•  
  •  
 

Abstract

In response to the crack disease of the web plate and bottom plate of a fish-belly box girder bridge, numerical analysis and on-site investigation were adopted to study the crack shape, distribution law, and generation mechanism of the box girder, with a scheme for external prestress reinforcement proposed. Meanwhile, this paper introduced the overall layout of external prestress in the reinforcement design of the bridge, as well as the methods for setting anchoring blocks, turning blocks, and shock-reducing devices. The finite element calculation results and static load test results before and after reinforcement show that after the reinforcement, the structural strength, stiffness, and crack-resistance performance are all improved, confirming that the expected effect can be achieved by adopting external prestress active reinforcement. Relevant theoretical and experimental research can provide references for similar bridge reinforcement projects.

Publication Date

8-18-2022

DOI

10.14048/j.issn.1671-2579.2022.04.020

First Page

113

Last Page

117

Submission Date

May 2025

Reference

[1] 刘学青. 白马垄高架桥体外预应力技术研究[D]. 长沙: 中南大学, 2010. LIU Xueqing. Study on external prestressing technology of baimalong viaduct[D]. Changsha: Central South University, 2010. [2] 杨玉涛. 体外预应力加固技术在桥梁修复中的应用[J]. 北方交通, 2014(8): 37-40.YANG Yutao. Application of outside prestress reinforcement technology in bridge reparation[J]. Northern Communications, 2014(8): 37-40. [3] 吴有俊, 罗旗帜, 黄志斌. 新建鱼腹式连续箱梁开裂的处理与评价分析[J]. 中外公路, 2017, 37(3): 79-84.WU Youjun, LUO Qizhi, HUANG Zhibin. Treatment and evaluation analysis of cracks in new fish-bellied continuous box girder[J]. Journal of China & Foreign Highway, 2017, 37(3): 79-84. [4] 殷新锋, 王成煜, 黄屿, 等. 体外预应力桥梁转向块的受力性能分析[J]. 中外公路, 2017, 37(5): 100-103. YIN Xinfeng, WANG Chengyu, HUANG Yu, et al. Mechanical performance analysis of externally prestressed bridge steering block[J]. Journal of China & Foreign Highway, 2017, 37(5): 100-103. [5] 黎振源, 石菊创, 龙屹宇. 洛维大桥体外索加固前后试验及后期监测数据分析[J]. 中外公路, 2018, 38(4): 189-191.LI Zhenyuan, SHI Juchuang, LONG Yiyu. Rigid frame bridge test before and after reinforcement using the external cable and the monitoring data analysis[J]. Journal of China & Foreign Highway, 2018, 38(4): 189-191.

Download

Share

COinS