考虑滑移与时间效应的组合梁精确有限元法及应用  

Accurate Finite Element Method and Application for Composite Beams Considering Slip and Time-Dependent Effects

作　　者：盛希凯 SHENG Xikai

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《重庆建筑》2025年第4期62-67,共6页Chongqing Architecture

摘　　要：采用具有精确有限元的刚度矩阵对钢混组合梁进行数值分析,考虑了组合梁中界面滑移以及混凝土层的徐变收缩特性的影响,旨在打破传统有限元法先引入假设位移场的局限性。从直接刚度法的角度出发利用平衡微分方程进行刚度矩阵的精确推导,经验证,该方法比传统有限元更具有高精度的特性,同时又可以较为准确地模拟组合梁在长期效应下考虑收缩徐变的挠度计算,并编写了相应的有限元程序。Numerical analysis of steel-concrete composite beams is conducted using a stiffness matrix with precise finite elements,taking into account the influence of interface slip in the composite beam as well as the creep and shrinkage characteristics of the concrete layer.The aim is to overcome the limitations of traditional finite element methods that first introduce an assumed displacement field.Starting from the perspective of the direct stiffness method,the stiffness matrix is derived precisely using equilibrium differential equations.This method has been verified to offer higher accuracy compared to traditional finite element methods and can accurately simulate deflection calculations for composite beams under long-term effects,considering shrinkage and creep.A corresponding finite element program has also been developed.

关 键 词：精确有限元 收缩徐变 挠度 滑移 

分 类 号：U414[交通运输工程—道路与铁道工程]