不同轴压比免模保温剪力墙抗震性能试验
Experiment on Seismic Performance of Non-template Insulation Shear Wall Under Varied Axial Compression Ratios

为研究不同轴压比对免模保温剪力墙平面内抗震性能及墙体协同工作性能的影响，开展了3片轴压比分别为0，0.1和0.2的免模保温剪力墙结构模型的拟静力试验；观察并记录了墙身两侧混凝土预制模块裂缝发展及分布情况，得到试件的位移延性系数、滞回曲线和骨架曲线等试验数据；综合分析各曲线和破坏形态得到了免模保温剪力墙在低周反复荷载作用下的破坏机理。结果表明：破坏过程可分为未开裂阶段、带裂缝工作阶段和破坏阶段；试验过程中3片墙体裂缝开展均匀，具有较好的协同工作性能，破坏时墙角均出现混凝土大幅压碎现象；随着轴压比的增加，预制模块的开裂荷载逐渐增加，且水平裂缝的位置逐渐靠下，极限承载力及刚度都得到提高，而延性有所降低；该研究为深入认识免模保温剪力墙的破坏模态和抗震性能提供了必要的科学依据。
In order to study the effect of varied axial compression ratios on the seismic performance and the cooperative performance of the non-template insulation shear wall, pseudo-static tests were carried out on 3 pieces of insulation shear wall with axial compression ratios of 0, 0.1 and 0.2. The development and distribution of cracks in the prefabricated concrete template on both sides of the wall were observed and recorded, and the test data such as displacement ductility coefficients, hysteresis curves and skeleton curves of the specimens were obtained. Based on the analysis of the curves and destruction modes, the failure mechanism of the non-template insulation shear wall under low cyclic loading was obtained. The results show that the failure process can be divided into three phases: uncracked, with cracks in the work and fail. The cracks in all 3 specimens develop and distribute uniformly during tests, which shows good cooperative performance, and the concrete of corner all crush substantially when the wall is broken. With the increase of the axial compression ratio, the cracking load of prefabricated concrete template increases gradually, and the position of the horizontal crack is gradually shifted downwards, the ultimate bearing capacity and stiffness increase while the ductility decreases. The study provides necessary scientific basis for further investigation on the failure mode and seismic performance of non-template insulation shear wall