高速公路空心板桥加宽改造刚度渐变技术  

Construction technology of stiffness gradient for widening reconstruction of hollow plate bridge of highway

作　　者：李静斌[1] 陈淮[1] 李亚龙 

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]郑州市公路勘察设计院,河南郑州450006

出　　处：《铁道科学与工程学报》2013年第2期18-22,共5页Journal of Railway Science and Engineering

基　　金：河南省杰出人才计划项目(084200510003)

摘　　要：以京港澳高速公路空心板桥加宽改造工程为背景,采用有限元程序MIDAS/Civil建立某20 m跨径加宽空心板桥的空间有限元模型,对布设横向刚度渐变构件前后的加宽空心板桥静力性能进行分析。研究结果表明:布设横向刚度渐变构件前后的空心板桥在新旧桥板过渡区域的位移曲线有显著区别,布设横向刚度渐变构件前,新板和旧板之间出现较大的刚度突变,引起位移曲线突变;布设横向刚度渐变构件后,各块桥面板的位移曲线呈现逐步平缓变化的趋势;布设横向刚度渐变构件前加宽空心板桥的荷载横向分布系数峰值明显,表现出显著的单板受力现象;布设横向刚度渐变构件后,加宽空心板桥的荷载横向分布系数峰值减小,表明所承受的集中荷载由多块桥板共同承担;对比布设横向刚度渐变构件前后加宽空心板桥的静力性能,证明了布设横向刚度渐变构件的有效性,横向刚度渐变效果良好。The hollow slab bridge widening reconstruction of Beijing--Hongkong--Macao highway was taken as the engineering background. A spatial finite element model of the 20 m span widening hollow slab bridge with new slab is established by adopting the finite element program MIDAS/Civil. The analysis of static mechanical properties of the rigidity gradient hollow slabs were carried out. The calculation results show that the displace- ment curve on the new and old hollow slab transition region exists great difference before and after using lateral rigidity gradient components. There is a significant rigidity saltation between the new and old slabs, which in- duces displacement sahation. The displacement of each bridge slabs exhibites the trend of gradual change after u- sing lateral rigidity gradient compoments. Furthermore, the load transverse distribution coefficients of hollow slabs presents a peak value distinctly before using lateral rigidity gradient components, i.e. its mechanical be- haior can be regarded as single beam. When as after that, the salience value of load transverse distribution coef- ficients of hollow slabs decreases, which indicates that the concentrated loads are bore by multi slabs. The com- parison of static mechanical properties before and after using lateral rigidity gradient components proves that it has excellent gradient effect of lateral rigidity and shows great validity.

关 键 词：空心板桥 加宽改造 刚度渐变 静力性能 有限元分析 

分 类 号：U445.74[建筑科学—桥梁与隧道工程]