网架设计软件STADS的计算风工程开发——风振分析

Computational Wind Engineering Development of Space Grid Design Software STADS——Wind Vibration Analysis

在大跨空间网架结构中,风荷载往往起决定作用,而风致振动是许多大跨空间网架结构在强风作用下破坏的主要原因之一,风荷载作用下结构的风振响应可通过风振系数确定。数值风洞具有成本低、周期短、效率高的优点,成为不少学者模拟风场获取结构表面风压的常用方法。进行网架辅助设计软件STADS与FLUENT软件接口程序的风振分析设计,通过STADS进行模型转换,基于大涡模拟(LES)控制FLUENT软件的风工程计算功能进行瞬态风压计算,输出并转换为节点风压时程;通过动力时程分析,得到复杂网架结构的节点风振系数,为复杂体型网架结构抗风设计提供了参考依据。接口程序还可自动加载风振系数,减少手动输入,提高工作效率。

In the long-span space grid structure,wind load often plays a decisive role.Wind-induced vibration is one of the main reasons for the destruction of many large-span space grid structures under strong wind.The wind-induced response of the structure can be determined by the wind vibration coefficient.With the advantages of low cost,short cycle and high efficiency,numerical wind tunnel has become a common method for many scholars to obtain wind pressure of the structure surface by simulating wind field.The interface program between STADS and FLUENT is developed to analyse the wind-induced vibration,and the model is transformed through STADS.Based on the large eddy simulation(LES),the transient wind pressure is calculated by using the wind engineering calculation function of FLUENT,and the wind pressure time history is output and converted into the node wind pressure time history by it.Through the dynamic time history analysis,the node wind vibration coefficient of complex grid structure is obtained.It can provide some references for the wind-resistant design of grid structure with complex shape.The interface program can also automatically load the wind vibration coefficient,reduce the manual input and improve the working efficiency.