轴心受压钢柱火灾后稳定承载力研究  

Study on stability bearing capacity of steel column under axial compression after fire

作　　者：陈建锋[1] 周天华[1] 孙彬生 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]彬县房地产管理所,陕西咸阳713500

出　　处：《水资源与水工程学报》2013年第4期71-73,共3页Journal of Water Resources and Water Engineering

基　　金：中国博士后科学基金资助(2011M501428);中央高校基本科研业务费专项资金(CHD2012TD012)

摘　　要：轴心受压钢柱在经历火灾损伤后,构件截面材质呈现非均质力学性态,构件受力状态发生改变。为研究其火灾后剩余承载力,以工程中常用的H形截面轴心受压钢柱为研究对象,考虑高温后材料的强度变化、温度场不均匀对材料特性的影响,构件截面刚度退化等因素,采用等效截面法,分析了单面受火轴心受压钢柱火灾后的偏心效应。提出偏心距及附加弯矩的计算方法,进一步给出轴心受压钢柱火灾后剩余承载力计算公式,并通过算例分析,验证了该方法的合理性。该法不仅可用于单面受火轴压钢柱火灾后剩余承载力计算,也可为类似研究提供新思路。The section of steel column under axial compression presents the state of heterogeneous mechan- ics and its load condition changes after experiencing fire damage. Taking H-section steel column under axial compression commonly used in engineering for study object, in order to study the residual load bearing ca- pacity after fire and consider the strength change of the material after high temperature and the influence of non-uniform temperature field on material properties and the stiffness degradation of member section, the ec- centric effect of steel column under axial compression exposure to one-side fire was analyzed by using the method of equivalent section. The paper proposed calculation methods of the eccentricity and additional mo- ment and further given a formula of residual bearing capacity of the column after fire. The rationality of the calculation methods was verified by the analysis of a calculation example. The method can be used not only to calculate the stability bearing capacity of steel column exposed to one-side fire under axial compression after fire, but also to provide new ideas for similar studies.

关 键 词：轴心受压钢柱 火灾后 稳定承载力 非均质材料 等效截面法 

分 类 号：TU391[建筑科学—结构工程] TV314[水利工程—水工结构工程]