摘要
提出一种不传递弯矩的墩梁半刚性连接节点,开展12个分别考虑不同影响参数的足尺节点模型拟静力试验,对比研究节点传力机理,分析刚度变化规律;采用验证后的有限元模型开展主要影响参数扩展分析,通过数值拟合方法,建立考虑半刚性节点剪切刚度和抗弯刚度计算方法。结果表明:水平荷载作用下,节点先平动再转动,该构造能利用钢棒的弯曲能力和橡胶套的压缩能力来实现桥梁上、下部结构连接处的半刚接性能。橡胶套厚度与钢棒直径是影响半刚性连接节点剪切刚度和抗弯刚度的主要因素,同时钢棒的根数与节点剪切刚度和抗弯刚度成近线性倍数关系,钢棒高度和橡胶垫厚度对节点受力性能的影响可以忽略不计。随着钢棒直径增大,半刚性节点平动位移逐渐减小,剪切刚度和抗弯刚度呈非线性递增关系。随着橡胶套厚度增大,半刚性节点平动位移逐渐增大,剪切刚度和抗弯刚度呈非线性递减关系。考虑钢棒直径和橡胶套厚度双参数变化的刚度计算公式,可用于墩梁半刚性连接节点设计。
In this study,a semi-rigid joint of pier-beam connection without transmitting bending moment was proposed.The pseudo static tests of 12 full-scale joint specimens considering different influence parameters were carried out,so that the force transmission mechanism of the joints were compared,and the variation law of stiffness were analyzed.The validated finite element model was used to perform the extended analysis of the main influence parameters.By applying the numerical fitting method,the calculation methods for shear stiffness and bending stiffness of semi-rigid joints were established.Results show that the joints move horizontally and then rotates under the horizontal load,and the configuration,which makes use of the bending capacity of steel bar and the compression capacity of rubber sleeve,may realize the semi-rigid performance of the connection between the upper and lower structures of the bridge.The thickness of rubber sleeve and the diameter of steel bar are the main factors affecting the shear stiffness and bending stiffness of semi-rigid joints.At the same time,the number of steel bars is nearly related to the shear stiffness and bending stiffness with a multiple.The influence of the height of steel bar and the thickness of rubber pad may be neglected.With the increase of steel bar diameter,the translational displacement of semi-rigid joints decreases gradually,and the shear stiffness and flexural stiffness increase nonlinearly.With the increase of rubber sleeve thickness,the translational displacement of semi-rigid joints gradually increases,and the shear stiffness and flexural stiffness exhibit a nonlinearly decreasing relationship.Hence,the stiffness calculation formula considering the changes of steel bar diameter and rubber sleeve thickness may be used in the design of pier-beam connection.
作者
黄育凡
吴庆雄
刘钰薇
袁辉辉
Huang Yufan;Wu Qingxiong;Liu Yuwei;Yuan Huihui(College of Civil Engineering,Fuzhou University,Fuzhou 350116,China;Fujian Provincial Key Laboratory on Multi-Disasters Prevention and Mitigation in Civil Engineering,Fuzhou University,Fuzhou 350116,China;Key Laboratory of Civil Engineering,Fujian Province University,Fuzhou University,Fuzhou 350116,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2023年第10期78-92,共15页
China Civil Engineering Journal
基金
国家重点研发计划(2017YFE0130300)
国家自然科学基金(51608125)。
关键词
桥梁工程
墩梁节点
半刚性连接
拟静力试验
有限元分析
刚度计算
bridge engineering
pier-beam joints
semi-rigid connection
pseudo-static testing
finite element analysis
stiffness calculation
