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Storey stability of unbraced steel frames subjected to non-uniform elevated temperature distribution

机译：高温分布不均匀的无支撑钢框架的储层稳定性

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摘要

Current studies on stability of steel frames are primarily based on the assumption that steel columns are subjected to uniform elevated temperature. However, the temperature distribution of real fire in a building may be non-uniform due to thermal buoyancy effect. In this study, the elastic stability of unbraced steel frames subjected to a non-uniform elevated temperature distribution along the longitudinal direction of the column is investigated based on the concept of storey based buckling and a two zone fire model. First, to simulate a steel column exposed to non-uniform elevated temperature, an analytical model is proposed to examine the effects of axial loading, non-uniform elevated temperature distribution, and thermal boundary restraints on the lateral stiffness of steel columns in unbraced frames. The lateral stiffness equation of the column model is derived based on Euler-Bernoulli beam theory. Then, the procedure to evaluate the stability capacity of unbraced steel frames subjected to non-uniform elevated temperature distribution is concluded. Numerical examples are presented to demonstrate the evaluation procedure of the proposed method and investigate the frame stability subjected to different scenarios of frame members exposed to the non-uniform elevated temperature distribution. The validity of the proposed method is verified by the numerical analysis with the use of finite element analysis.
机译：当前对钢框架稳定性的研究主要基于钢柱承受均匀高温的假设。但是，由于热浮力效应，建筑物中真实火灾的温度分布可能不均匀。在这项研究中，基于基于层屈曲的概念和两区火灾模型，研究了沿竖向纵向温度分布不均匀的无支撑钢框架的弹性稳定性。首先，为了模拟暴露在不均匀高温下的钢柱，提出了一个分析模型来研究轴向载荷，不均匀升高的温度分布以及热边界约束对无支撑框架中钢柱的侧向刚度的影响。基于欧拉-伯努利梁理论推导了圆柱模型的侧向刚度方程。然后，总结了评估非支撑钢框架承受不均匀高温分布的稳定能力的程序。数值算例表明了该方法的评估过程，并研究了框架构件在不同温度下暴露于非均匀高温分布的情况下的框架稳定性。通过有限元数值分析，验证了所提方法的有效性。

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