椭圆形钢管混凝土柱的抗火性能

采用非线性三维有限元模型,分析了轴向压力下椭圆形空心钢管混凝土(CFEHS)柱的抗火性能。本研究基于作者关于空心钢管混凝土(CF-CHS)柱在室温下性能和抗火性能的研究成果,用文献中CFEHS短柱在室温下的数据验证数值模型,然后将数值模型应用于CFEHS细长柱在高温下性能的研究。研究目的是为理解并阐述轴向压力下CFEHS柱在火灾中的性能,并将其有效性与圆形钢管混凝土(CFT)柱进行了对比。研究了柱长细比、荷载大小、横截面长细比和截面面积大小等不同参数对柱性能的影响。最后给出了CFEHS柱的设计建议:采用EN1994-1-2第4.3.5.1条导则设计,但是应采用基于法国规范附录椭圆截面有效直径的抗弯刚度折减系数。椭圆截面有效系数等于P/π(P为椭圆周长)。

Fire Behaviour of Concrete Filled Elliptical Steel Columns

In this work,a non-linear three-dimensional finite element model is presented in order to study the behaviour of axially loaded concrete filled elliptical hollow section(CFEHS) columns exposed to fire.This study builds on previous work carried out by the authors on concrete filled circular hollow section(CFCHS) columns both at room temperature and in fire.The numerical model is first validated at room temperature against a series of experiments on CFEHS stub columns available in the literature and subsequen...