榫卯-灌浆套筒混合连接装配式方墩轴压承载力  

Tenon-grouting Sleeve Connection Fabricated Square Pier Axial Compression Bearing Capacity

作　　者：林上顺 何乐 夏樟华[2] 张乐彤 叶世集 陈治雄 LIN Shangshun;HE Yue;XIA Zhanghua;ZHANG Letong;YE Shiji;CHEN Zhixiong(Fujian Provincial Key Laboratory of Advanced Technology and Information in Civil Engineering, Fujian University of Engineering, Fuzhou 350118, China;School of Civil Engineering, Fuzhou University, Fuzhou 350108, China;Fujian Rongsheng Municipal Engineering Co., Ltd., Fuzhou 350011, China)

机构地区：[1]福建工程学院福建省土木工程新技术与信息化重点实验室,福建福州350118 [2]福州大学土木工程学院,福建福州350118 [3]福建省榕圣市政工程股份有限公司,福建福州350011

出　　处：《郑州大学学报（工学版）》2022年第3期67-72,共6页Journal of Zhengzhou University（Engineering Science）

基　　金：福建省自然科学基金资助项目(2019J01779,2019H6020,2020J1477)。

摘　　要：采用ABAQUS软件,通过合理地挑选材料本构、单元类型,划分网格,建立边界条件,提出一种榫卯-灌浆套筒混合连接装配式方墩的有限元计算模型。该模型模拟了方墩在轴压荷载作用下的受力过程,与试验所得混凝土破坏形态、轴压极限承载力进行对比,分析了内部钢筋、钢管与灌浆套筒的受力状态,验证了所提模型的精度。在此基础上,以钢管混凝土(CFST)突榫中钢管的长度、厚度、直径为变量进行试验,结果表明:所提模型可以较好地模拟榫卯-灌浆套筒混合连接装配式方墩轴压过程,有限元计算得出的极限承载力与试验结果的比值的均值与方差分别为1.036和0.023;增大CFST突榫中钢管的长度、直径可以明显提高榫卯-灌浆套筒连接装配式桥墩的极限承载力,改变CFST突榫中钢管厚度使榫卯-灌浆套筒连接装配式桥墩的极限承载力呈先增大后减小的趋势,但相对于改变钢管的长度、直径来说影响甚微;提出地榫卯-灌浆套筒连接装配式方墩的轴压承载力简化计算公式,其计算结果均略低于试验和有限元参数分析的结果,与试验结果的相对误差均值为9.01%,与有限元计算结果的误差均值为4.05%,误差较小,可用于该类型方墩的轴压承载力计算。Using ABAQUS software,the finite element calculation model of square piers with tenon-grouting sleeve mixed connection was put forward by selecting material constitutive model and element type reasonably,dividing mesh and establishing boundary condition.The failure mode of concrete and the ultimate bearing capacity of concrete under axial load were compared with the test results,and the accuracy of finite element calculation was verified,the stress state of internal steel bar,steel pipe and grout sleeve was analyzed as the pressure increased.On this basis,taking the design parameters of CFST tenon(concrete-filled steel tube tenon)as the variables,the influence of the variables on the axial compression performance of the short pier of tenon-grouting sleeve hybrid connection was further studied,the results showed that the proposed finite element model could simulate the axial compression process of the square piers with tenon-grouting sleeve joint,the mean and variance of the ultimate bearing capacity calculated by finite element method and the test results were 1.036 and 0.023,respectively.Increasing the length and diameter of CFST tenon steel pipe could obviously increase the ultimate bearing capacity of the mortise-grouting sleeve connection bridge pier,the change of the thickness of CFST tenon steel tube had an increasing and decreasing trend for the ultimate bearing capacity of mortise-tenon-grout sleeve bridge pier,but it has little effect on the length and diameter of steel tube.In this study,a simplified formula for calculating the axial bearing capacity of square piers with mortise-tenon-grouted sleeve connection was presented.The calculated results were slightly lower than the results of tests and finite element analysis,and the average error between the calculated results and the experimental results was 9.01%,the error was 4.05%,and the error was small.It could be used to calculate the axial bearing capacity of this type of pier.

关 键 词：装配式方墩 轴压极限承载力 有限元模型 参数分析 计算公式 

分 类 号：TU312.1[建筑科学—结构工程]