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针对砖砌体结构抗震性能差的问题,提出了采用竖向无粘结预应力筋对砖砌体结构进行加固的新型抗震加固技术。为研究加固效果,进行了一栋两层足尺砖砌体房屋模型模拟地震作用的拟动力试验与拟静力试验研究。试验测试了模型结构的动力特性和在不同方向、不同量级拟动力地震作用下的位移反应,研究了在拟静力试验工况下的破坏形态和受力性能。结果表明,加固前设防烈度不足8度的砖砌体结构,加固后在相当于9度大震(620伽)的拟动力作用下基本处于弹性状态,且结构两个方向的抗剪承载力与房屋总重量之比分别达到1.24和1.41,抗震承载力显著提高。加固后结构的荷载-位移滞回环饱满,骨架曲线下降段平缓,表现出良好的耗能和变形能力。水平荷载卸除后,预应力筋对于房屋有明显的复位作用,有助于实现大震不倒。
Aiming at the problem of poor seismic performance of brick masonry structure, a new seismic strengthening technology is proposed to reinforce the brick masonry structure with vertical unbonded tendons. In order to study the reinforcement effect, a pseudo-dynamic test and a pseudo-static test of a two-story full-scale masonry building model to simulate the earthquake action are carried out. The dynamic characteristics of the model structure and the displacement responses under different magnitude and magnitude of quasi-dynamic earthquakes are tested and the failure modes and mechanical properties under quasi-static test conditions are studied. The results show that the brick masonry structure with less than 8 degree fortification strength before reinforcement is basically in elastic state under the pseudo-dynamic equivalent of 9 degree earthquake (620 G) after reinforcement, and the shear capacity in both directions The ratio of the total house weight reached 1.24 and 1.41 respectively, and the bearing capacity of earthquake-resistant buildings increased significantly. After the reinforcement, the load-displacement hysteresis loop is full and the descending section of the skeleton curve is gentle, showing good energy dissipation and deformation capacity. After the horizontal load is removed, the prestressing tendons have obvious resetting effect on the houses, which will help to prevent the great earthquake from going down.