(1 军事科学院国防工程研究院， 北京 100036； 2 中国海洋大学工程学院， 青岛 266100； 3 中国建筑科学研究院有限公司， 北京 100013)

［摘要］根据汶川地震中砌体结构墙肢剪切裂缝分布情况，提出钢筋-砂浆面层交叉条带加固法，在砌体结构承重墙上最容易产生剪切裂缝的破坏面上设置250～400mm宽钢筋-砂浆面层加固条带，由交叉布置的钢筋-砂浆面层条带承担并分散墙体剪切应力，避免或减缓强震下墙体出现交叉斜裂缝。通过系列的试验建立相应的加固墙体抗剪承载力计算公式，并利用三维振动台试验验证实际加固效果，解决设置圈梁、构造柱约束砌体承载力偏低，及目前常用的砂浆面层加固法和板墙加固法加固后的墙体刚度比未加固墙体增大较多而产生结构内力重分布并导致新的薄弱部位出现等问题。试验研究表明，采用交叉条带面层加固后，结构具有较好的抗震能力，单片组合墙体的抗剪承载能力提高40%以上；加固后墙体有较好的变形能力和延性，缩尺模型位移延性系数平均值为4-0，单片墙试件位移延性系数有较大的提高，且破坏时缩尺模型的楼层层间位移角比未加固结构明显增大，墙体的破坏形态也由比较集中的X形交叉裂缝变为多条裂缝。

［关键词］砌体结构； 抗震加固； 钢筋-砂浆面层交叉条带法

中图分类号：TU318文献标识码：A文章编号：1002-848X(2019)05-0001-08

Applicational study for seismic performance of existing masonry wall reinforced by steel bar-mortar crossed strip method

Zhou Xianxiang1, Xie Wei1, Jiang Jitong2, Yang Tao3, Chen Tao3,  Chen Wei1

(1 Research Institute for National Defense Engineering of Military Sciences, Beijing 100036, China; 2 School of Engineering, Ocean University of China, Qingdao 266100, China; 3 China Academy of Building Research, Beijing 100013, China)

Abstract:According to the cracks distribution of masonry walls in Wenchuan earthquake, steel bar-mortar crossed strip method was put forward to reinforce existing masonry wall. 250～400mm wide steel bar-mortar crossed strip were constructed on the location where shearing cracks are most likely to happen on the load-bearing wall of the masonry structure, and  the shear stress of the wall was undertaken and dispersed by steel bar-mortar crossed strip, avoiding or mitigating the cross cracks in the wall under strong earthquakes. Through a series of  experiments, the corresponding formulas for calculating shear capacity of reinforced walls were established, and the actual effect of reinforcement was verified by a three-dimension shaking table test.  Slove the problem of low bearing capacity of  the existing masonry walls  reinforced by setting ring beams and tie-columns, the common method using mortar layer and concrete splint will increase stiffness and redistribute obviously internal force of the reinforced walls, then new weak spots of the building may occur. The new method, with less stiffness increasing, may avoid these cases to happen. The experimental research shows that the structure has good seismic resistance after the reinforcement of steel bar-mortar crossed strip, and the shear bearing capacity of the single-piece composite wall is improved by more than 40%; the deformation capacity and ductility of the reinforced walls are better. And the average value of displacement ductility coefficient of the scale model is 4-0, and the displacement ductility coefficient of the single-wall test piece is greatly improved. When the failure occurs, the storey displacement angles of the scale model are obviously higher than the unreinforced structure, and the failure form of the wall is changed from concentrated X cross crack to several dispersed cracks.

Keywords:masonry structure; seismic reinforcement; steel bar-mortar crossed strip method

作者简介：周献祥，硕士，高级工程师，一级注册结构工程师， Email：zhouxianxiang1@163.com。