基于SAP2000的四角锥网架结构动力特性反应分析

Dynamic Response Analysis of four Pyramid Grid Structure Based on SAP2000

文章利用有限元软件SAP2000建立了结构有限元模型,对不同支撑形式的四角锥网架结构进行了模态分析,比较了不同支撑形式的自振周期、振型变化、支撑形式对轴力的影响、不同场地类别对轴力的影响。分析结果表明,四边支撑形式的周期最小,四点支撑形式的水平变形最大。通过对不同支撑形式的分析,得到竖向地震作用下双边支撑形式弦杆的动力响应最小。对不同场地类别的地震反应分析,得到在不同特征周期作用下腹杆的轴力最大,结构的竖向地震作用大于水平方向的地震作用。

A structure finite element model is established with a finite element analysis software SAP2000,the different support forms of pyramid space truss structure modal are analyzed,and the different supporting forms of self vibration period and the vibration type changes are compared.The analysis results show that the period of the four sides support is the smallest,and the level of the four points support is the maximum.The dynamic response of the double pole under vertical earthquake action is the minimum through the vertical seismic action.The seismic response analysis of different site types was obtained in the different characteristics of the axial force of the lower abdomen,the vertical seismic action of the structure is greater than the horizontal direction.