【摘要】 近年来 ,对钢框架复合结构的抗火试验和理论研究结果表明 :直到结构破坏以前 ,控制结构在火中反应的是由热膨胀和热弯曲引起的应力及位移而不是材料性能的退化。给出了梁在受热膨胀和热弯曲作用时反应的基本原理 ,并在分析单个梁在热作用和周围结构约束共同作用下的反应基础上进行了阐述更多还原

【Abstract】 Recent experimental and theoretical researches on the composite steel framed structure show that it is the stress and displacement induced by thermal expansion and thermal bending and not the material degradation that govern the structural response under fire until just before failure. The paper attempts to lay down some of the most important and fundamental principles that govern the behavior of steel beam under fire in a simple and comprehensible manner. A description is also carried out based upon the analysis of response of single beam under a combination of thermal action and end restraint representing the surrounding structure.更多还原