混凝土受拉边倾斜变截面梁受剪承载力数值分析  

Numerical analysis of shear bearing capacity of concrete haunched beams with an inclined edge under tension

作　　者：余东 李井超 孟一 王玉奎 孟新田[1] 冯浩雄[1] YU Dong;LI Jingchao;MENG Yi;WANG Yukui;MENG Xintian;Feng Haoxiong(School of Civil Engineering,Hunan City University,Yiyang,Hunan 413000,China)

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000

出　　处：《湖南城市学院学报（自然科学版）》2023年第6期1-7,共7页Journal of Hunan City University:Natural Science

基　　金：湖南省自然科学基金项目(2020JJ5020,2021JJ50157,2021JJ50141)。

摘　　要：为研究混凝土受拉边倾斜变截面梁在集中荷载下的抗剪性能,首先,根据目前主流混凝土等截面梁受剪承载力模型,归纳了中国建筑科学研究院有限公司和Gulsan的试验中变截面梁临界斜裂缝的特点;其次,为克服有限元程序在模拟裂缝上的不足,建立了受拉边倾斜变截面梁的预设斜裂缝有限元模型,并对变截面梁的受剪破坏过程进行了模拟分析;然后,通过分析在极限荷载时临界截面上的应力状态规律,提出了受剪承载力模型假定,采用临界截面上的受压区混凝土剪压破坏准则,建立了受剪承载力计算方法;最后,收集了国内外40根变截面梁受剪试验数据,与本文方法、我国规范方法、Gulsan方法的预测值进行了统计分析.结果表明本文方法的计算精度更高,可为工程实践和规范修订提供参考.In order to study the shear performance of concrete haunched beams with inclined edge on tension under concentrated load,the characteristics of critical oblique cracks in haunched beams were summarized in the experiments conducted by the Institute of Architectural Sciences of China and Gulsan.Based on the current mainstream shear bearing capacity model of concrete prismatic beams,a pre-set oblique crack finite element model of haunched beams with an inclinde edge under tension was established,and the shear failure process of haunched beams was simulated.By analyzing the stress state law on the critical section under ultimate load,a shear bearing capacity model assumption was established.The shear compression failure criterion of concrete on thecritical section was adopted,and a calculation method for shear bearing capacity was established.The shear test data of 40 haunched beams both at home and abroad are collected and statistically analyzed with the predicted values of the method in this paper,Chinese code method and Gulsan method.The results show that the calculation accuracy of this method is higher,which can provide reference for engineering practice and code revision.

关 键 词：受拉边倾斜变截面梁 受剪破坏形态 有限元分析 临界截面 剪压破坏准则 受剪承载力计算方法 

分 类 号：TU375.1[建筑科学—结构工程]