施工期FRPM管的变形率对管涵力学性能的影响研究  

Study on the influence of constructing deformation rate on the mechanical properties of FRPM pipe culverts

作　　者：王嘉诚 孙超 胡立周 贾莹洁 王清洲 WANG Jiacheng;SUN Chao;HU Lizhou;JIA Yingjie;WANG Qingzhou(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300000,China)

机构地区：[1]河北工业大学土木与交通学院,天津300000

出　　处：《复合材料科学与工程》2024年第11期92-99,共8页Composites Science and Engineering

基　　金：河北省交通运输厅科技项目(202315)。

摘　　要：为了探究公路浅埋玻璃纤维增强塑料夹砂(FRPM)管涵洞施工阶段产生的累积变形对服役期承载能力的影响,结合管涵在路基填土施工阶段的现场荷载试验,建立了柔性FRPM涵洞的管-土相互作用数值计算模型,仿真研究三种填土高度、三种施工变形率对管涵环向应变、von Mises应力和管周土压力等力学参数的影响规律。结果表明,随着管涵变形率的增长,涵洞发生不规则的椭圆化形变,其受力模式由整体均匀受力转变为管涵上半部分尤其是管顶区域集中受载,涵顶范围内成为受力的最不利区域。在相同填土高度下,管涵的环向应变、von Mises应力值和管周土压力均随变形率的增大而显著增大,变形率越大,对管涵长期力学性能的不利影响越严重;填土厚度越大,涵洞所受交通荷载越小。施工阶段,通过管涵内部设置钢支撑装置等措施可有效减小涵洞变形率,有利于服役期内涵洞改善受力和提高耐久性。In order to explore the influence of cumulative deformation from the constructing shallow buried glass fiber reinforced plastics mortar(FRPM)pipe culverts on the carrying capacity during the service period,a numeri cal calculation model of pipe-soil interaction for flexible FRPM culvert was established based on the field load test of the culvert in the subgrade filling constructing period.The effects of three different filling heights and three kinds of deformation rate on mechanical parameters such as circumferential strain,von Mises stress and earth pressure a round pipe were studied through simulation.The results illustrate that the culvert has irregular ellipticity with the in crease of the culvert deformation rate.Its stress mode changes from the circumferential overall uniform force to the more concentrating load on the upper part especially in the top area of the culvert.At the equivalent filling height,the circumferential strain,von Mises stress and earth pressure around pipe increase significantly with the increase of the deformation rate,and the greater the deformation rate,the more severe the adverse effect on the long-term me chanical properties of the pipe culvert.Meanwhile,increasing the thickness of the fill reduces the burden on the cul vert.During the constructing period,the culvert deformation rate can be significantly reduced by setting steel support device inside the culvert,which contributes to improving the stress bearing mode and durability of culverts in the course of the service period.

关 键 词：FRPM管涵 变形率 施工期 管-土作用模型 力学性能 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]