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. T he maximum stress appears at welds and the circular arc transition section because of stress concentration,w hich 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.%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.
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