钢桁架拱结构固有振动分析

采用有限元分析软件ANSYS对一种钢桁架拱结构进行固有振动分析,同时将钢桁架拱看作倒置的劲性索结构,采用劲性索结构的分析理论--能量变分法分析这类结构的频率,并将得到的结果进行了比较.结果表明,把研究劲性索时推出的计算公式用于桁架拱结构的固有振动分析可取得较好的结果,具有很高的精度,基频误差一般在5%以内,为该类结构的抗震与抗风验算提供了一种新的思路和方法.

Natural vibration analysis of steel truss arch structures

Natural vibration of steel truss arch structures is analyzed base upon the large general structural analysis software ANSYS.With the new concept of upset stiff cable structure,frequency of this type of steel truss arch structures is determined by energy variational method.Results of two methods are compared and show that the presented frequency formulas are of high accuracy,and the differences of frequencies are all within 5%.This provides a new concept and method for evaluations of steel truss arch structures that resist earthquake and wind loads.