砖墙论文钢筋网水泥砂浆面层加固砖墙受剪承载力计算方法.doc

砖墙论文：钢筋网水泥砂浆面层加固砖墙受剪承载力计算方法 【中文摘要】我国存在大量的砌体结构房屋,大量震害表明,砖砌体房屋若不经合理的抗震设计,其整体性和抗震性能相对较差。目前,全球正进入新的地震活跃期,我国是多地震国家,研究砖砌体结构加固设计理论,为砖砌体结构房屋进行抗震加固提供理论支撑,具有重要意义。钢筋网水泥砂浆面层加固法是常用的砖墙加固技术之一,对钢筋网水泥砂浆面层加固砖墙受剪承载力已有一些试验研究,并根据试验提出了该技术加固砖墙受剪承载力计算方法,但计算方法中未能考虑轴压比,高宽比等因素对加固后墙体受剪承载力的影响,且加固前砖墙抗剪强度计算公式未考虑高宽比的影响。同时,所建立的受剪承载力计算公式是以砖墙用钢筋网水泥砂浆面层加固后施加竖向和水平荷载的试验结果为依据的。而实际工程中???砌体在加固前已承受竖向荷载,加固墙体的钢筋网水泥砂浆面层在使用阶段基本未承受竖向压力,只是在水平荷载作用下与原砖墙共同受力。本文采用有限元软件ABAQUS分析了已有六片砖墙拟静力试验,分析结果与试验结果吻合较好,表明该软件及所选砖砌体本构关系可用于分析砖墙的抗震性能。分析了高宽比为0.4~2.5,轴压比为0.1~0.8的砖墙,采用配筋率为0.0%~0.5%,水泥砂浆强度等级为M5~M15的钢筋网水泥砂浆面层加固前后受剪承载力。加固前砖墙抗剪强度随高宽比增加而降低,随轴压比增加而先增后减,在轴压比为0.6左右时达到峰值强度。轴压比介于0.1~0.2时,加固后墙体受剪承载力增量随高宽比增加而先增后减,在高宽比为0.8时达最大值;轴压比介于0.3~0.8时,加固后墙体受剪承载力增量在高宽比介于0.4~0.6时随高宽比增加而增加,高宽比介于0.6~2.5时增量基本不受高宽比影响;加固后墙体受剪承载力增量随轴压比的增大而先减后增,并在轴压比为0.3时达最小。加固后墙体受剪承载力增量与面层砂浆强度等级值的算术平方根、面层配筋率呈线性递增关系。原砖墙轴压比对本文所研究加固墙体的破坏模式有直接影响,在轴压比介于0.1~0.8时,面层砂浆提供的受剪承载力随原砖墙轴压比的增加而线性增加,钢筋网提供的受剪承载力随原砖墙轴压比的增加呈下凹形抛物线变化。基于分析结果,提出了考虑高宽比和轴压比影响的砖墙抗剪强度计算方法,以及考虑高宽比、原砖墙轴压比、面层配筋率及面层砂浆强度等级影响的钢筋网水泥砂浆面层加固砖墙受剪承载力计算方法,给出了钢筋网水泥砂浆面层加固砖墙的构造措施。 【英文摘要】There are large numbers of masonry buildings in China. It has been proved by huge amount of earthquake damage that masonry buildings which have not been reasonably designed for seismic loads have poor structure integrity and seismic performance. As the earth is currently entering another seismic active period and China is a country where earthquake frequently happens, it is of great significance to investigate theory for the design of seismic strengthening of masonry structures and provide theoretical support for seismic retrofitting of brick masonry structures.Strengthening with reinforced mortar layers is one of the most widely used conventional retrofitting techniques for brick masonry walls. There have been some experimental studies completed, and the methods to calculate the shear capacity of brick walls strengthened with reinforced mortar layers have been proposed based on the e