【摘要】 直立锁边金属屋面系统风揭疲劳试验周期长且成本高,本文采取数值分析方法研究金属屋面的抗风揭疲劳性能。首先使用Abaqus软件对某金属屋面的静态风揭试验进行建模和模拟,得出该有限元方法静力学分析的合理性,之后采用Fe-safe进行疲劳寿命分析,从屋面尺寸和载荷谱风压两个方面设置工况并得出以下结论:直立锁边金属屋面破坏位置为屋面跨中、立板或卷边下端,改变尺寸参数使得构件上的最大应力减小可显著增加其疲劳寿命,四种参数中降低屋面板宽度和增加厚度更为有效;动态载荷谱风压的大小影响金属屋面的疲劳破坏方式,风压较低时屋面于立板处发生高周疲劳破坏;风压较高时,卷边下端塑性应变迅速增加并发生低周疲劳破坏,疲劳寿命较高周破坏时降低幅度较大。更多还原

【Abstract】 The wind-uplift fatigue test of metal roof system with vertical edge-locked has much time and high cost, so this paper adopted numerical analysis method to study the wind-uplift fatigue performance of metal roof. Firstly, Abaqus software was used to model and simulate the static wind-uplift test results of a metal roof, and the rationality of the static analysis was obtained. Then, Fe-safe was used to analyze the fatigue life. The working conditions were set from two aspects of roof size and load spectrum, and the following conclusions were drawn. The failure position of metal roof system with vertical edge-locked was the middle of the roof span, the vertical plate or the lower end of the rolled edge. Changing the size parameters to reduce the maximum stress on the component can significantly increase its fatigue life. Among the four parameters, reducing the width and increasing the thickness of the roof panel are more effective.The wind pressure of dynamic load spectrum affects the fatigue failure mode of metal roof. When the wind pressure is low, the high-cycle fatigue failure of roof occurs at the vertical plate. When the wind pressure is high, the plastic strain at the lower end of the hem increases rapidly and low cycle fatigue failure occurs, and the fatigue life decreases greatly when the cycle failure is high.更多还原