混凝土板墙加固砖墙抗震受剪承载力计算方法的探讨

Discussion on calculation of seismic shear capacity of brick wall strengthening with concrete splint

混凝土板墙加固法是砌体结构抗震加固常用的方法之一,《砌体结构加固设计规范》(GB 50702—2011)和《建筑抗震加固技术规程》(JGJ 116—2009)中均给出了加固后墙体抗震受剪承载力计算公式,但两者计算结果存在较大的差异。为了对比两本标准的不同之处,计算结果统一采用增强系数进行表述,分析原砖墙砌筑砂浆强度等级、板墙厚度、墙体截面竖向压应力及原砖墙厚度等因素对承载力增强系数的影响,同时对两种计算方法的差异性进行定量分析,给出240mm厚砖墙规范增强系数参考值,为下一步的试验研究确定了方向,并为规范的修订和实际工程应用提供了理论参考。

Strengthening with concrete splint is one of the most frequently used methods in the reinforcement of masonry structure.The calculation formulas of seismic shear capacity brick wall strengthening with concrete splint are both given in Code for design of strengthening of masonry structures(GB 50702—2011)and Technical specification for seismic strengthening of buildings(JGJ 116—2009),but there is great difference between two calculation results.In order to compare the difference between the two standards,the calculation results of the two standards will be united firstly based on the reinforcement coefficient.The factors which influence the reinforcement coefficient of bearing capacity were analyzed,such as original brick wall′s cement mortar strength,thickness of the concrete wall,vertical compressed stress of wall section,thickness of original brick wall.And the difference of calculation methods in the two standards were quantitative analyzed,the standard reinforcement coefficient reference of 240 mm brick wall are given.For the next experimental study to determine the direction,and provides theoretic reference proposals for further revision of the standards and the practical engineering application.