干栏式房屋梁柱式砖柱木梁框架抗震加固试验研究

Experimental research on seismic retrofitting properties of brick wood frame structure

在对云南省少数民族地区新兴的砖柱干栏式房屋进行调研后,发现其抗震性能较差,采用外包角钢加固和碳纤维布加固两种加固方式分别对单层单跨梁柱式砖柱木梁框架进行加固,并对加固后的框架进行低周反复加载试验。研究了不同加固方式对框架的破坏形态、承载力、荷载位移滞回曲线和刚度退化及延性、骨架曲线的影响。试验结果表明:在试验水平力作用下,框架的主要破坏形态为砖柱根部灰缝的弯拉破坏,砖柱木梁节点处无明显破坏特征;分别采用外包角钢和碳纤维布加固框架,均能有效地提高框架的抗剪承载力和耗能能力;外包角钢加固方式对框架承载力和延性方面的提高幅度都要高于碳纤维布加固方式。研究结果为砖柱干栏式房屋的抗震加固提供了参考和依据。

It is found that the seismic performance of the newly emerging stilt style houses in minority areas of Yunnan is poor. Two strengthening methods,reinforcement of outsourced angle steel and reinforcement of CFRP,are used to reinforce the single span beamcolumn type brick-wood frame. Then the low cyclic loading tests of the reinforced frames are carried out. The failure modes,bearing capacity,load displacement hysteretic curves,stiffness degradation and ductility,and skeleton curves of different reinforcement methods are studied. The influence of different ways of reinforcement on the failure modes,bearing capacity,load displacement hysteretic curves,stiffness degradation and ductility,and skeleton curves is studied. The test results show that the main failure mode of the frame is the shear failure of the root of the brick column under the effect of the experimental horizontal force,and there is no obvious damage characteristic at the joint of the brick timber beam. The shear strength and energy dissipation capacity of the frame can be effectively improved by using reinforcement of outsourced angle steel and reinforcement of CFRP. Meanwhile,the increase of the bearing capacity and ductility of the framework using reinforcement of outsourced angle steel is higher than that of the CFRP. The research results can provide reference and basis for aseismic strengthening of brick column stilt style house.