砖砌体结构耐久性劣化与加固修复的抗震性能试验研究  

Experimental study on seismic performance of brick masonry structure durability deterioration and reinforcement repair

作　　者：高润东 张永群 李向民 GAO Rundong;ZHANG Yongqun;LI Xiangmin(Shanghai Key Laboratory of Engineering Structure Safety,Shanghai Research Institute of Building Sciences Co.,Ltd,Shanghai 200032,China)

机构地区：[1]上海市建筑科学研究院有限公司上海市工程结构安全重点实验室,上海200032

出　　处：《建筑结构》2024年第16期151-158,共8页Building Structure

基　　金：国家重点研发计划(2017YFC0702900);上海市青年科技启明星计划(20QB1404700);上海市科学技术委员会科研计划项目(22DZ1203600)。

摘　　要：为了研究受侵蚀砖砌体结构的抗震性能,设计并制作了3片砖墙试件,分析了砖墙在硫酸钠和硫酸镁侵蚀溶液复合作用下的表观损伤情况和抗震性能。同时,为了研究既有加固方法对受侵蚀砖墙的适用性,采用了钢丝网⁃普通水泥砂浆面层和高延性水泥基复合材料面层加固侵蚀砖墙。最后,通过拟静力试验分析了各试件的破坏模式、滞回性能、骨架曲线、刚度退化和耗能能力。结果表明:砂浆受侵蚀后的化学产物包括石膏、钙矾石和水化硅酸镁,砖墙表面形成Na_(2)SO_(4)结晶。受侵蚀砖墙的抗震性能与普通砖墙相比有一定的劣化,侵蚀180d后其承载力约是普通砖墙的90%。采用钢丝网⁃普通水泥砂浆面层和高延性水泥基复合材料面层加固方法可显著提高砖墙的抗震性能。加固受侵蚀砖墙时,应采用可靠的连接方式保证加固层与砖墙协同工作。In order to study the seismic performance of the eroded brick masonry structure,three brick wall specimens were designed and fabricated,and the apparent damage and seismic performance of the brick wall under the combined action of Na2SO4 and MgSO4 erosion solution were analyzed.At the same time,in order to study the applicability of the existing reinforcement methods to the eroded brick wall,the steel mesh⁃ordinary cement mortar surface layer and high ductility cement matrix composite surface layer were used to reinforce the eroded brick wall.Finally,the failure mode,hysteretic behavior,skeleton curve,stiffness degradation and energy dissipation capacity of each specimen were analyzed by quasi⁃static test.The results show that the chemical products of mortar after erosion include gypsum,ettringite and hydrated magnesium silicate,and Na_(2)SO_(4) crystal is formed on the surface of brick wall.The seismic performance of the eroded brick wall is worse than that of the ordinary brick wall,and its bearing capacity is about 90%of that of the ordinary brick wall after 180 days of erosion.The seismic performance of brick walls can be significantly improved by using steel mesh⁃ordinary cement mortar surface layer and high ductility cement matrix composite surface layer reinforcement method.When reinforcing the eroded brick wall,a reliable connection method should be used to ensure that the reinforcement layer and the brick wall work together.

关 键 词：砌体结构 耐久性劣化 加固修复 抗震性能 

分 类 号：TU362[建筑科学—结构工程]