摘要
为了比较不同荷载-温度路径下钢框架的性能反应,采用大型有限元程序ANSYS对4种不同路径下单层单跨钢框架的变形规律及应力分布规律进行分析.计算时充分考虑了高温引起的材料非线性和几何非线性,其中材料力学和物理性能参数随温度的折减系数按照欧洲规范(EU-ROCODE3)取用.通过计算分析得到各种路径下框架梁跨中位移随外荷载或温度的变化规律,并对不同路径下的计算结果进行分析比较,定量给出了不同路径下温度产生的框架梁跨中位移在整个位移值中所占的比例.提出单层单跨钢框架在不同荷载-温度路径下的性能反应完全不同,框架最终变形及其受温度的影响程度也有很大差别,进行计算时应视实际情况区别对待.
To compare the behavior of steel frame under different load temperature paths, the finite element program ANSYS was used to analyze the deformation rule and stress distributing rule of one story-one span steel frame under four different paths. In the process of computation, material nonlinear behavior and geometry nonlinear behavior are taken into account. The material behavior at high temperature was used according to EUROCODE3. By analysis, the trend that mid span displacement of beam changes with load （or temperature） was obtained, the results gotten from different paths were compared with each other, and the ratios of displacement caused by temperature to gross at the middle-span of beam under different paths were presented quantitatively. It is concluded that the performance response of steel frame is different completely under different load-temperature paths, the final deformation and its effect degree of temperature are also different, computation should be carried out diacritically according to practical situation.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2008年第6期971-974,共4页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目(50578093)
关键词
钢框架
材料非线性
几何非线性
高温
荷载-温度路径
steel frame
material nonlinear
geometry nonlinear
high temperature
load-temperature path
