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钢管混凝土组合高墩连续刚构桥体系可靠度计算存在钢管混凝土组合高墩受力分析复杂,连续刚构桥梁失效模式较多,其功能函数不存在显式等问题。采用MIDAS有限元软件对结构进行较准确的模拟和受力分析,然后根据分析结果选取最高墩的稳定性失效和关键截面的拉、压应力失效模式。在MATLAB语言的平台上利用二次序列响应面法将隐式功能函数显式地表达出来,再经过多次的迭代计算实现钢管混凝土组合高墩连续刚构体系可靠指标的计算。研究表明,该方法迭代次数少,效率较高,可实现同类桥梁功能函数重构和体系可靠度计算。
FRACTURE CALCULATION OF HIGH-ROW CONTINUOUS RIGID FRAME BRIDGE SYSTEM WITH CONCRETE-FILLED STEEL TUBE The present mechanical analysis of high pier with CFST composite is complicated. There are many failure modes of continuous rigid-framed bridges, and there are no explicit functional problems. The finite element software MIDAS is used to simulate and analyze the structure more accurately. According to the analysis result, the failure failure of the top pier and the failure mode of the compressive stress of the key cross section are selected. In the MATLAB language platform, the explicit function of implicit function is expressed by the second order response surface method, and then the calculation of the reliable index for the continuous rigid frame system of high concrete - filled steel tubular grouped by repeated iteration calculation. The research shows that this method has fewer iterations and higher efficiency, which can reconstruct the function of the bridge and calculate the system reliability.