中间开孔弦支穹顶结构水平地震作用瞬态动力响应分析

TRANSIENT DYNAMIC RESPONSE ANALYSIS OF THE SUSPENDOME STRUCTURE WITH CENTRAL OPENING UNDER HORIZONTAL EARTHQUAKE ACTION

基于瞬态分析基本理论,选取适当地震波,对结构进行瞬态动力响应分析,利用有限元软件ANSYS建立三维空间模型,对模型输入水平方向的地震加速度数据,分析结构5个主要部位位移节点随时间的变化规律以及位移最值位置和等效应力。分析结果表明:在水平方向地震波激励下,结构的最大水平位移位置发生在中央环处,最大竖向位移发生在最内环支座约束处,且最大水平位移与最大竖向位移大小接近,因此分析结构动力响应时水平和竖向位移都需要考虑,Mises等效应力小于材料的屈服强度,说明整体结构具有较好的抗震性能。

Based on the basic theory of transient analysis,the appropriate seismic wave was selected to analyze the transient dynamic response of the structure. A three-dimensional space model was built by using the finite element software ANSYS. The horizontal acceleration data of the model were input,and the displacement of the five main parts of the structure was analyzed over time. The change law and the optimal displacement position and equivalent stress were analyzed. The analysis results showed that the maximum horizontal displacement of the structure occurred at the central ring under the horizontal excitation of the seismic wave,and the maximum vertical displacement occurred at the innermost ring bearing constraint,and the maximum horizontal displacement was close to the maximum vertical displacement. The horizontal and vertical displacements of the structural dynamic response should be taken into account in structural dynamic response analysis. The equivalent stress was less than the yield strength of the material,indicating that the overall structure had a strong seismic behavior.