高寒强紫外线地区钢混组合梁桥面铺装结构温度‐荷载耦合作用分析

Analysis of temperature-load coupling effect of deck pavement structure of steel-concrete composite girder bridge in alpine and intensive ultraviolet region

为探索高寒强紫外线地区钢混组合梁桥面铺装的温度效应和应力、应变规律,优化区内钢混组合梁桥面铺装设计,依托青藏拉萨-那曲段高速公路,结合高寒强紫外线的气候条件建立了局部梁段温度场计算模型。针对5种典型的混凝土桥面铺装结构(双层AC、双层SMA、下层AC+上层SMA、下层GA+上层SMA和下层E A+上层SMA),研究了铺装层内温度分布规律,分析了桥面铺装结构在日内温度周期性变化下的温度应力。在此基础上,对桥面铺装的上表面施加均布荷载,研究了5类桥面铺装组合在温度-荷载耦合作用下的力学响应和蠕变变形情况。

In order to explore the temperature effect and the stress and strain laws of steel-concrete composite girder bridge deck pavement in alpine and intensive ultraviolet region and optimize the design of deck pavement with the steel-concrete composite girder bridge in the region,a temperature field calculation model of local beam section was established based on the section from Lhasa to Nagqu of the Qinghai-Tibet Expressway and combined with the climate conditions of alpine and intensive ultraviolet.Five typical concrete bridge deck pavement structures(double layer AC,double layer SMA,lower layer AC+upper layer SMA,lower layer GA+upper layer SMA and lower layer EA+upper layer SMA)were selected,the temperature distribution law in the deck pavement was studied,and the temperature stress under the condition with periodic change of intraday temperature of bridge deck pavement was analyzed.On this basis,a uniform load was applied to the upper surface of bridge deck pavement,the mechanical response and creep deformation of the five types of bridge deck pavement combinations under the coupling action of temperature-load was studied.