H型钢连接方钢管混凝土组合柱简化模拟方法

A Simplified Simulation Method of Concrete-filled Square Steel Tube Composite Column Connected By H-shaped Steel

为了简化H型钢连接方钢管混凝土组合柱(SCFT柱)的建模计算过程,建立了三种H型钢连接SCFT柱的有限元分析模型,分别为常用的实体单元模型以及基于轴向刚度和抗弯刚度等效的双梁-单壳单元简化分析模型,结合试验结果,进行了压弯状态下的受力性能分析。基于实体模型和根据刚度等效换算的单梁-单壳单元模型、双梁-单壳单元模型,采用通用分析和设计软件MIDAS建立了典型SCFT柱框架,对比了三种模型在不同荷载下的响应。结果表明:三种模型得到的压弯状态下H型钢连接SCFT柱的破坏模式和承载力基本一致,且与试验结果吻合良好,SCFT框架自振特性、层间位移和柱底反力具有一致性,验证了简化分析计算模型结果的准确性,以及运用于结构分析计算的可行性。

To facilitate the simulation of concrete-filled square steel tube(SCFT)column connected by H-shaped steel,three types of models were established,including the simplified double-beam single-shell element models(based on the equivalent axial stiffness and bending stiffness)as well as the normal solid element model.The mechanical properties of models under compression and bending were discussed considering test results.On the basis of the solid element model and both the single-beam single-shell element model and double-beam single-shell element model converted by equivalent stiffness,the typical SCFT frame models were established by using the general analysis and design software MIDAS.The responses of these frame models were compared under different load conditions.The results showed that the failure modes and bearing capacity obtained by three models were consistent and in good agreement with the test results,and the natural vibration characteristics,story drift and column bottom reaction of SCFT frame were consistent,indicating the results of the simplified models were accurate and the simplified models of SCFT column based on the equivalent stiffness were proved to be feasible for structural analysis.