斜拉桥索梁锚固区边界条件对结构受力的影响

针对苏通(苏州-南通)长江公路大桥斜拉桥锚箱式索梁锚固结构进行了足尺静载试验,采用空间有限元方法分析实际结构和试验模型锚固区的应力与变形,将试验与计算结果进行比较,验证计算方法的正确性。在此基础上,做了大量仿真计算,详细探讨了索梁锚固结构周围边界条件的不同对结构受力的影响,计算了实际结构在不同约束条件下索梁锚固区的各种应力分布情况,进而得到了一些有益的结论,为今后类似结构试验的设计提供参考。

The Affection of Boundary Conditions to the Structure's Stresses in the Cable-Girder Anchorage Zone of Steel Cable-Stayed Bridges

With the background of Suzhou-nantong Yangtze River Bridge,a cable stayed bridge,full scale static load model test of the cable-girder anchorage zone was carried out.The results of model tests were compared with space finite element analysis.The detailed stress distribution and deformation in the real structure and test model as well as the reliability of calculations were investigated.What's more,based on the model test and theoretical analysis,numerical simulations were performed.The affection of boundary conditions on the stress in the beam and the mechanical behavior in the cable-girder anchorage were studied.The stress distributions of the real structure under different constraint conditions were calculated.Some useful conclusions which are beneficial to the design of the cable stayed bridges are obtained.The results of model test and the space finite element calculations are recommended as references for designs of similar structure test.