混凝土小型空心砌块复合墙体受弯和受剪性能试验研究

对两种连接方式(钢筋连接和钢丝网片连接)的混凝土小型空心砌块足尺复合墙体交替进行了平面内低周反复加载试验和先外后内低周反复加载试验(即平面外加载试验完成后再进行平面内加载试验),旨在了解复合墙体的开裂和裂缝发展过程以及墙体连接筋的应变变化,研究墙体的抗震性能和变形能力。平面外低周反复加载试验结果表明,两种连接方式复合墙体的延性性能几乎相同,钢丝网片连接能更好地增加墙体的整体性和平面外抗震性能。文中比较了复合墙体在平面外加载试验的基础上进行平面内加载与直接进行平面内加载试验结果的差异,对试验结果的分析表明,平面外加载试验后墙体裂缝的存在降低了墙体的刚度,故而再进行平面内加载试验时墙体的开裂荷载有所降低,但对极限荷载、墙体延性及耗能均无明显影响。

Experimental study on shear and bending resistance of small-size concrete block cavity walls

Out-of-plane under lateral low cyclic loading test and in-plane loading test on two kinds of small concrete hollow block composite walls with different joint fashion are carried out in order to know the cracking and the developing process of the crack,to analyze the strain change of the joint bar and to research the seismic and deformation behavior.The result of out-of-plane loading tests shows that the ductility of these two kinds of walls is about the same,the wall jointed with bar can improve the entirety of composite walls and the wall jointed with steel wire netting is better at increasing tension strength of the attachment wall.The paper compares the wall under the in-plane loading after out-of-plane loading with the wall under in-plane loading only,the result shows that the out-of-plane loading weakens the rigidity of the wall,and the crack-loading debases,but the ultimate carrying capacity and ductility change little.