玻璃钢(GFRP)-混凝土复合拱试验研究

Experimental Study on the Structural Performance of GFRP-Concrete Composite Arch

在混凝土拱的不同位置、采用不同黏贴形式黏贴玻璃钢(GFRP)得到了6个GFRP-混凝土复合拱。对GFRP-混凝土复合拱进行了加载破坏试验,并对其破坏形式、荷载挠度曲线规律、刚度规律和承载力等结构性能进行了研究。试验表明:GFRP-混凝土复合拱开裂荷载更高,开裂前的刚度明显高于普通混凝土拱,开裂后其刚度及抗裂性能也明显优于普通混凝土拱;GFRP-混凝土复合拱具有更高的极限承载力和极限变形。GFRP-混凝土复合拱中,黏贴GFRP的范围较大时,GFRP-混凝土复合拱的力学性能更优;采用环形及U形黏贴GFRP的复合拱力学性能明显优于采用单面黏贴GFRP的复合拱,但全拱环形黏贴GFRP的复合拱性能并非最优。

By bonding GFRP in different locations of concrete arch,6 GFRP-concrete composite arches were gained.Through destructive test of the arches,the failure modes,load-deflection curves,structural stiffness and bearing capacities of GFRP-concrete composite arches were studied.The experiments showed that GFRP-concrete composite arch has a higher cracking load.Before cracking the stiffness of GFRP-concrete composite arch is higher than ordinary concrete arch.After cracking,the stiffness and crack resistance of GFRP-concrete composite arch are significantly higher than ordinary concrete arch.Also the bearing capacities and ultimate deformation of GFRP-concrete composite arch are higher.The composite arch boned with circular and U-shaped GFRP has superior mechanical performance to those which with single-side shaped GFRP.However,the performance of composite arch with total arch-shaped GFRP is not optimal.