钢板墙-双肢C型钢框架简化模型

Simplified model for double C steel frames with steel plate wall

采用试验与有限元相结合的方法分析了钢板墙-双肢C型钢框架在低周反复荷载作用下的力学性能。在此基础上提出了一种构造简单、力学性能良好的四拉杆等效模型(FSEM)。通过FSEM模型分析了柱刚度系数、钢板墙高厚比和钢板墙高宽比,并与传统有限元模型结果进行了对比。结果表明,FSEM模型精度较高,静力计算时与传统壳单元模型的误差在10%以内,可以在设计中简化计算。提出了FSEM模型等效拉杆的倾角、截面面积计算公式,并建议该类框架钢板墙高厚比取600~1000,高宽比取0.5~1.0,柱刚度系数取79.6~99.5,为实际工程中的设计计算提供参考。

This paper present a description of tests and finite element analyses for the mechanical properties of the double C steel frames with steel plate wall under low frequency cyclic load.Based on this method,a new simple model named FSEM(Four Strip Equivalent Model)is proposed,which has a simple structure and good mechanical properties.It is found that FSEM model has better accuracy,the disparity between static calculation and traditional shell element model is less than 10%by the analysis of the column stiffness coefficient,the height-thickness ratio and the height-width ratio of the steel plate wall.Formulas for calculating inclination and section area of equivalent pull rod in FSEM model are presented.It is suggested that the height-thickness ratio of this kind of frame steel plate wall should be between 600 and 1000,height-width ratio of steel plate wall should be between 0.5 and 1.0,and column stiffness coefficient should be between 79.6 and 99.5.It can be provide a reference for design calculations in practical engineering.