预应力钢板带加固砖砌体墙抗震性能试验研究  

Experimental Investigation on Seismic Performance of Brick Masonry Walls Strengthened by Prestressed Steel Strips

作　　者：敬登虎[1] 乔墩 邢凯丽 JING Denghu;QIAO Dun;XING Kaili(School of Civil Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学土木工程学院,江苏南京211189

出　　处：《湖南大学学报（自然科学版）》2021年第7期19-27,共9页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51008070);江苏省自然科学基金资助项目(BK20171361)。

摘　　要：为了改善正交钢板带加固砖砌体墙的应力滞后问题,提出在横向钢板带中施加预拉应力,并进行了5片墙体的低周往复荷载试验,得到试件的破坏过程,分析其滞回曲线、骨架曲线、承载力、刚度和延性.结果表明:预应力钢板带加固砖砌体墙能够有效地提高其抗震性能;横向钢板带中的预应力水平在适当范围内提高时,能进一步提高试件的承载力,且对开裂点抗侧刚度几乎无影响,但延性有所下降;提高墙体的负荷水平,试件的承载力和抗侧刚度均增加,延性有小幅下降;当墙体的高宽比提高至1时,加固效果相对较差.此外,基于横向钢板带中应变发展规律的分析,可以发现施加预应力能有效提高材料的利用率.最后,给出了预应力控制的建议值和抗剪承载力计算公式.In order to improve the stress lag problem when using orthogonal steel strips to strengthen brick masonry walls,it is proposed to apply pre-tension stress to horizontal steel strips.Five specimens were tested under low reversed cyclic loading.The failure process of the specimen was described,and the hysteretic curve,skeleton curve,bearing capacity,stiffness and ductility were also analyzed.The results show that strengthening brick masonry wall by pre-stressed steel strips can improve its seismic performance;increasing the steel strips’pre-stress level within the appropriate range can further improve the bearing capacity of the specimen,and has little effect on the lateral stiffness corresponding to its cracking point,but the ductility decreases slightly;increasing the Vertical load level of the wall can improve both the bearing capacity and lateral stiffness of the specimen,but the ductility also decreases slightly;and increasing the aspect ratio of the wall to 1,the strengthening effect is relatively worse.Furthermore,based on the analysis of the strain development of steel strips,it can be found that pre-stress application can effectively improve the utilization ratio of the material.Finally,the recommended value of pre-stress and calculating formula of shear capacity were proposed.

关 键 词：砖砌体墙 钢板带 预应力 抗震加固 滞回曲线 

分 类 号：TU364[建筑科学—结构工程]