摘要
用大型有限元分析程序ANSYS对不同荷载比下圆管桁架T形节点的临界温度进行了分析,分析计算时充分考虑了高温引起的材料非线性和几何非线性,其中钢材力学和物理性能参数随温度的降低系数按照欧洲规范(Eurocode3)采用。首先进行了节点模型在常温下的极限承载力计算,并将计算结果与我国现行规范方法的计算结果进行比较,验证了所采用ANSYS计算方法的正确性,然后把不同比例的常温极限荷载作为恒定的外荷载施加在节点上,分别计算其临界温度。通过分析得出不同荷载比下节点的临界温度和最大位移,并定量给出节点临界温度随荷载比的增加而降低的趋势和变化规律,总结了节点荷载比及相应临界温度近似线性的相关关系。
The critical temperature of T-shape circular tubular truss joint under different load ratio has been analyzed by ANSYS.In the process of computation,material nonlinear behavior and geometrical nonlinear behavior caused by temperature are taken into account thoroughly.The coefficient that material behavior decreases at high temperature relative to ambient is used according to Eurocode3.The bearing capability of tubular joint at ambient is computed first,and the results are compared with those calculated by current code in our country,which validates the ANSYS method used in this paper,then different ratio of load is added on the tubular joint as constant,critical temperature is computed under different load ratio.By analysis,the critical temperature and maximum displacement under different load ratio are obtained,the rule that critical temperature decreases with increased load ratio is presented quantitatively.The approximately linear relationship between load ratio and critical temperature is concluded.
出处
《工业建筑》
CSCD
北大核心
2008年第z1期476-478,共3页
Industrial Construction
关键词
圆管桁架
T形节点
火灾高温
临界温度
steel circular tube truss T-shape tubular joint high temperature critical temperature
