多层砖砌体建筑预应力抗震加固新技术研究进展*
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（北京市建筑工程研究院有限责任公司， 北京 100039）
［摘要］针对城镇既有砖砌体建筑抗震性能较差的问题，提出了一种适合多层砖砌体房屋的抗震加固新技术，即采用竖向无粘结预应力筋对砌体墙体进行加固，从而改善墙体的抗震性能，提高房屋的整体抗震能力。为了解该技术的加固效果，完成了两批共17片墙体构件的拟静力试验研究和一栋2层足尺房屋模型的拟动力试验研究。墙体构件的试验研究结果表明，该项加固技术可以大幅度提高砖砌体墙体的抗裂能力、受剪承载力和延性。房屋模型的拟动力试验研究则进一步表明，采用该项技术加固后，抗震设防烈度不足8度的房屋，在模拟9度罕遇地震的拟动力作用下基本保持弹性，抗震能力显著提高。在试验研究的基础上，提出了预应力加固砌体墙体的受剪承载力的计算方法。该技术在北京市怀柔区某多层办公建筑的实际应用情况表明，其具有施工工艺简单、工期短、成本低等优势。［关键词］多层建筑; 砖砌体结构; 预应力; 抗震加固; 受剪承载力中图分类号：TU362.02， TU317.1 文献标识码：A 文章编号：1002-848X(2016)05-0067-08
Research development of prestress seismic retrofitting new technology for multi-story brick masonry buildingsLiu Hang, Lan Chunguang, Hua Shaofeng, Han Mingjie(Beijing Building Construction Research Institute Co., Ltd., Beijing 100039, China)Abstract:Aiming at the problem that the seismic behaviors of existing brick masonry buildings in cities and towns are poor, a new seismic retrofitting new technology for multi-story brick masonry buildings was proposed using vertical unbounded prestressed tendons to improve the seismic behavior of the walls as well as to enhance the seismic capacity of the whole building. In order to know the retrofitting effect of this technology, quasi-static tests of 17 walls and the pseudo-dynamic test of a two-story full scale brick masonry building model were carried out. The test results of the walls show that the retrofitting technology can greatly increase the anti-crack ability, shear capacity and ductility of brick masonry walls. The pseudo-dynamic test results of the building model show that the original brick building, which is located in the area with the seismic fortification intensity less than 8 degree, remains basically elastic when subjected a the pseudo-dynamic impact equals to a severe earthquake of 9 degree seismic fortification intensity after the seismic retrofitting. In addition, its seismic ability is improved significantly. Based on the test studies, the calculating method of seismic shear capacity was proposed for the prestress retrofitted brick masonry wall. Practical application of the technology in a multi-story office building in Huairou district of Beijing demonstrates that the retrofitting technology has advantages of simple construction process, short construction period and low cost.Keywords:multi-story building; brick masonry structure; prestress; seismic retrofitting; shear capacity
*北京市科技计划重大项目（D131100003713003），中国博士后科学基金（2014M550020），北京市自然科学基金（8154045）。作者简介：刘航，博士，教授级高级工程师，一级注册结构工程师，Email: liuhang71@sina.com。
