FRP加固圬工拱桥的性能分析

Analysis of the Performance of FRP Reinforced Masonry Arch Bridge

为了研究FRP加固圬工拱桥的破坏模式、荷载能力以及变形能力,采用分离式建模的方法,以FRP类型、FRP宽度和加固位置为变量,建立了FRP加固圬工拱桥的有限元模型。结果表明,FRP加固圬工拱桥,都改变了四铰机制的破坏模式,避免了圬工拱桥的脆性破坏;FRP粘贴宽度越大,拱腹加固的荷载能力和变形能力越大,拱背加固的荷载能力也越大,但增幅很小,延性并没有得到很好的改善;拱腹加固的荷载能力大于拱背加固的荷载能力,而拱背加固的变形能力大于拱腹加固的变形能力。

In order to study the failure mode of FRP reinforced masonry arch bridge, the load capacity and deformation ability, the meth- od of separate modeling were built some FRP reinforced masonry arch bridge finite element models. FRP type, FRP width and rein- forcement position are thought of as variables. The results indicated that the fracture mode of the four-hinged mechanism is changed at the intrados or at the extrados pasted FRP to strengthen the masonry arch bridge, the larger the pasting width of FRP, the greater the load capacity and deformation ability of the arch abdominal reinforcement, and the greater the load capacity of the arch back reinforce- ment, but the increase is small, and the ductility is not improved very well. The load capacity of the arch-abdominal reinforcement is greater than the load capacity of the arch-back reinforcement, and the deformation ability of the arch-back reinforcement is greater than the deformation ability of the arch-abdominal reinforcement.