连续刚构桥收缩徐变对桥面铺装应力的影响

大跨径PC连续刚构桥梁的收缩徐变效应,容易诱发桥面铺装时所产生地各种病害。结合甘肃西长凤高速公路泾河特大桥,利用MIDAS/Civil软件计算泾河特大桥的短(长)期收缩徐变效应,分别建立了桥墩与跨中的局部模型,分析了收缩徐变对桥面铺装应力及其变化规律的影响。研究结果表明:收缩徐变的短期效益对桥面铺装影响明显;铺装结构产生较大的纵桥向拉应力,而剪应力较小;与跨中区域相比,桥墩处受收缩徐变影响显著。

Stress Analyses on Bridge Deck Pavement of Continuous Rigid Frame Bridge with Shrinkage and Creep

The shrinkage and creep effect of large span continuous rigid frame bridge is obvious,which produces all sorts of diseases on bridge deck pavement.Based on calculation of the shrinkage and creep effect of the Jinghe super bridge short(long) phase of by MIDAS/Civil,establishment of a bridge pier and mid-span local model through ANSYS respectively,analysis of the stress and laws of the deck and the changing with shrinkage and creep,the result shows that the short term effect on the bridge deck pavement is obvious;longitudinal direction tensile stress of pavement structure is large,and shear stress micro;compared to the deck on the local of mid-span,the pier region is significant for shrinkage and creep effects.