曲线桥梁结构徐变次内力分析

Effect of Concrete Creep on Secondary Internal Force in Curved Bridges

在线性徐变理论范围内，本文推导论证了任意断面形式的曲线构件的扭转变形与扭转力矩之间的一般关系式，从而将扭转徐变问题转化为单轴向受压徐变计算问题。介绍了素混凝土柱的扭转徐变试验及其结果，并据此用有效模量法编制曲线桥梁徐变效应分析的有限元程序，初步分析了混凝土徐变对曲线桥梁内力和变形的影响。计算结果表明，混凝土的徐变能在一定程度上改善曲线桥梁结构的扭转受力。

Based on the linear creep theory,a general relation between the twist of con-crete curved structural member of any-shaped cross section and the torque of the structuralmember is derived so that the prediction of creep effects in torsion of a concrete structure canbe transfomed in to those in compression,with the experimental data of creep in torsion pre-sented;A finite element analysis is programmed according to effective modulus method to fa-cilitate the calculation of the creep effects on internal force and deformation of the concretecurved structures. Results show that the torque effect in curved girder can be improved tosome extent.