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提出一种有限元模型,用于体外预应力节段预制试验梁力学性能数值分析。该有限元模型用ANSYS通用分析软件中的SOLID65单元建立试验梁的3D实体模型,以接触单元模拟节段之间的干接缝,用节点耦合法实现体外预应力束与混凝土梁之间的连接。考虑混凝土材料非线性和几何非线性,通过数值模拟分析揭示试验梁的结构行为、混凝土接缝处的应力变化规律和裂缝张开情况。该有限元模型研究了预应力配束形式、体外预应力二次效应和转向处滑移对试验梁弯曲力学性能的影响。数值分析揭示了在荷载300kN以前,节段接缝处于受压状态;在300kN以后,裂缝张开是影响试验梁力学性能的主要因素。研究结果可用于预制节段桥梁的设计。
A finite element model is proposed for numerical analysis of mechanical properties of prestressed prestressed beams in vitro. The finite element model is based on SOLID65 element of ANSYS general analysis software to establish the 3D solid model of test beam to simulate the dry joint between the sections and to realize the connection between external prestressed beam and concrete beam . Considering the nonlinear and geometrical nonlinearity of the concrete, the structural behavior of the test beam, the stress variation at the concrete joint and the crack opening are revealed by numerical simulation analysis. The finite element model is used to study the influence of prestressing bundles, secondary prestressing force and steering slip on the bending mechanics performance of test beam. Numerical analysis reveals that the joint of the segment is under compression before 300 kN load. After 300 kN, the crack opening is the main factor that affects the mechanical properties of the test beam. The results can be used to design prefabricated section bridges.