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对目前混凝土桥梁的有限元计算方法和未来发展趋势做出评价与预测,提出一种以核心单元为基础,并配合其它多种辅助单元,针对混凝土桥梁结构的多单元协作分析方法。核心单元是对原有实体等参元的继承和拓展,不仅在单元内采用选择性积分的方法计算单元刚度矩阵,而且能够分别考虑混凝土和钢筋各自对单元刚度矩阵的贡献,再根据结构中不同构件所具有的力学性质,引入多种辅助单元进行模拟;各种单元通过自由度变换的方法有机的结合在一起,能够实现对大跨径混凝土桥梁的空间有限元计算的全桥建模。经实测数据对比分析,多单元协作分析的方法能够对混凝土桥梁做出更为准确的分析,其应力、应变及位移等各项指标均能够满足工程精度的要求。
This paper evaluates and predicts the current finite element method and future development trend of concrete bridges, and proposes a multi-element collaborative analysis method based on core element and other various auxiliary elements for concrete bridge structure. The core unit inherits and expands the isoparameters of the original entity. The unit stiffness matrix is calculated not only by using selective integrals in the unit, but also by considering the respective contributions of concrete and steel to the unit stiffness matrix. Based on the differences in structure The mechanical properties of the members are introduced by introducing a variety of auxiliary units for simulation. Various units are organically combined by the method of degree-of-freedom transformation, which can realize the full-bridge modeling of the space finite element calculation of long-span concrete bridges. After comparing the measured data, the multi-unit collaborative analysis method can make a more accurate analysis of concrete bridges, and the indexes of stress, strain and displacement can meet the requirements of engineering accuracy.