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基于国产奥氏体S30408不锈钢材料,针对轴心受压H形截面不锈钢柱,采用高温稳态分析和瞬态分析两种方法对其抗火性能开展了有限元数值模拟分析,揭示了不锈钢柱高温下受力性能与破坏模式。通过高温稳态分析,给出了不同温度下不锈钢柱的荷载-位移曲线及极限承载力-温度曲线;通过高温瞬态分析,研究了特定火灾升温模式下不锈钢柱表面温度的变化规律,给出了不同荷载比下不锈钢柱的临界温度;并将两种方法的计算结果与《欧洲规范》(EN1993-1-2)的计算结果进行对比分析。在此基础上,分别采用高温稳态分析和瞬态分析方法,对不锈钢柱的抗火性能开展了参数化分析,着重考察了构件初始缺陷、荷载比、截面尺寸以及长细比对高温下极限承载力和临界温度的影响。研究结果表明:构件的长细比和截面尺寸为轴心受压H形截面不锈钢柱高温极限承载力的主要影响因素,荷载比为不锈钢柱临界温度的关键因素,初始缺陷对不锈钢柱的抗火性能影响不明显。
Based on domestic austenite S30408 stainless steel, the axial compression H-section stainless steel columns were analyzed by finite element method with steady state analysis and transient analysis. The results show that the high temperature Under stress performance and failure mode. Through steady-state analysis at high temperature, the load-displacement curves and ultimate bearing capacity-temperature curves of stainless steel columns at different temperatures are given. The variation of surface temperature of stainless steel columns under a specific fire heating mode is studied by high temperature transient analysis. The critical temperatures of stainless steel columns with different load ratios were compared. The calculated results of the two methods were compared with those of the European Standard (EN1993-1-2). On this basis, the parameter analysis of the fire resistance of the stainless steel column was carried out by steady-state high temperature analysis and transient analysis respectively. The initial defects, load ratio, cross section size and slenderness ratio of the stainless steel column were investigated. Bearing capacity and critical temperature. The results show that the slenderness ratio and cross-sectional dimension of the component are the main factors affecting the ultimate high temperature ultimate bearing capacity of the H-section stainless steel column. The load ratio is the key factor of the critical temperature of the stainless steel column. Performance is not obvious.