村镇既有砌体结构民居建筑抗震性能现状分析

为提高村镇砖砌体墙结构抗震性能，采用喷涂聚氨酯技术对其进行加固。设计并制作了一片未加固砌体墙与两片加固后砌体墙，进行水平低周往复加载试验，主要研究加固形式(单面喷涂及双面喷涂)对砌体墙破坏形态、滞回特性、骨架曲线、变形性能、耗能能力和刚度退化等的影响。试验结果表明：喷涂聚氨酯弹性体可有效限制墙体开裂并延缓刚度退化，显著提高墙体的变形性能及耗能能力，而对墙体承载力及刚度影响有限。相较于单面喷涂加固，双面喷涂加固可更有效限制裂缝发展，维持墙体整体性，进一步提高墙体滞回性能、变形能力及耗能能力。

Existing research on seismic behavior of masonry structure in village buildings

To efficiently and effectively enhance the seismic performance of brick masonry walls, spraying polyurethane technology is adopted. An unreinforced masonry wall and two reinforced masonry walls were designed and constructed to conduct horizontal low-cycle reverse loading tests. The effects of strengthening forms, including single-sided and double-sided spraying, on failure mode, hysteresis characteristics, backbone curves, deformation capacity, energy dissipation capacity and stiffness degradation of masonry walls were investigated experimentally. The test results show that spraying polyurethane can effectively limit crack propagation and delay stiffness degradation, significantly improve the deformation capacity and energy dissipation capacity of masonry walls, but it has limited impact on the load-bearing capacity and stiffness of walls. Compared with the single-sided spraying procedure, the double-sided spraying procedure is more effective in limiting the propagation of cracks and maintaining the integrity of the wall and further improving the hysteresis performance, deformation capacity and energy consumption capacity of the brick wall.