利用ANSYS建立郑州黄河公铁两用大桥斜边主桁下弦整体节点空间有限元模型,分析整体节点在设计最不利荷载组合下应力分布规律.选用1:2模型,对该整体节点进行试验研究.试验结果与有限元分析结果比较表明:试验结果和有限元计算结果基本吻合,精细有限元数值分析是整体节点局部应力分析的有效手段,可作为设计依据.在1.4倍设计荷载加载过程中,各测点处于弹性工作状态,整体节点构件应力满足规范要求,说明整体节点承载力能满足设计要求并有一定安全储备.%The 3D FEM model of the integral joints of the bottom chord of the inclined main truss of the Zheng-zhou Yellow River Highway-railway Bridge was established by using ANSYS. The law of stress distribution of the integral joints subjected to be designed most unfavorable load combination was investigated. Specimen tests of the integral joints with a scale of 1 : 2 were carried out. Comparing FEM analysis with the specimen tests, the stresses at test points in the FEM model were found to be in good agreement with those of tested specimens. The fine numerical FEM analysis can be used as an effective method to determine local stress distribution of the integral joints and as the basis of structure design. In the loading process where the maximum load reaches 1. 4 times of the design load, the linear relationship between measured strains and applied loads indicates that all test points remain in a linear elastic state and stresses of all members are less than the allowable stresses specified in the design code. The bearing capacity of the integral joints is seen to meet the need of design and to leave sufficient room for the structure safety.
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