ratio of beam and column and the flexural pressure areas of beam,over strength factor and ductility ratio of the structure are improved.Despite the fact that additional reinforcement in slab appreciably advances over strength factor of the structure,ductility of the structure gets worse.Consequently,while designing frame beam,the amplification of beam bending stiffness due to slab should be appropriately taken into account and the additional contribution of the distributed reinforcement along the beam in the effective width of slab should be reduced,so that the structure can attain better collapse-resistance capacity.

关 键 词：抗倒塌 有效翼缘宽度 梁柱线刚度比 RC框架结构 

分 类 号：TU312[建筑科学—结构工程]