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大跨度斜拉-T构协作体系桥具有显著的几何非线性行为,且存在材料特性、几何尺寸的随机性。应用响应面法,选择出若干个对因变量影响较大的随机变量参与响应面拟合。对大跨度斜拉-T构组合体系桥——金马大桥进行了非线性随机静力分析,讨论了在恒载作用下材料、几何尺寸的随机性对主梁-T构连接处竖向挠度的影响。结果表明:结构随机性的影响较明显;斜拉索材料的变异对结构响应影响较大。为大跨度斜拉-T构协作体系桥受力分析提供参考,同时为复杂结构体系不确定性参数的随机分析提供相应的思路。
The long-span cable-stayed bridge system has obvious geometric nonlinear behavior, and there is randomness of material properties and geometric dimensions. Response surface method was used to select a number of random variables that greatly influenced the dependent variables to participate in the response surface fitting. The nonlinear stochastic static analysis is carried out on the long-span cable-stayed-T composite system bridge-Jinma Bridge. The randomness of material and geometry under constant load is discussed. The vertical deflection of the main beam- influences. The results show that the randomness of the structure is more obvious. The variation of the material of the stay cable has a great influence on the structural response. It provides a reference for the analysis of the mechanical behavior of long-span cable-stayed-T-bridge system and provides the corresponding ideas for the stochastic analysis of the uncertain parameters of complex structural systems.