单面聚丙烯网聚合物砂浆加固砖砌体墙抗震性能试验研究  

Experimental study on seismic performance of brick wall strengthened with single-side polypropylene mesh-polymer mortar face

作　　者：张风亮 马东[2] 刘祖强 胡鹏春[2] 毛景琰 薛建阳 安占义[1] ZHANG Fengliang;MA Dong;LIU Zuqiang;HU Pengchun;MAO Jingyan;XUE Jianyang;AN Zhanyi(Shaanxi Institute of Architecture Science,Xi’an 710082,China;School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China)

机构地区：[1]陕西省建筑科学研究院有限公司,陕西西安710082 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《建筑结构学报》2024年第12期137-147,共11页Journal of Building Structures

基　　金：陕西省“两链”融合重点研究计划(2022LL-JB-12);陕西省建筑科学研究院科研项目(2021-11-370,2023-11-458)。

摘　　要：为提高砖砌体农房的抗震性能,考虑农房的实际情况,提出了单面聚丙烯网聚合物砂浆加固砖砌体的方法,并设计了8片缩尺墙体进行拟静力试验,变化参数包括加固面层材料、加固面层厚度和砌筑砂浆强度。获得了墙体的破坏形态和水平荷载-位移曲线,分析了墙体的承载力、延性、刚度和耗能能力等抗震性能指标。结果表明:单面聚丙烯网聚合物砂浆面层加固墙体在低周反复荷载作用下的破坏形态包括剪压破坏、剪摩破坏和剪压与剪摩破坏,滞回曲线呈饱满的梭形;采用单面聚丙烯网聚合物砂浆加固后,墙体的峰值荷载、位移延性系数、初始刚度和最大能量耗散系数分别提高23%、84%、22%和151%,抗震性能得到有效改善;增大加固面层厚度和砌筑砂浆强度,加固墙体的承载力、初始刚度和耗能能力均得到提高。在试验研究的基础上,提出了单面聚丙烯网聚合物砂浆加固砖砌体墙的受剪承载力计算方法,计算结果与试验结果比值的平均值为0.99,变异系数为0.059,二者吻合较好。To improve the seismic performance of brick masonry rural building,a strengthening method using single-side polypropylene mesh-polymer mortar face was proposed,considering the actual application situation of rural building.Eight scaled specimens were designed and quasi-static tests were carried out.The variable parameters of the specimens included the form of the strengthening face,the thickness of the strengthening face and the strength of the masonry mortar.The failure patterns and horizontal load-displacement curves of the specimens were obtained.The bearing capacity,ductility,stiffness and energy dissipation capacity of the specimens were analyzed.It is shown that the failure patterns of brick walls strengthened with a single-side polypropylene mesh-mortar face under low cyclic reversed loads include shear-compression failure,shear-friction failure,and a combination of shear-compression and shear-friction failure,with the hysteretic curves being full fusiform.After strengthening with the single-side polypropylene mesh-mortar face,the peak load,displacement ductility coefficient,initial stiffness and maximum energy dissipation coefficient of the brick wall increase by 23%,84%,22%and 151%,respectively,indicating an effective improvement in the seismic performance of the brick wall.As the thickness of the strengthening face and the strength of the masonry mortar increase,the bearing capacity,initial stiffness and energy dissipation capacity of the strengthened brick wall show improvement.Based on the experimental study,a calculation method of the shear capacity for brick wall strengthened with a single-side polypropylene mesh-polymer mortar face was put forward,and average ratio between the calculation results and the experimental results is 0.99 and the variation coefficient is 0.059,indicating that the calculation results and the experimental results agree well.

关 键 词：砖砌墙体 聚丙烯网 抗震加固 拟静力试验 受剪承载力 

分 类 号：TU362[建筑科学—结构工程] TU317.1