FRP筋混凝土深受弯构件受剪承载力计算修正方法  

A method of calculating shear capacity of FRP-reinforced concrete deep flexural members

作　　者：金浏[1] 宋博[1] 杜修力[1] JIN Liu;SONG Bo;DU Xiuli(The Key Laboratory of Urban Security and Disaster Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市减灾与防灾防护教育部重点实验室,北京100124

出　　处：《建筑结构学报》2023年第12期170-182,共13页Journal of Building Structures

基　　金：国家重点研发计划项目(2018YFC1504302);国家自然科学基金项目(51822801)。

摘　　要：针对FRP筋混凝土深受弯构件,为了建立可以考虑多因素影响及尺寸效应的受剪承载力计算方法,搜集国内外相关文献,整理得到316组FRP筋混凝土深受弯构件的受剪承载力试验数据。采用灰色关联度分析法分析相关因素(梁截面高度、剪跨比、跨高比、配筋率等)对FRP筋混凝土深受弯构件受剪承载力影响的重要程度,定量揭示各因素对受剪承载力的影响规律。研究结果表明:梁截面高度、纵筋率、剪跨比、跨高比及腹筋率等是影响FRP筋混凝土深受弯构件受剪承载力的重要因素。通过对试验数据的回归分析,提出了尺寸效应、纵筋率、剪跨比和跨高比修正系数及腹筋安全系数,建立了可以考虑多因素影响的FRP筋混凝土深受弯构件受剪承载力的计算方法。通过受剪承载力计算值与试验值的对比,验证了计算公式的合理性及准确性。In order to propose a shear capacity calculation method for FRP-RC deep flexural members that can consider multiple factors and the size effect,a total of 316 experimental data on the shear capacity of FRP-RC deep flexural members were collected from much relevant literature at home and abroad.The gray correlation method was used to analyze the importance of relevant influencing factors(i.e.,cross-sectional height,shear-span ratio,span-height ratio,reinforcement ratio,etc.)on the shear capacity of FRP-RC deep flexural members,and the influence of each factor on the shear capacity was quantitatively revealed.The results indicate that cross-sectional height,longitudinal reinforcement ratio,shear-span ratio,span-height ratio,and web reinforcement ratio are important factors for the shear capacity of FRP-RC deep flexural members.The correction factor of relevant influencing factors(i.e.,cross-sectional height,shear-span ratio,span-height ratio,reinforcement ratio,etc.)and the safety factor of web reinforcement were proposed through the regression analysis.The calculation method of shear capacity of FRP-RC deep flexural members that can consider the influence of multiple factors was established.And the rationality and accuracy of the calculation formula were verified by comparing the calculated values with the experimental values.

关 键 词：FRP筋混凝土深受弯构件 尺寸效应 灰色关联度分析法 纵筋率 受剪承载力 

分 类 号：TU528.57[建筑科学—建筑技术科学] TU375.1