寿命期内钢筋混凝土连续梁体系可靠度分析

建立了一种基于概率和有限元的寿命期内钢筋混凝土桥梁性能演变分析方法.在重点解决材料力学性能退化、截面面积削弱以及结构整体力学性能演变等问题数值模拟方法的基础上编写了耐久性分析程序CBDAS;根据现有研究成果建议了结构性能演变分析中出现的主要随机变量的统计参数;结合CBDAS和Monte-Carlo模拟建立了钢筋混凝土桥梁时变体系可靠度分析方法.最后,以一座钢筋混凝土连续梁为对象,利用时变体系可靠度研究其在氯离子侵蚀作用下寿命期内的结构性能演变规律.

System Reliability Assessment of Reinforced Concrete Continuous Bridges in Service Life

To simulate the lifetime performance of reinforced concrete bridges, a probabilistic- and finite element-based lifetime performance assessment method is proposed. A durability analysis program named CBDAS (Concrete Bridge Durability Analysis System) is written based on the numerical simulation methods relating to the deterioration of materials properties, reduction of sectional areas, and variation of structural performance. Then the statistical parameters of the random variables involved in the assessment of structural lifetime performance are recommended according to the present studies. Thus, the time-variant system reliability assessment method of reinforced concrete bridges is set up based on CBDAS and Monte-Carlo simulations. Finally, the lifetime performance of a reinforced concrete continuous bridge under chloride penetration is investigated by means of the time-variant system reliability.