基于拉力场理论的腹板连接剪切型可替换耗能梁段的极限承载力分析

Analysis on ultimate bearing capacity of web-connected replaceable shear links based on tensile field theory

针对现行规范未给出腹板连接剪切型双C槽钢可替换耗能梁段极限承载力计算方法的问题,基于Rockey拉力场理论构建了腹板连接剪切型双C槽钢可替换耗能梁段承载力的简化计算模型,推导出考虑翼缘刚度影响的腹板连接剪切型可替换耗能梁段抗剪承载力的计算公式.为了验证计算公式的可靠性,完成了14个腹板连接剪切型可替换耗能梁段数值模拟分析,并选取其中4个试件进行耗能梁段的剪切试验.结果表明:耗能梁段截面尺寸和长度比是影响其承载力的主要因素,抗剪极限承载力的增幅最高可达15.0%;计算公式结果与数值模拟结果的误差为0.09%~10.20%,与试验结果误差为3.9%~7.3%,吻合性较好,说明该公式可为简化计算耗能梁段的极限承载力提供参考.

To solve the problem that the current code does not give a calculation method for the ultimate bearing capacity of replaceable double channel steel shear links,a hypothetical model for the bearing capacity of web-connected replaceable double channel shear links was established based on Rockey s tension field theory.A formula for the ultimate bearing capacity of web-connected replaceable shear links considering the influence of the flange stiffness was deduced.To evaluate the reliabilty of the proposed formula,the numerical simulation analyses of 14 web-connected replaceable shear links were completed,and 4 specimens were selected for shear tests.The results show that the section size and the length ratio of the shear links are the main influence factors of the bearing capacity,and the increase in the ultimate shear bearing capacity is up to 15.0%.The errors between the formula results and the numerical simulation ones are 0.09%to 10.20%,and those between the formula results and the experimental ones are 3.9%to 7.3%.The good coincidence indicates that this formula can provide a reference for simplifying the calculation of the ultimate bearing capacity of the shear links.