混凝土桥梁结构的多单元协作分析(英文)

Multi-elements Cooperation Analysis on Concrete Bridge Structure

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。

The actual method of analyzing bridge structure is evaluated by the finite element,forecasted the development trend in the future,and proposed a method of ＂Multi-Element Cooperation Analysis＂.This method is based on central element and many other assistant elements,which is produced just to analyze concrete bridge structure.The central element inherits and expands the features of the original isoparametric element,moreover,can not only adopt the method of selective integral to calculate the element stiffness matrix,but also consider contributions of concrete and steels to the element stiffness matrix separately.Furthermore,according one＇s own mechanic behavior and characteristic of different components in bridge structure,many kinds of assistant elements are imported.By the method of degree of freedom mapping,all kinds of elements are organically combined together and the finite element model of long-span concrete bridge is created on whole structure.Compared with the actual data,the accuracy of ＂Multi-Element Cooperation Analysis＂ is verified satisfying the requirement of engineering calculation.