钢筋混凝土深受弯构件抗剪承载力计算修正方法  

A modified method for calculating the shear capacity of RC deep flexural members

作　　者：金浏[1] 宋博[1] 张江兴 杜修力[1] Jin Liu;Song Bo;Zhang Jiangxing;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：《土木工程学报》2023年第7期23-33,44,共12页China Civil Engineering Journal

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

摘　　要：钢筋混凝土(RC)深受弯构件已广泛应用于混凝土结构领域。相比于钢筋混凝土细长梁,RC深受弯构件的剪切破坏往往表现出较强的尺寸效应特征,这使得RC深受弯构件的抗剪承载力设计区别于钢筋混凝土细长梁。我国规范GB 50010—2010已经提出了RC深受弯构件抗剪承载力的建议公式,但仍然存在未考虑尺寸效应及纵筋的影响。文章通过搜集相关文献,整理得到1023组RC深受弯构件的试验数据,并采用灰度关联法揭示了各因素对其抗剪承载力影响的重要程度。然后通过回归分析,提出了尺寸效应修正系数及纵筋修正系数,进而对规范GB 50010—2010提出了一些修正建议。最终通过搜集的试验数据,验证了修正后计算公式的合理性及准确性,研究表明:修正建议公式可以相对全面的反映重要因素的影响,且从均值、变异系数和安全系数等方面均有明显优势。Reinforced concrete(RC)deep flexural members have been widely used in the field of concrete structures.Unlike reinforced concrete slender beams,RC deep flexural members often exhibit strong size effect characteristics during their shear failures,interpreting why the design of the shear capacity of RC deep flexural members shall be different from that of RC slender beams.In the code of GB 50010—2010,a formula for the shear capacity of RC deep flexural members is suggested,but it does not account for the size effect or the influence of longitudinal reinforcement.In this work,a total of 1023 test data of RC deep flexural members are collected by reviewing relevant literature,and the gray correlation method is employed to determinie the significance of various factors affecting the shear capacity.Subsequently,based on the regression analysis,the correction factors for size effect and the longitudinal reinforcement are proposed,and revision to the GB 50010—2010 is recommended.Finally,the rationality and accuracy of the revised calculation formula are verified through the collected test data.The study shows that the revised formula can comprehensively reflect the influence of important factors and has obvious advantages in terms of mean value,coefficient of variation,and safety factor.

关 键 词：RC深受弯构件 灰度关联法 尺寸效应 纵筋率 抗剪承载力 

分 类 号：TU318[建筑科学—结构工程]