摘要
在高温下,材料的热工性能随温度变化而变化,为了对钢管混凝土耐火性能进行理论分析,了解高温下钢管混凝土的承载力及变形变化规律,首先必须分析钢管混凝土的温度场。高温下混凝土中的自由水汽化、水化物和凝胶等发生分解,这些物理化学反应将吸收热能,从而造成温度滞后。在合理地确定了火灾情况下钢管混凝土柱受火模型的基础上,应用有限元程序ANSYS,假定钢管和混凝土完全接触,采用增大混凝土比热的办法考虑温度滞后的现象,可以较准确计算四面均匀受火下钢管混凝土柱的温度场。其研究工作有助于进一步深入认识钢管混凝土柱在高温下的力学性能和耐火极限。
Thermal behaviours of materials vary with temperature. In order to analyze performance, ultimate strength and deformation of concrete filled steel tube（CFST） under high temperature, temperature field is investigated first. On the basis of the reasonable definition of column＇s surface temperature in fire,finite element method is adopted to calculate the temperature field of concrete filled steel tubes under high temperature by magnifying specific heat of concrete to consider the physical or chemical reaction in concrete which makes temperature lag behind. The calculated results are in good agreement with the test results by adoption of finite element method. The work in this paper makes it possible for further researches on the behavior and fire resistance of concrete filled steel tube.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2005年第5期32-35,共4页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(50078007)
湖南省自然科学基金资助项目(03JJY3089)
关键词
钢管混凝土
火灾
温度场
非线性有限元
concrete filled steel tube
fire
temperature field
nonlinear finite element
