预应力FRP网格加固空心板梁桥的病害修复效果分析OA北大核心CSTPCD

To address the typical disease concerns of hollow slab bridges,prestressed fiber-reinforced polymer(FRP)grid was used to strengthen hollow slab bridges,and the repair effects of the prestressed FRP grid on the diseases of bottom slab cracking and hinge joint damage were analyzed by numerical simulation.The effects of FRP grid type,strengthening amount,and layout direction on the load capacity of the bridge were discussed.The results show that excessive deflection and cracking can be successfully reduced by applying the prestressed FRP grid in the transverse or longitudinal direction to the bottom slab's cracked area.The detrimen-tal effects of hinge joint damage can be alleviated by applying the prestressed FRP grid transversely at the midspan.Transversely arranging the prestressed FRP grid allows for comprehensive strengthening when the two diseases are both prevalent.The strengthening effect of the basalt fiber-reinforced polymer(BFRP)grid is equal to that of the carbon fiber-reinforced polymer(CFRP)grid at the same prestressing level and strengthening amount.The diseases of bottom slab cracking and hinge joint damage can be successfully cured using prestressed FRP grid in a rational manner,contributing to enhanced long-term durability of the hollow slab bridge.