网架结构温度作用取值及最不利工况确定

Selection Methods of Temperature Action Values and Most Disadvantageous Working Condition of Grid Structures

温度作用对大跨空间结构的影响不容忽视。由于温度作用的取值与地区有关,以乌鲁木齐站钢屋盖网架结构为工程实例,结合乌鲁木齐的气象数据及流场分析结果,提出不同类型温度作用的取值方法,然后将不同类型的温度作用分别加到结构的有限元模型中进行温度效应分析,依据结构的变形及受力情况得出极端日升温温差和极端年降温温差为最不利荷载,在以后的结构设计中应重点考虑,并用实测数据进行了验证。

The effect of temperature on long-span space structures cannot be ignored.Temperature effect values related to the area,taking Urumqi Railway Station steel roof space truss structure as engineering example,combined with Urumqi meteorological data and the result of flow field analysis,different types of temperature effect accessor methods were put forward,and then the different types of temperature effects were taken into account in structural finite element model for temperature effect analysis,according to the deformation and force of the structure,it was concluded that the extreme daily temperature difference and the extreme annual temperature difference were the most unfavorable loads,which should be considered in the future structure design.