大跨度桥梁桥面铺装温度效应仿真分析

针对环境温度变化对桥面铺装层受力的影响,提出了一些计算假定.以某高墩大跨连续刚构桥为研究对象,分析了温度变化对铺装层受力的影响.用整体温度变化来模拟年温差的影响,采用有限元的方法计算出温度变化引起的主梁挠度,拟合成挠度曲线,并由微元体的平衡条件导出了铺装层应力和层间剪应力的计算公式并得出相应的应力值;用局部温度变化来模拟昼夜温差的影响,采用先整体后局部的分析方法计算出铺装层内的应力.计算结果表明:在整体温度变化作用下铺装层的应力因其材料不同而异;在局部温度变化作用下铺装层内的应力受铺装层与主梁间的温差影响较大.

The emulation analysis to the temperature effect of the bridge deck pavement of long-span bridge

Aiming at the stresses in the pavement are influenced by temperature variation,this paper puts forward some calculation suppositions to analyze the stress characteristic of the deck pavement.Taking a continuous rigid frame bridge of high pier and long span as an example,the stress characteristic of the deck pavement was analyzed.The change of bulk temperature is used to establish the recursion equation to simulate the influence of year temperature difference.Calculating the deflection of the main beam which is influenced by temperature variation and fitting the deflection curve,some calculation formula of deck pavement stress and the inter-layer shearing stress between the deck pavement and the main beam are educed due to the balance condition of the pavement micro segment.The change of local temperature is employed to simulate the influence of diurnal difference in temperature and the stress of the deck pavement was calculated by making global analysis before partial analysis.The result shows that the stresses in the pavement are influenced by the different materials of the pavement under the change of bulk temperature;the stresses in the pavement are influenced by the temperature different of the pavement and the main beam under the change of local temperature.