钢筋混凝土梁-墙平面外连接节点试验

Experimental study of reinforced concrete non-planar beam-wall connections

为了研究钢筋混凝土梁-墙平面外连接节点的受力性能,完成了6个“强梁弱墙”型节点试件在梁端往复竖向荷载作用下的试验。试验结果表明,达到最大承载力时,梁截面比较宽的试件,墙正面的部分受拉纵向钢筋屈服,墙背面的纵向钢筋未屈服;破坏主要发生在楼板与墙连接部位以及剪力墙的正面,楼板和梁下方墙的破坏比楼板上方墙的破坏严重;墙正面的混凝土脱落、部分竖向钢筋压屈;墙背面有裂缝但不严重,裂缝主要分布在梁的周围;连接节点有比较大的变形能力;梁截面的宽和高以及楼板对承载力和耗能能力都有影响。对试件进行了非线性有限元分析,得到应力分布与试件的试验破坏现象一致。

To study the behavior of non-planar beam-wall connections, test of six connection specimens with strong beam and weak wall was conducted under cyclic loading at the beam end. Test results showed that for the specimens with large beam section width, a portion of tensile reinforcement in the front of the wall yielded, while reinforcement in the back of the wall did not yield at the peak load. Damage occurred mainly at the interface between slab and wall, and also at the front of shear wall. The shear wall underneath the slab and beam damaged seriously. Concrete flaked away and some vertical reinforcement buckled. The back of the wall cracked slightly and cracks mainly were around the beam. The specimens have large deformation capacity. The section width and height of beam and the slab have positive effects on the ultimate strength and the energy dissipation capacity of the specimens. Non-linear finite element analysis of specimens has been carried out and the stress distribution pattern obtained is consistent with the experimental results.