不明资料的旧桥加固设计

Reinforcement of an Old Bridge Without Original Data

在原桥设计图纸已丢失的情况下,通过反算法对原桥结构进行内力计算,并以距支座L/4和L/2处截面为控制截面进行配筋计算,认定原结构实际配筋与反算配筋量相符合,以此控制截面在汽-20与汽-10作用下的弯矩差值ΔM作为加固设计CFPR的依据,在梁底进行粘贴碳纤维布加固设计。

To an unidentified bridge whose design drawings have been lost, the paper suggests a way to reinforce it. First, the back calculation method is used to obtain the intemal force of the bridge, and L/4 and L/2 are considered as the controlling cross-sections to calculate the amount of the reinforcing steel bar. Then,considering the agreement between the actual reinforcement and the calculated reinforcement, the paper employs ΔM that is caused by the differences between car-20 and car-10 at the controlling sections to be the basis of the reinforcement and suggests reinforce the bridge by bonding carbon fibers under the beams.