超千米公铁两用斜拉桥关键节点模型试验  

Model test for key joints of extra-kilometer-span highway and railway shared cable-stayed bridge

作　　者：肖鑫[1,2] 潘永杰[1,2] 田越[1,2] 乐思韬[1,2] 

机构地区：[1]中国铁道科学研究院铁道建筑研究所,北京100081 [2]高速铁路轨道技术国家重点实验室,北京100081

出　　处：《铁道建筑》2015年第10期51-55,共5页Railway Engineering

基　　金：中国铁路总公司科技研究开发计划项目(2013G001-A-2)

摘　　要：为研究主桁整体节点构造的受力性能,结合在建沪通长江大桥,采用1∶2的几何缩尺模型,对其关键节点A60进行了模型试验研究和有限元理论分析。试验结果表明:在最不利荷载工况下,节点区域最大应力在材料的容许应力范围内,验证了节点设计的安全性与可靠性;节点最大应力出现在焊接处和圆弧过渡段,主要是该处应力集中所致;采用适当半径的圆弧过渡形式,可有效减小应力集中。试验结果验证了沪通桥关键节点设计的合理性,也为类似工程节点设计提供了重要依据。In order to study the behavior of the integral joint structure of main truss,a 1：2 geometric scale model test and finite element analysis of key joint A60 in Hutong Changjiang River Bridge were conducted.Test results show that in the case of the most unfavorable load,the maximum stress in the joint zone is within the allowable stress,verifying its safety and reliability.The maximum stress appears at welds and the circular arc transition section because of stress concentration,which can be effectively reduced by using the appropriate radius of circular arc transition form.The test results verify the rationality of key joint design of Hutong Changjiang River Bridge and may provide an important basis for similar projects.

关 键 词：整体节点 关键节点 模型试验 有限元分析 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]