摘要
根据结合梁桥的特点,综合考虑施工过程中各种因素(混凝土的收缩徐变、结构体系转换等)的影响,采用按龄期调整的有效模量,结合有限单元步进法,提出一种分析结合梁中徐变的方法。然后采用该方法分析徐变对结合梁中的应力重分布的影响,并对徐变的影响进行参数分析。分析结果表明:混凝土加载龄期越早、环境越干燥、混凝土的圆柱体抗压强度越小,组合截面的应力重分布越明显。
With the finite element step-by-step method and the age-adjusted effective modulus method,a kind of method has been brought forward to analyze creep in steel-concrete composite beams.According to the characteristics of steel-concrete composite girder bridges,such influence factors as the shrinkage and creep of concrete and the transformation of structural systems have been taken into account in the analysis.With this method,the influence of creep on stress redistribution in composite beams has been analyzed,and rheologic parameters was studied .The study results show that the earlier the loading age of concrete,or the lower the ambient humidity,or the smaller the standard 28-day cylinder strength of concrete,the more prominent stress redistributions of sections in steel-concrete composite beams will become.
出处
《公路交通科技》
CAS
CSCD
北大核心
2004年第8期38-41,共4页
Journal of Highway and Transportation Research and Development
关键词
结合梁
徐变
应力重分布
Composite beam
Creep
Stress redistribution
