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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。
The vertical static loading test was carried out on two specimens of whole cast-in-situ concrete slabs, and by comparing with non-slab beam specimens and plane truncated beams specimens and nonlinear finite element analysis, Effect of Spatial Effect of Slab Casting on Behavior of Beams under Action. The results of nonlinear finite element analysis basically agree with the experimental results. The experimental and analytical results show that there are torsion cracks in the cross-beams of the side supports of the space beam specimens, and the cracks in the slab are obliquely distributed. The cross-section of the beam-side supports and the cross-section beams and plates in the orthogonal directions all have certain bending moments. There was a clear space force transmission line for the beam specimen; the plastic hinge appeared first in the beam span of the space beam specimen, and before the plastic hinge appeared in the bearing section, concrete crushing or bearing occurred in the compression zone of beam bearing section Near the shear failure, this failure mode is basically the same as that of the plane truncated beam plate specimen, but completely different from the failure mode of the beam specimen without the plate plate; the space effect of the fully cast beam plate greatly improves the rigidity and bearing capacity of the beam ability.