薄壁箱形梁桥约束扭转下翘曲、畸变和剪滞效应的空间分析

THREE DIMENTIONAL ANALYSIS FOR WARPING,DISTORTION AND SHEAR LAG EFFECT OF THIN WALLED BOX GIRDER BRIDGE UNDER RISTRAINED TORSION

本文用一般杆系结构刚度法原理,通过对普通杆件增加四个节点位移未知量,推导出了约束扭转下翘曲、畸变和剪力滞效应的箱形梁空间单元刚度矩阵和均布荷载作用下的等效节点力向量计算式,使箱形梁桥结构分析可按一般杆系结构刚度法进行,减少了计算自由度和简化了许多数据准备,数据分析工作.

This paper presents an extension of the stiffness method to the three-dimensional analysis of thin-walled box beam structures under restrained torsion by the addition of four extra degrees of freedom representing the action of warping, distortion as well as the shear lag effects.The formulation of a three-dimensional stiffness matrix and the equivalent nodal force subjected to uniformly dis -tributed flexural and torsional loads have been developed.The proposed method is applied to the stiffness analysis of the structure behavior of thin-walled box girder as the conventional structural member systems-The advantage of the present approach lies in the greatly reduced degree of freedom as well as data storage and data analysis,all these are worthy objectives.