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受高温影响的钢框架的侧向稳定性与其在环境温度下的稳定性不同。这是由于高温下钢框架的弹性模量的降级将导致柱的横向刚度也跟着减少。在楼层屈曲理论的基础上调查无支撑钢框架在高温下的横向稳定性。首先,模拟一个钢柱暴露于高温之下,提出一个分析模型来测试无支撑框架中的轴向载荷、高温以及受热边界限制的钢管的横向刚度所带来的影响。之后,提出一个评估无支撑钢框架在高温下的稳定承载力的方法。数值实例用于展示所提出的方法的评估过程,并且研究不同场景中框架构架暴露于高温时框架结构的稳定性。使用有限元分析对所提出方法进行了数值分析,验证了该方法的有效性。
Lateral stability of steel frames subject to high temperatures is different from their stability at ambient temperatures. This is due to the degradation of the elastic modulus of the steel frame at high temperatures, which leads to a decrease of the column transverse rigidity. Based on the theory of floor buckling, the lateral stability of unsupported steel frame under high temperature was investigated. First, simulate a steel column exposed to high temperatures and propose an analytical model to test the effect of axial stiffness in unsupported frames, high temperatures and the transverse stiffness of steel tubes limited by the heat boundary. Later, a method to evaluate the stability of unsupported steel frames at high temperatures was proposed. The numerical examples are used to demonstrate the evaluation process of the proposed method and to investigate the stability of the frame structure when the frame structure is exposed to high temperatures in different scenarios. The proposed method is numerically analyzed using finite element analysis to verify the effectiveness of the proposed method.