RC底框架结构中柱在火灾中的截面破坏型式

Section Failure Mode of RC Bottom Frame Interior Column in Fire

为评估RC底框架结构的耐火性能,利用实体火灾试验研究框架中柱的截面破坏型式。结果表明,底框架中柱在火灾中可能发生3种破坏型式:斜压破坏、压溃破坏和弯曲破坏,并分别分析了3种破坏型式的发生条件。探讨了轴心受压柱高温承载力计算公式的适应性,得出该计算方法可以适用于压溃破坏和弯曲破坏型式,但不适用于斜压破坏型式。

In order to evaluate the fire resistance capability of RC bottom frame,the section failure mode of its interior column had been studied,using the real fire tests. The results show that： There would be 3 kinds of section failure modes of interior column of bottom frame under fire,diagonal compression failure,crush failure,flexure failure,and analyses the condition that occur three kinds failure modes respectively. The thesis discussed adjustability of the calculate formula of which the carrying capacity for axes-compressed column under high temperature,the calculate method only fit with the modes of crush failure and flexure failure,but not suit for the modes of diagonal compression.