竖向荷载作用下整浇梁板的空间效应试验研究  

Experimental research on spatial effect of cast-in-situ beam-slab system under vertical loads

作　　者：蒋利学[1] 郑乔文[1] 

机构地区：[1]上海市建筑科学研究院,上海200032

出　　处：《建筑结构学报》2009年第S1期200-207,共8页Journal of Building Structures

基　　金：国家科技支撑计划项目(2006BAJ03A07);建设部研究开发项目(2007-K3-16)

摘　　要：对2个空间整浇梁板试件进行了竖向静力加载试验,并通过与不带板的梁试件及平面截断梁板试件的对比和非线性有限元分析,研究了竖向荷载作用下整浇梁板的空间效应对梁受力性能的影响。非线性有限元分析结果与试验结果基本吻合。试验与分析结果表明:空间梁板试件的边支座直交梁出现扭转裂缝,楼板上的裂缝多斜向分布,梁边支座截面及直交方向梁、板截面均存在一定的弯矩,空间梁板试件存在明显的空间传力路线;空间梁板试件的梁跨中先出现塑性铰,而在支座截面出现塑性铰之前,发生梁支座截面受压区混凝土压碎或支座附近剪切破坏,这种破坏模式与平面截断梁板试件基本相同,而与不带板的梁试件的破坏模式完全不同;整浇梁板的空间效应大幅度提高了梁的刚度和承载能力。Static tests of two spatial cast-in-situ beam-slab specimens under vertical loads were performed.The behaviors of beam specimen without slab and interceptive beam-slab specimen were also presented.Comparison demonstrated the influences of the spatial effect of cast-in-situ beam-slab system on mechanics behavior of beams.Nonlinear FEM analysis was performed and good agreement was observed between FEM results and testing results.Both tests and analysis reveal that: for the spatial beam-slab specimens,(1) cracks in torsion occur on the lateral beams at edge-supports,and the cracks on the slabs are distributed obliquely;(2) bending moments are developed at the sections of beam edge-supports and lateral beams and slabs,so spatial transfer mechanism is obvious;(3) the plastic hinges occur first at the mid-span sections,and before the crushing of concrete in the compressive zone or the shear failure near the supports,the plastic hinges occur at the support sections;(4) the failure mode is almost the same as that of the plane interceptive beam-slab specimen,but very different from that of the beam specimen without slab;(5)the stiffness and load carrying capacity of beams are greatly improved by the spatial effect of cast-in-situ beam-slab system.

关 键 词：整浇梁板 空间效应 静力试验 破坏模式 刚度 承载能力 

分 类 号：TU375.1[建筑科学—结构工程]