预应力混凝土桥梁因钢束锈蚀的非线性分析

Nonlinear Analysis of Prestressed Concrete Bridge with Corroded Steel Strands

钢束锈蚀的混凝土桥梁非线性分析方法的研究,对于在役损伤的预应力混凝土桥梁的失效机理分析或耐久性评估都具有一定的意义。针对锈蚀钢束与混凝土间存在的粘结与滑移问题,以Saenz公式和Skogman公式分别作为混凝土和预应力钢束的应力-应变本构关系,采用非线性弹簧模拟,提出刚臂元-非线性弹簧元-钢束元的方法,对锈蚀钢束与混凝土之间的粘结滑移进行分析。并以具体工程实例进行了分析计算,证明了所提出的方法用于预应力混凝土桥梁关于钢束锈蚀非线性分析的有效性。

Research of the method of nonlinear analysis of concrete bridge with corroded steel strands means a lot to the failure mechanism analysis and durability assessment about the existing damaged prestressed concrete bridges. With Considering the problem of bond and slip between rusty steel strands and concrete, the formulas of Saenz and Skogman were applied separately to show the stress-strain constitutive relationships of concrete and prestressed tendons.Nonlinear spring and an analytical method of rigid arm element-nonlinear spring element - steel strand element were used to simulate the bond and slip between rusty steel strands and concrete. A case study was conducted and the result proves that the effectiveness of the method applied for nonlinear analysis of corroded steel strands in prestressed concrete bridge.