未设置加劲纵梁吊杆拱桥整治技术研究

Research on Reinforcement Technology of Suspender Arch Bridge Without Stiffening by Longitudinal Beams

加固后的吊杆拱桥结构体系发生改变,很可能导致其他安全隐患的出现,以高谷乌江大桥加固维修项目为依托,采用数值模拟的形式模拟原桥与加固桥不同位置处吊杆失效的突发情况,并计算最不利情况下各部件的受力状况。结果表明:加固后吊杆拱桥的吊杆应力分布更均匀,拱肋应力减小但横梁正截面弯矩、吊杆应力值与拱脚支反力增大;在吊杆失效的突发状况下,桥面板弯矩最大减小约31.69%,拱肋应力最大减小约2.11%,横梁正截面弯矩最大增大10.02%,未失效吊杆最大应力增大11.12%。

The structural system of the reinforced suspender arch bridge changes,which is likely to lead to the emergence of other potential safety hazards.Based on the reinforcement and maintenance project of the Gaogu Wujiang Bridge,this paper adopts the form of numerical simulation to simulate the sudden failure of the suspension rods at different positions of the original bridge and the reinforced bridge,and calculates the stress conditions of each component under the most unfavorable situation.The results show that:the suspender stress distribution of the suspender arch bridge after reinforcement is more uniform,the arch rib stress decreases but the bending moment of the normal section of the beam,the suspender stress value and the arch foot support reaction force increase;In the event of failure,the maximum bending moment of the bridge deck is reduced by about 31.69%,and the maximum stress of the arch rib is reduced by about 2.11%.The maximum bending moment of the normal section of the beam after reinforcement is increased by 10.02%,and the suspension rod is not failed,the maximum suspender stress is increased by 11.12%.