木丝水泥填充墙-RC框架抗震性能试验研究

Experimental study on seismic performance of wood fiber cement infilled wall⁃RC frame

为研究木丝水泥填充墙-钢筋混凝土(RC)框架的抗震性能和破坏机理,共制作五个试件进行低周反复试验,其中一个试件为普通砖填充墙-RC框架对比试件,两个试件为开窗洞的木丝水泥填充墙-RC框架,另外两个试件为添加玻璃纤维网格布的木丝水泥填充墙-RC框架,并分析试件的滞回曲线、骨架曲线、延性系数、耗能情况与刚度退化等指标。试验结果表明,木丝水泥填充墙-RC框架的抗震性能良好,刚度退化速度远小于普通砖填充墙-RC框架,耗能能力在试件开裂后超过普通砖填充墙-RC框架;在木丝水泥填充墙-RC框架上开窗洞后会削弱其承载力,但破坏时裂缝只是沿四个窗角分别向四个填充墙角扩展,最终形成“X”形裂缝,而木丝水泥填充墙-RC框架与混凝土之间的粘结面未被破坏,在木丝水泥填充墙-RC框架表面加入玻璃纤维网格布后可以减少墙面裂纹的产生,且提高了极限承载力和延性系数,并抑制了刚度的快速下降。

In order to study the seismic performance and failure mechanism of wood fiber cement infilled wall-reinforced concrete(RC)frame,a total of five specimens were made for low-cycle repeated tests.One of the specimens was a common brick infilled wall-RC frame as comparison specimen,two specimens were wood fiber cement infilled wall-RC frame with window openings,and the other two specimens were wood fiber cement infilled wall-RC frame with glass fiber grid cloth.The hysteresis curve,skeleton curve,ductility coefficient,energy dissipation and stiffness degradation of the specimens were analyzed.The test results show that the seismic performance of the wood fiber cement infilled wall-RC frame is good,the stiffness degradation rate is much smaller than that of the common brick infilled wall-RC frame,and the energy dissipation capacity is higher than that of the common brick infilled wall-RC frame after the specimen is cracked.The bearing capacity of the wood fiber cement infilled wall-RC frame will be weakened after opening the window,but the crack will only expand along the four window corners to the four filling wall corners,and finally form the X-shaped crack.The bonding surface between the wood fiber cement infilled wall-RC frame and the concrete is not destroyed.Adding glass fiber grid cloth to the surface of the wood fiber cement infilled wall-RC frame can reduce the generation of wall cracks,improve the ultimate bearing capacity and ductility coefficient,and inhibit the rapid decline of stiffness.