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结构可靠性理论可有效地评估结构老化的程度。通过研究给出一个程序,用于评估存在部分腐蚀板构件的钢箱梁桥的极限强度的可靠性。基于腐蚀和强度衰减的解析式,提出一种确定钢箱梁极限强度的概率模型。研究内容包括典型结构选型、极限状态方程、腐蚀钢箱梁抵抗模型的发展、可靠性分析法的发展、选定桥梁的可靠性分析和可靠性时程曲线的发展,以及腐蚀引起的结构退化。研究结果较好地预测退化钢箱型梁桥的使用年限和可靠性设计优化方案的发展。
Structural reliability theory can effectively assess the degree of structural aging. A program was developed to evaluate the reliability of the ultimate strength of a steel box girder bridge with partially eroded plate members. Based on the analytic formula of corrosion and strength attenuation, a probabilistic model to determine the ultimate strength of steel box girder is proposed. The research contents include the selection of typical structure, the equation of state of limit, the development of corrosion model of steel box girder, the development of reliability analysis method, the reliability analysis of selected bridges and the development of reliability time history curve, and the structural degradation caused by corrosion . The results of the study predict well the development of the service life and reliability design optimization scheme of the degraded steel box girder bridge.