双曲拱桥泡沫混凝土层上连续配筋混凝土板力学响应

摘要

为了研究双曲拱桥泡沫混凝土层上连续配筋混凝土板力学响应,运用等效方法将椭圆形车辆荷载转化为等效矩形荷载,建立了双曲拱桥连续配筋混凝土板全桥三维有限元模型并验证了模型的可靠性,分析了车辆荷载作用下连续配筋混凝土板的力学响应,确定了拉应力、剪应力和挠度最不利荷载位置.结果表明:相比均匀地基上连续配筋混凝土板,双曲拱桥上连续配筋混凝土板板底拉应力与顶部剪应力最不利荷载位置发生了改变,挠度最不利荷载位置不变;在双曲拱桥连续配筋混凝土板结构设计中,以纵缝边缘约1/4跨位置板底拉应力、横缝中间一侧靠中线位置板顶剪应力和纵缝边缘中部位置挠度为设计指标.分析结果为双曲拱桥不等厚基础上连续配筋混凝土板设计提供了理论基础.%In order to research the mechanical response of continuously reinforced concrete pavement on foam concrete interlayer for a two-way curved arch bridge,the elliptical vehicle load is translated into the rectangular load based on the equivalence method.Then,a three-dimensional finite element model of the whole bridge is established.The reliability of the model is verified.Additionally,the mechanical response of continuously reinforced concrete pavement under vehicle loading is analyzed.Finally,the most unfavorable loading conditions of tensile stress,shear stress and vertical displacement are determined.The results show that the most unfavorable loading condition of tensile stress,which is at the bottom of continuously reinforced concrete pavement on the two-way curved arch bridge,is changed compared with that on homogeneous foundation.The most unfavorable loading condition of shear stress at the top is also changed.However,the most unfavorable loading condition of vertical displacement remains unchanged.The tensile stress at the bottom of about 1/4 span of the longitudinal joint,the shear stress at the top of intersection of transverse and longitudinal joint,together with the vertical displacement at the central part of longitudinal joint,are taken as design indices during the structural design of continuously reinforced concrete pavement on the two-way curved arch bridge.The results are helpful for the design of continuously reinforced concrete pavement on unequalthickness base for the two-way curved arch bridge.