无筋砖墙外加预应力斜拉杆加固抗震试验研究  

Quasi-static test of unreinforced brick walls strengthened with external prestressed diagonal ties

作　　者：刘航[1] 李宗峰 崔宏剑[1] 韩明杰[1] 田玉基[2] Liu Hang;Li Zong-feng;Cui Hong-jian;Han Ming-jie;Tian Yu-ji(Beijing Building Construction Research Institute Co.Ltd,Beijing 100039,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京市建筑工程研究院有限责任公司,北京100039 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《工程抗震与加固改造》2021年第6期108-116,102,共10页Earthquake Resistant Engineering and Retrofitting

基　　金：北京市自然科学基金(8202023)。

摘　　要：针对无筋砖砌体结构抗震性能差的问题,提出了采用外加预应力斜拉杆对砖墙进行抗震加固的新方法。即在被加固墙体两侧沿对角线方向对称布置钢拉杆并施加预应力,使墙体同时受到竖向和水平预压作用。竖向预压作用提高了墙体所受正应力,从而可提高其抗震受剪承载力,水平预压作用可以起到水平钢拉杆的作用,提高结构的整体性;同时,斜向布置的预应力筋还可以直接抗剪,从而进一步提高墙体的抗震受剪承载力。为验证该方法的加固效果,进行了3片无筋砖墙在水平低周反复荷载下的全过程试验研究,其中1片砖墙为未加固墙体,2片砖墙为加固墙体。对比分析了未加固墙体与加固墙体的破坏形态和受力特点。试验结果表明,采用预应力斜拉杆加固后,砖砌体墙体的抗震受剪承载力和变形能力均大幅度提高,抗震耗能能力显著增强。The seismic retrofitting method of clay brick masonry structure using external prestressed diagonal ties is presented to be directed against the poor seismic performance of the structure.By arranging the diagonal tendons along the wall and applying prestress, the brick wall is under vertical and horizontal pre-compression. The compression stress is improved due to the vertical pre-compression, thus the seismic shear capacity can be improved and the integrity of the structure can be improved due to the horizontal pre-compression. Besides, the shear capacity of the wall can also be contributed by the inclined tendons. The effectiveness of this method is investigated experimentally through quasi-static reversed cyclic loading test of 3 unreinforced masonry walls, including 1 non-retrofitted walls for comparison and 2 retrofitted walls. The mechanical behaviors and the failure patterns of the non-retrofitted wall and the retrofitted walls are compared and analyzed. The results show that the seismic shear capacity and the deformation ability of the retrofitted walls can be improved in a large scale and the seismic energy dissipating ability is also significantly increased.

关 键 词：无筋砖墙 预应力斜拉杆 抗震加固 水平低周反复荷载试验 受剪承载力 延性 

分 类 号：TU362.02[建筑科学—结构工程] TU317.1