混凝土自锚式悬索桥徐变效应倒退分析

Backward analysis of shrinkage and creep effect of concrete self-anchored suspension bridge

为混凝土自锚式悬索桥考虑徐变效应进行倒退分析提供一种计算方法,针对混凝土自锚式悬索桥考虑徐变效应分析需要,基于混凝土徐变机理提出一种倒退分析计算方法。首先以混凝土自锚式悬索桥已知时刻的结构状态为分析基础,引入混凝土倒退徐变系数,通过倒退徐变系数进行徐变效应分析得到加载龄期时的结构状态,然后以加载龄期结构状态为基础,利用徐变系数进行徐变效应分析,即可得到混凝土自锚式悬索桥任意时刻的结构内力及变形状态,整个分析过程的关键在于加载龄期结构内力状态分析。工程实例验证结果表明:混凝土徐变效应倒退分析过程方便简洁,分析结果准确、有效,适用于包括混凝土自锚式悬索桥在内的混凝土结构徐变效应倒退分析,对混凝土结构设计优化及施工过程控制具有一定的指导作用,为混凝土徐变效应分析提供了一种新的研究方法。

This paper provides a calculation method for backward analysis of concrete self-anchored suspension bridges considering creep effects.In view of the need for analyzing creep effect of concrete self-anchored suspension bridges,a calculation method for backward analysis on the basis of concrete creep mechanism is proposed.Firstly,the structural state of the concrete self-anchored suspension bridge at a known time is viewed as the analysis basis,introducing the retrogressive creep coefficient of concrete,and the creep effect analysis is conducted through the retrogressive creep coefficient to obtain the structural state at loading age.Then,the creep effect analysis is carried out using the creep coefficient.The structural internal force and deformation state of the concrete self-anchored suspension bridge at any time can be obtained.The key to the whole analysis process is the analysis of the internal force state of the structure at the loading age.The engineering example verification shows that the process of concrete creep effect regression analysis is convenient and concise,resulting in an accurate and effective analysis.Applicable to the analysis of concrete structure creep effect regression,including concrete self-anchored suspension bridges,the approach plays a guiding role for the design optimization and construction process control of concrete structures,thus providing a new research method for analyzing concrete creep effect.