大跨度斜拉桥索梁锚固中的非线性接触问题

采用非线性接触单元来模拟大跨度斜拉桥索梁锚固区垫板与承压板之间不焊接的紧压密贴关系,分析了大跨度斜拉桥索梁锚固中的非线性接触问题。计算结果与国外一些大跨度斜拉桥锚固区模型试验结果进行了比较,结果较为吻合,而计算方法更为先进。分析结果与提出的另一种简化计算方法———等效板厚法进行了比较,发现除垫板和承压板的局部外,两种方法计算结果接近;等效板厚法可用于初步设计时选型、初算,而非线性接触方法可用于最终计算及指导模型试验。

Research on nonlinear contact problem of cable-beam anchorage for long-span cable-stayed bridge

The nonlinear contact finite element is adopted to simulate the state that the anchorage frame and setting plate of cable-beam anchorage joint of long-span cable-stayed bridge is not welded each other. The nonlinear contact problem is described in detail. The result is in the same with model test result made by overseas academician;moreover the method adopted here is more advanced. Compared with the simplified method presented in this paper--equivalent plate thickness method,it is indicated that both methods are in the same except for the local area of anchorage frame and setting plate. The equivalent plate thickness method can be used in choosing type and rough calculating in primary design. The nonlinear contact method can be used in final calculating and guiding model test.