考虑整体节点刚域影响的钢桁梁桥空间受力计算分析  

The Calculation and Analysis of the Spatial Mechanical Behavior for Steel Truss Bridge Considering the Effect of Integral Joint Rigid Zone

作　　者：黄永辉[1] 王荣辉[2] 饶瑞[1] 

机构地区：[1]广州大学广州大学-淡江大学工程结构灾害与控制联合研究中心,广东广州510006 [2]华南理工大学土木与交通学院,广东广州510640

出　　处：《中国铁道科学》2012年第5期8-14,共7页China Railway Science

基　　金：国家自然科学基金资助项目(51208123;51208229);广东省科技计划国际合作项目(2009B050200015)

摘　　要：现代钢桁梁桥中大量采用整体节点技术。在建立全桥有限元计算模型时,其节点刚域的处理关系到计算结果的准确性。以东莞东江大桥为工程背景,采用带刚臂梁单元模拟钢桁梁桥整体节点板的刚度增强作用,建立全桥计算模型进行受力分析。该桥的有限元计算结果与动静载试验结果的对比表明:节点刚域对桥梁结构受力性能的影响不可忽略,不考虑节点刚域的影响时,桥梁中主桁和边主桁的挠度实测值与计算值的误差高达30%;采用刚臂梁单元考虑节点刚域影响后,误差减小约50%,而且上下弦杆以及加劲弦的应力计算结果与实测结果更吻合,模态频率的计算结果与实测结果的误差也不超过5%,计算精度显著提高。Integral joint technology is widely used in modern steel truss bridge. In establishing full-bridge FE model, how to handle the problem of joint rigid zone is an essential problem related to the calculation accuracy of the results. Taking Dongjiang Bridge in Dongguan as engineering background, beam elements with rigid arms were used to simulate the stiffness enhancement of integral gusset plate of steel truss bridge, and full-bridge calculation model was established to carry through mechanical analysis. Comparisons between FEA results and dynamic and static loading test results of this bridge indicate that the influence of joint rigid zone on the mechanical behavior of the bridge structure cannot be neglected. Without regard to the influences of joint rigid zone, the relative errors between the tested deflections and the calculated deflections of the bridge's middle and side main truss are up to 30%. If the influence of the joint rigid zones is considered using beam elements with rigid arms, these errors will be reduced by about 50%. Moreover, the calculated stresses of the upper and lower chord and the stiffening chord are more close to the measured results. The relative error between the calculated results of modal frequency and the tested ones is no more than 5%, and the calculation accuracy is remarkably improved.

关 键 词：钢桁梁桥 整体节点 刚域 刚臂 有限元模型 受力性能 

分 类 号：U448.14[建筑科学—桥梁与隧道工程] U448.211[交通运输工程—道路与铁道工程]