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组合单元是一种针对钢筋混凝土结构数值计算而产生的单元形式,是对原有实体等参元的继承和拓展,能够分别考虑混凝土和钢筋各自对单元刚度矩阵的贡献。在计算该单元刚度矩阵时,只在单元内有混凝土的区域内积分,可计算出混凝土刚度矩阵;又采用独立的空间杆单元模拟在单元内部的钢筋,建立钢筋刚度矩阵;而两者又通过自由度变换的方法有机的结合在一起,形成一种新的单元形式。和常规的实体单元相比,该单元具有:网格划分自由;能够以较少的单元模拟复杂的结构形式;尤其在计算混凝土收缩、徐变效应时,可以考虑钢筋的阻碍作用;再通过引入用于辅助单元,可以实现对现代化大跨径混凝土桥梁仿真分析的全桥建模。经吉林省西昌混凝土斜拉桥静载试验实测数据对比分析,该单元能够准确的计算出结构变形,其应力、应变等各项指标也能满足工程精度要求。
The combination unit is a kind of unit form for the numerical calculation of reinforced concrete structures. It inherits and expands the isoparameters of the original entity, and can respectively consider the contributions of concrete and steel bar respectively to the unit stiffness matrix. When calculating the element stiffness matrix, the concrete stiffness matrix can be calculated by integrating only in the area with concrete in the element, and using independent space-bar elements to simulate the reinforcement in the element to establish the stiffness matrix of the steel. The methods of transforming degrees of freedom are organically combined to form a new unitary form. Compared with the conventional solid elements, the element has the following advantages: free meshing; the ability to simulate complex structures with fewer elements; especially in the calculation of concrete shrinkage and creep effects, the obstruction of reinforcing steel can be considered; For the auxiliary unit, full-bridge modeling of modern long-span concrete bridges can be achieved. Comparing and analyzing the measured data of static load test of Xichang concrete cable-stayed bridge in Jilin Province, the unit can accurately calculate the structural deformation, and its stress, strain and other indicators can meet the requirements of engineering accuracy.