高层钢管混凝土结构施工全过程数值模拟

基于CEB-FIP MC90的混凝土时变模型,建立了按主从节点约束考虑钢管与混凝土共同工作的钢管混凝土时变分析模型,提出了高层钢管混凝土结构施工全过程的数值模拟方法。对某高层钢管混凝土结构进行了数值计算,计算中考虑了混凝土的收缩徐变效应和施工工序影响,与施工过程的监测结果做了对比分析。研究表明,施工过程和收缩徐变对高层钢管混凝土结构影响很大,实际结构在设计和施工中必须予以考虑。

Numerical Simulation on Whole Construction Process of High-Rise CFST Structures

The time-changing analysis model for concrete filled steel tubes was established based on the time-changing concrete model of CEB-FIP MC90,in which the interaction between steel tube and concrete core was considered by the restraint conditions of master and slave nodes.The numerical simulation method was developed for analyzing the whole construction process of high-rise CFST structures.A real structure was taken as numerical example,in which the influence of concrete creep and shrinkage as well as construction process was considered.The results of numerical simulation are compared with those obtained from on-site monitoring.It is shown that the concrete creep and shrinkage as well as construction process have big influence on high-rise CFST structures,which should be taken into account in designs and constructions.