摘要
为了探索约束钢梁的高温性能及不同温度路径和参数的影响,本文采用大型有限元程序ANSYS对四种不同温度路径和四个不同参数下约束钢梁的性能反应进行分析研究。计算时充分考虑了高温引起的材料非线性和几何非线性,其中钢材的力学和物理性能指标随温度升高的变化系数按照欧洲规范(EUROCODE3)取用。本文首先对两端固定约束钢梁在温度连续升高时的性能反应进行了分析,并将分析结果与已有研究成果进行对比,验证了本文分析方法的正确性。在此基础上,又对升温-降温、升温-恒温-降温、升温-降温-升温等不同温度路径下约束钢梁的性能进行分析,研究了不同温度路径对钢梁高温性能的影响。最后探索了降温速率、历史最高温度、降温最低温度以及升降温循环次数等参数对约束钢梁性能反应的影响。
To understand the behavior response of restricted steel beams under high-temperature and the influence of different heating/ cooling routes and parameters, the finite element program ANSYS was used to analyze eight models with four different heating/cooling routes and four parameters. The material nonlinearity and geometrical nonlinearity being aroused by high-temperature are taken into account adequately during computation, in which the coefficients of material mechanical and physical properties, changing with elevating temperature, are adopted according to EUROCODE3. Firstly, the analysis is carried out to study the response of the restricted steel beam under durative heating-up, and the result is compared with existent one to test the validity of the analysis method used in this paper. And then, based on the first step, the other different routes of heating up-cooling, heating up-constant temperature-cooling, heating up-cooling-heating up are also researched respectively, and the influence of different heating/cooling routes on the properties of the restricted steel beam is studied. Lastly, the influencing parameters of the cooling rate and historically highest temperature in heating up-coolingroute, the lowest temperature in heating up-cooling-heating up route and the cycle index of heating up-cooling alternation are also discussed separately.
出处
《建筑科学》
北大核心
2009年第5期14-18,22,共6页
Building Science
基金
国家自然科学基金资助项目(50578093)
关键词
约束钢梁
性能反应
温度路径
参数影响
位移振荡
restricted steel beam
behavior response
heating/cooling route
parameter influence
displacement fluctuation
