钢结构建筑钢板外部震动下承载力有限元分析

Finite Element Analysis of the Bearing Capacity of Steel Plates in Steel-structure Buildings under External Vibration

传统钢结构建筑钢板外部震动下承载力分析方法,是基于总体钢板结构以及受力特征,获取载荷同振动频率间的关系,实现承载力的分析,并未对钢板同混凝土间的应力-应变关系进行分析,导致分析结果存在较高的偏差。提出新的钢结构建筑钢板外部震动下承载力有限元分析方法,将钢结构建筑钢板横截面简化成混凝土的矩形截面和波纹钢板的工字形梁截面,采用ANSYS有限元软件中的CONTACI2接触单元仿真分析钢板同混凝土两者的影响,分析混凝土及钢板的应力-应变关系、界面模块的应力-滑移关系,采用力平衡迭代法获取外部震动下钢板荷载增量;在上述基础工作上采用有限元软件,对外部震动下钢结构建筑钢板实施有限元接触单元建模及承载力分析。实验结果表明,该方法能够实现钢结构建筑钢板外部震动下承载力有限元分析,并且分析结果具有准确性高和效率高的优点。

The traditional method for the analysis of the bearing capacity of steel plates in steel structures under external vibration analyzes the overall steel plate structure and stress characteristics to obtain the relationship between load and vibration frequency.This approach,however,provides results with high deviation because it ignores the stress-strain relationship between the steel plate and the concrete.A novel finite element analysis method for the analysis of the bearing capacity of steel structure plates under external vibration is proposed.The cross-section of the steel structure plate is simplified to the rectangular section of the concrete and the I-section of the corrugated steel plate.The interaction between the steel plate and the concrete is simulated and analyzed with the CONTACI2 contact element in ANSYS finite element software.The stress-strain relationship of the soil and steel plate and the stress-slip relationship of the interface module are analyzed.The load increment of the steel plate under external vibration is obtained through the force balance iterative method.Then,the finite element method is used to analyze the bearing capacity of the steel structure plate under external vibration.Experimental results show that the proposed method can accurately and efficiently realize the finite element analysis of the bearing capacity of steel structure plates under external vibration.