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.
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)
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
steel column under axial compression
after fire
stability bearing capacity
heterogeneous ma-terial
equivalent section method
