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现代PC(预应力混凝土)结构桥梁受力复杂,根据其受力特点,提出用实体退化虚拟层合单元建立三维有限元模型;将预应力筋作为结构的一部分,用等效节点荷载模拟预应力的张拉效应;利用TL法考虑结构的几何非线性效应;采用Ohtani&Chen假定的多重强化塑性模型考虑混凝土材料的非线性行为,对于预应力钢绞线和普通钢筋则分别选用线性强化和理想弹塑性模型。以一实际刚构桥为对象进行应用研究,说明了方法的有效性,计算结果表明,达到极限状态时的载荷因子为13.908 5,相应的安全系数为2.265。
According to the characteristics of its force, a 3D finite element model of solid degenerated virtual laminar unit is proposed. As a part of the structure, the prestressed tendons are modeled by the equivalent node loads to simulate the prestress The nonlinear effect of the structure is considered by using the TL method. The nonlinear plastic behavior of the concrete is considered by the multi-plastic model of plastic reinforced by Ohtani and Chen. For the prestressed steel strand and the common steel, linear reinforcement and ideal elastic-plastic model. The application of a rigid frame bridge is studied. The effectiveness of the method is demonstrated. The calculation results show that the load factor at the limit state is 13.908 5 and the corresponding safety factor is 2.265.