钢管混凝土轴压构件徐变有限元研究  

Finite Element Analysis on the Creep Behavior of Axially-Compressed Concrete Filled Steel Tube Members

作　　者：冯伟[1] 查晓雄[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院,广东深圳518055

出　　处：《建筑钢结构进展》2011年第1期49-56,共8页Progress in Steel Building Structures

摘　　要：在高层和超高层建筑中采用钢管混凝土结构,可充分利用空钢管所具有的强度和刚度,并能较好地解决混凝土硬化时间较长与施工速度之间的矛盾。但由此也会带来这样的问题,即在结构施工过程中,构件所受长期荷载随施工过程逐渐增加,徐变持续发展,混凝土卸载,内力重新分布,导致构件稳定承载力降低。本文运用DirichLet级数建立管内混凝土徐变模型,并应用非线性有限元软件ABAQUS对钢管混凝土徐变以及承载力进行了有限元计算,较好地模拟了钢管混凝土的徐变过程。本文回归分析了钢管混凝土的徐变性质,并认为可以用初应力的方法粗略估计徐变构件对承载力的影响。The use of concrete filled steel tubular （CFST） structures in high-rise building can well solve the conflict between the long time of concrete hardening and the requirement of fast construction speed,and make full use of the strength and sTIF;%95%92;X＊4fness of the hollow steel tube. But it also brings such problems,during the construction process of the structure,the CFST members suffered gradually increased long-term load,which makes concrete creep sustainably developing,concrete unloading,internal forces re-distributing,resulting in lower load-carrying capacity of the CFST members. By adopting DirichLet series in the concrete creep model,this paper applied the nonlinear FEM software ABAQUS in simulating the creep process of CFST members and testing their load-carrying capacity; the FEM results are validated to be reliable and accurate. A parametric study is then conducted to investigate the creep behavior of CFST members. It is concluded that the initial stress can be introduced to roughly estimate the effect of creep on axially load-carrying capacity.

关 键 词：钢管混凝土 徐变 有限元 承载力 

分 类 号：TU375[建筑科学—结构工程] TU392.3