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以中国桥规中温度梯度为基础,通过有限元软件Midas/Civil模拟箱体结构温度场的不同程度改良,对比仿真分析连续刚构桥箱梁温度应力与挠度的分布规律及其改良幅度;研究了连续刚构桥各关键截面温度效应与温度梯度改良程度的相关性。结果表明:当箱梁的内外温差由原来的14℃改良到5℃时,箱梁的最大拉压温度应力以及桥梁结构的挠度,都将减小为原来的67%左右,改良幅度较明显;截面温度应力以及主梁挠度与温度梯度改良程度呈线性关系。
Based on the temperature gradient in Chinese bridge gauge, the finite element software Midas / Civil is used to simulate the varying degrees of the temperature field in the box structure. The distribution and change range of the temperature stress and deflection of the continuous rigid frame bridge are compared and analyzed. Correlation of Temperature Effect and Temperature Gradient Improvement of Key Rigid Frame Bridge of Continuous Rigid Frame Bridge. The results show that when the temperature difference between the inside and outside of the box girder is changed from 14 ℃ to 5 ℃, the maximum tension and compression temperature stress of the box girder and the deflection of the bridge structure will be reduced to about 67%, and the improvement range is obvious. Cross-section temperature stress and deflection of main girder have a linear relationship with the degree of temperature gradient improvement.