既有建筑结构安全性鉴定中分项系数的调整研究  

Research on adjusting partial factors in safety appraisal of existing building structure

作　　者：刘立渠 彭立新 赵振红 沈孛 张志远 张建林 罗水生 LIU Liqu;PENG Lixin;ZHAO Zhenhong;SHEN Bo;ZHANG Zhiyuan;ZHANG Jianlin;LUO Shuisheng(China Academy of Building Research,Beijing 100013,China;National Engineering Research Center of Building Technology,Beijing 100013,China;CABR Testing Center Co.,Ltd,Beijing 100013,China;Design and Research Institute of Nanchang University,Nanchang 330046,China)

机构地区：[1]中国建筑科学研究院有限公司,北京100013 [2]国家建筑工程技术研究中心,北京100013 [3]建研院检测中心有限公司,北京100013 [4]南昌大学设计研究院,江西南昌330046

出　　处：《建筑结构学报》2024年第4期247-253,共7页Journal of Building Structures

基　　金：中国建筑科学研究院有限公司科研基金项目(20220112330730019);建研院检测中心有限公司青年科研基金项目(20220126977430002)。

摘　　要：在既有建筑结构鉴定中直接采用设计公式简单通用,但基于可靠指标调整分项系数的鉴定方法更为合理,既能充分利用既有建筑的实际现状,又能避免潜在的不定性风险。为此,基于可靠指标对构件承载力分项系数分解算法进行比较,阐述抗力分项系数、材料强度分项系数的调整方法,并通过工程算例验证其用于既有建筑结构鉴定的可行性。通过研究比较可知:直接分解法简单明了,当构件承载力变异系数在0.11~0.15,可靠指标在3.5~5之间取值时,直接分解法和间接分解法等效;对于既有建筑结构,按调整抗力分项系数、材料强度分项系数的方法进行鉴定具有可行性,尤其是采用调整材料强度分项系数的鉴定方法,在检测批合理划分、检测数据可靠的情况下,既可以充分利用既有建筑的实测材料强度或材料强度分项系数的可靠指标裕度,又能满足标准规定的目标可靠指标要求。It is simple and universal to directly use the design formula in the appraisal of existing building structures.However,the appraisal method of adjusting partial factor based on the reliability index is more reasonable,which can make full use of the actual situation of existing buildings and avoid potential uncertain risks.Therefore,based on the reliability index,decomposition algorithms of component bearing capacity partial factors were compared.The adjustment methods of resistance partial factors and material strength partial factors were illustrated,and their feasibility in the identification of existing building structures was verified through engineering examples.Through research and comparison,it can be concluded that the direct decomposition method is simple and clear.When the variation factor of bearing capacity is between 0.11 and 0.15,and the reliability index is between 3.5 and 5,the direct decomposition method and the indirect decomposition method are equivalent.It is feasible to evaluate existing building structures by adjusting the resistance factor and material strength factor,especially by using the method of adjusting material strength factor.With reasonable division of testing batches and reliable testing data,the reliability index margin of the measured material strength or material strength factor of the existing building can be fully utilized,and the target reliability index requirements specified in the standard is also satisfied.

关 键 词：既有建筑结构 可靠指标 安全性鉴定 构件承载力 抗力分项系数 材料强度分项系数 

分 类 号：TU317[建筑科学—结构工程]