一种结合FRP新型拱桥的承载性能试验研究

Experimental Study on Bearing Capacity of a Novel Arch Bridge with FRP

建立了一种结合纤维复合增强材料(简称FRP)和柔性混凝土拱圈的新型装配式圬工拱桥体系,并获得专利授权,相对于传统圬工拱桥,该结构体系预制化程度和耐久性得到较大提高,施工难度较低并有着较高施工效率。在前期研究基础上,为提高该预制结构承载能力及变形能力,采用FRP布对拱腹进行粘贴,延缓拱体内拱块之间分离。研究中通过结构试验对两座新型圬工拱桥模型进行了极限承载力试验,以验证外贴FRP材料对该预制拱桥结构性能的影响,包括拱轴线线形、拱腹FRP布应力和结构承载力等。试验结果表明,外贴FRP布的结构极限承载力明显提升,破坏形态为FRP布剥离后拱块相互滑移开裂和远加载端拱脚开裂。最后通过建立Midas/Civil有限元模型进行计算分析得知,新型拱桥极限承载力远大于传统圬工拱桥。

A system of flexible masonry arch bridge with the fiber reinforced polymer has been developed in this study and the related patent is awarded.The prefabricated degree and durability of the structure system has been improved greatly and the difficulty of construction is relatively low compared with the traditional masonry arch bridge.On the basis of preliminary study,in order to delay the separation between the arch block,the soffit has bonded by the high performance fiber reinforced polymer（FRP）cloth to improve the bearing capacity.To verify the effect of FRP on the structure of externally bonded material performance of the prefabricated arch bridge,the ultimate bearing capacity on two portable masonry arch bridge model is tested in study,including the arch axial line types,the stress of CFRP sheet on arch soffit and the bearing capacity of structure.The test results show that the bearing capacity has improved significantly compared with the early structure,the destruction pattern is cracking because of sliding of arch block after the CFRP sheet strips and the arch leg far from the loading is cracking.The bearing capacity of novel arch bridge is significantly larger than that provided by the traditional masonry arch construction through the calculation of finite element model with MIDAS civil.