摘要
在合理的假设前提下,采用“龄期调整的有效模量法”得到的混凝土徐变方程式,推导出钢管核心混凝土的换算弹性模量计算公式,该公式能综合考虑混凝土的徐变影响和钢-混凝土之间的相互作用,将其应用到钢管混凝土拱桥的徐变分析中,极大简化了徐变分析过程。并基于通用有限元软件ANSYS,应用此方法对一座308米跨的钢管混凝土拱桥进行了徐变分析,通过比较,证明了该方法不仅可行,而且具有较高计算精度。同时还比较了新旧《桥规》中所建议的不同徐变系数模式对结构徐变效应的影响。
Based on some reasonable hypotheses and the stress-strain relationship of concrete obtained by the “adjusting valid modulus depending on age” method, a compact formula to calculate the conversion elastic modulus of the core concrete is presented, which can consider both the influences of creep and the interaction between steel and concrete. The application of the formula to creep analysis for the concrete-filled steel tubular （CFST） arch bridge can simplify the analysis process. At the same time, the method is implemented for creep analysis of a 308-meter-span CFST arch bridge by the FEM software ANSYS. By comparison, the proposed method is proved to be feasible and relatively precise. At the same time, the creep effect on structures is compared regarding the two different creep coefficient models recommended by the new and old bridge design codes.
出处
《工程力学》
EI
CSCD
北大核心
2007年第5期151-160,共10页
Engineering Mechanics
