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对横截面上分布线性梯度温度场的双轴对称工字截面钢拱结构的侧向屈曲性能进行研究。钢拱结构存在面内线性梯度温度场,产生面内曲率,从而使结构伸长。继续提高温度差和平均温度,结构所受弯矩和轴向压力将增至临界值。此时,结构背离初始平衡位置,发生侧向扭转屈曲破坏。采用一种新型的非离散机械方法模拟屈曲前的钢拱性能,而采用经典屈曲理论确定弯曲-扭转屈曲的临界温度。本方法要求采用迭代法确定临界温度梯度和临界平均温度。通过全面参数分析,研究热梯度变化和临界温度。本模型能给出封闭解,可用于基于性能的钢拱结构耐火设计和分析。
The lateral buckling behavior of biaxially symmetric I-section steel arch structures with linear gradient temperature distribution in cross-section was studied. Steel arch structure exists in-plane linear gradient temperature field, resulting in surface curvature, so that the structure is elongated. Continue to raise the temperature difference and the average temperature, the structure of the bending moment and axial pressure will increase to the critical value. At this point, the structure deviates from the initial equilibrium position, lateral torsional buckling damage occurs. A new type of non-discrete mechanical method was used to simulate the behavior of steel arch before buckling. The classical buckling theory was used to determine the critical temperature of buckling-torsional buckling. This method requires the use of iterative methods to determine the critical temperature gradient and the critical average temperature. Through comprehensive parametric analysis, the thermal gradient changes and the critical temperature are studied. This model can give a closed solution and can be used for the fire-resistant design and analysis of steel arch based on performance.