建筑结构

2020, v.50;No.528(12) 116-120

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低强度砂浆砌体抗震加固设计分析
Analysis on seismic strengthening design of low-strength mortar masonry

吴清;许锦燕;刘湘;江波;
WU Qing;XU Jinyan;LIU Xiang;JIANG Bo;Architectural Design & Research Institute of Tsinghua University Co., Ltd.;

摘要(Abstract):

通过低强度砂浆砌体的抗震加固工程实例,依据现行加固规范《砌体结构加固设计规范》(GB 50702—2011)、《建筑抗震加固技术规程》(JGJ 116—2009)和北京市地方标准《建筑抗震加固技术规程》(DB 11/689—2016)相关规定及试验研究结果,分析了低强度砂浆砌体加固,提出钢筋网水泥砂浆面层加固法比钢筋混凝土面层加固法具有更好的适宜性及经济性;同时结合相关试验及规范,计算分析了水平钢筋、新增混凝土强度和原砌体砂浆强度变化对钢筋混凝土面层加固砌体抗剪承载力与原砌体抗剪承载力比值的影响,对钢筋混凝土面层加固设计计算、构造措施提出了控制抗剪承载力增强系数和加强接触面粘结力的构造要求。低强度砂浆砌体结构加固应优先选择钢筋网水泥砂浆面层加固法;采用钢筋混凝土面层加固法时,墙体抗震承载力增强系数的合理取值范围应补充试验研究。
Based on the seismic strengthening example of low-strength mortar masonry, the low-strength mortar masonry strengthening was analyzed according to the current strengthening codes, including Code for design of strengthening masonry structures(GB 50702—2011), Technical specification for seismic strengthening of buildings(JGJ 116—2009) and the Beijing municipal standard Technical specification for seismic strengthening of buildings(DB 11/689—2016) and the results of test and research. Strengthening method with steel mesh cement mortar has better suitability and economy than slab wall strengthening method with concrete; at the same time, combined with relevant tests and codes, the influences of horizontal reinforcement, new concrete strength and the change of the original masonry mortar strength were calculated and analyzed on the ratio of the shear capacity of the masonry strengthening with concrete slab wall to that of the original masonry. The structural requirements for the design calculation and structural measures of strengthening with concrete slab wall by the control of the shear capacity improvement coefficient and the strengthening of the bond strength of the contact surface were put forward. The strengthening method with steel mesh cement mortar should be preferred in the strengthening of low-strength mortar masonry structure; when strengthening with concrete slab wall is adopted, the reasonable range of increasing coefficient of seismic bearing capacity of the wall should be supplemented by experimental research.

关键词(KeyWords): 砌体结构;抗震加固;钢筋混凝土面层加固;钢筋网水泥砂浆面层加固法;低强度砂浆砌体
masonry structure;seismic strengthening;strengthening with concrete slab wall;strengthening with steel mesh cement mortar;low-strength mortar masonry

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作者(Author): 吴清;许锦燕;刘湘;江波;
WU Qing;XU Jinyan;LIU Xiang;JIANG Bo;Architectural Design & Research Institute of Tsinghua University Co., Ltd.;

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