摘要
钢管混凝土膨胀性能设计主要为补偿混凝土早期收缩变形,而往往忽略季节温差作用的影响。采用线性热弹性理论推导出圆钢管混凝土在柱坐标下的二维热应力基本方程。结合工程实例,采用热应力有限元法分析了圆钢管混凝土在夏季和冬季温差作用下的变形特征与应力状态。分析结果表明,季节温差对于钢管混凝土的膨胀性能设计不可忽略,它应该与混凝土的收缩徐变、荷载水平、膨胀剂特性等因素耦合作用来开展钢管膨胀混凝土的性能设计。
Expansive performance of concrete filled steel tubes was designed to compensate the early-age shrinkage deformation of concrete, but often ignored effects of seasonal temperature difference. In this paper, the basic equation of the two-dimensional thermal stress was derived in cylindrical coordinate system by use of the linear thermal elasticity theory. Based on an example of project, the finite element analysis of thermal stress is conducted to investigate the stress and deformation character- istics of the concrete filled circular steel tube in the summer and winter temperature difference respectively. The results show that the seasonal temperature difference cannot be ignored for the expansion design of concrete filled steel tubes, and should be considered to be coupled with the shrinkage and creep of concrete, load level, the expansive agent for performance-based design of expansive concrete filled steel tubes.
出处
《武汉理工大学学报》
EI
CAS
CSCD
北大核心
2008年第7期43-45,133,共4页
Journal of Wuhan University of Technology
基金
国家自然科学基金(50508034)
关键词
钢管混凝土
膨胀率
热应力
有限元
concrete filled steel tubes
expansive rate
thermal stress
finite dement
