•  
  •  
 

Abstract

A prestressed concrete cast-in-situ continuous box girder bridge faces transverse cracking of the bottom plate of the second span and the overall stiffness decline.To address this issue,this paper analyzed the causes of the damage.A finite element damage model considering the reduction of section stiffness and prestress loss was established,and the new prestress reinforcement degree was reasonably determined according to the principle of envelope design.An internal and external prestress reinforcement scheme was proposed,which included adding a long internal bundle to the outer web and adding a partial short external bundle to the bottom plate of the second span.Through construction monitoring and comparison of load tests before and after reinforcement,the precompression stress reserve was restored;the overall stiffness was improved,and the reinforcement effect was good.The internal and external prestress reinforcement technology has the advantages of effectively improving the stress condition and increasing the overall stiffness of the structure.It has wide adaptability and can be used as a reference for reinforcement of other similar projects.

Publication Date

4-10-2025

DOI

10.14048/j.issn.1671-2579.2025.02.021

First Page

187

Last Page

193

Submission Date

April 2025

Reference

[1]胡承泽,宋重阳.体外预应力在某鱼腹式箱梁桥加固中的应用与研究 [J].中外公路,2022,42(4):113-117.HU Chengze,SONG Chongyang.Application and research of external prestress in strengthening of a fish-belly box girder bridge [J].Journal of China & Foreign Highway,2022,42(4):113-117.
[2]张榄,姚磊,杨祖涛.某长江大桥引桥连续箱梁长索体外预应力加固设计 [J].世界桥梁,2022,50(4):108-112.ZHANG Lan,YAO Lei,YANG Zutao.Design of strengthening continuous box girders of approach bridge of a Changjiang River Bridge with long external prestressing tendons [J].World Bridges,2022,50(4):108-112.
[3]曾永革,李传习,黄卓新.体外预应力 T梁桥设计若干问题探讨 [J].中外公路,2009,29(1):126-129.ZENG Yongge,LI Chuanxi,HUANG Zhuoxin.Discussion on some problems in design of externally prestressed T-beam bridge [J].Journal of China & Foreign Highway,2009,29(1):126-129.
[4]娄亮,潘竺兰,赵长军.预应力混凝土连续箱梁裂缝成因分析及加固措施 [J].公路,2011,56(8):49-52.LOU Liang,PAN Zhulan,ZHAO Changjun.Cause analysis and reinforcement measures of cracks in prestressed concrete continuous box girder [J].Highway,2011,56(8):49-52.
[5]李明洪,张锐.箱梁腹板加厚体内预应力加固技术实例分析及施工技术要点 [J].建筑结构,2018,48(4):96-99.LI Minghong,ZHANG Rui.Example analysis and construction technical points of internal prestress reinforcement of box-shaped girder with thickening webs[J].Building Structure,2018,48(4):96-99.
[6]张运清,赵庆云,孟涛.混凝土连续箱梁体外预应力加固技术研究 [J].中外公路,2020,40(3):164-167.ZHANG Yunqing,ZHAO Qingyun,MENG Tao.Study on external prestressed reinforcement technology of prestressed continuous box girder [J].Journal of China & Foreign Highway,2020,40(3):164-167.
[7]蒋伟,崔海.体外预应力加固桥梁的荷载试验评定研究[J].中外公路,2017,37(2):85-88.JIANG Wei,CUI Hai.Study on load test evaluation of bridges strengthened by external prestressing [J].Journal of China & Foreign Highway,2017,37(2):85-88.
[8]付星燃,胡承泽,高洪波.大跨径 T梁体外预应力加固锚固块设计研究 [J].世界桥梁,2021,49(1):101-106.FU Xingran,HU Chengze,GAO Hongbo.Research on anchoring external prestressing tendons with wedges in long-span T beam strengthening [J].World Bridges,2021,49(1):101-106.
[9]陈涛,江红涛,柯卫峰.某连续箱梁桥体外预应力门槛梁锚固块设计研究 [J].世界桥梁,2016,44(1):40-45.CHEN Tao,JIANG Hongtao,KE Weifeng.Study of design of sill-beam anchor blocks for external prestressing tendons of a continuous box beam bridge [J].World Bridges,2016,44(1):40-45.
[10]卢发亮.预应力混凝土箱梁体外索应力损失监测研究[J].中外公路,2021,41(2):115-119.LU Faliang.Research on stress loss monitoring of external cables in prestressed concrete box girders [J].Journal of China & Foreign Highway,2021,41(2):115-119.
[11]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.
[12]吕宏奎.某重载铁路连续刚构桥底板崩裂加固设计 [J].桥梁建设,2019,49(1):71-76.LYU Hongkui.Reinforcement design for bursting cracks in bottom slab of a heavy-duty railway continuous rigid frame bridge [J].Bridge Construction,2019,49(1):71-76.[13]褚文涛,关进轩,杨帆,等.轨道交通大跨度预应力混凝土连续梁桥加固设计 [J].世界桥梁,2023,51(增刊 1):159-166.CHU Wentao,GUAN Jinxuan,YANG Fan,et al.Retrofit design of long-span prestressed concrete continuous light rail bridge [J].World Bridges,2023,51(sup 1):159-166.
[14]吴海军,唐海淘,陈涛,等.预应力混凝土梁下挠开裂后顶升过程刚度模拟方法研究 [J].中外公路,2022,42(5):88-92.WU Haijun,TANG Haitao,CHEN Tao,et al.Study on simulation method of stiffness of prestressed concrete girder with down-warping flexural cracking during jacking process [J].Journal of China & Foreign Highway,2022,42(5):88-92.
[15]王磊,杨飞,董水英.基于阶梯刚度模式的 PC梁开裂后挠度分析方法 [J].公路交通科技,2018,35(10):63-68，81.WANG Lei,YANG Fei,DONG Shuiying.A method for analysing deflection of PC girder after cracking based on ladder stiffness mode [J].Journal of Highway and Transportation Research and Development,2018,35(10):63-68，81.
[16]余超良.体外预应力加固连续梁桥施工监控研究 [J].中外公路,2013,33(6):202-204.YU Chaoliang.Study on construction monitoring of continuous beam bridge strengthened by external prestress[J].Journal of China & Foreign Highway,2013,33(6):202-204.
[17]苗建宝,冯威,许冰.体外预应力加固混凝土梁延性分析与试验研究 [J].世界桥梁,2019,47(3):76-80.MIAO Jianbao,FENG Wei,XU Bing.Ductility analysis of concrete beams strengthened with external prestressing and experimental study [J].World Bridges,2019,47(3):76-80.
[18]李嘉,李有志,江建.增大截面结合预应力加固矩形梁模型对比试验研究 [J].中外公路,2021,41(6):134-136.LI Jia,LI Youzhi,JIANG Jian.Comparative experimental study on bridge reinforcement by enlarging section-prestress method [J].Journal of China & Foreign Highway,2021,41(6):134-136.
[19]肖金军,李传习.小半径曲线箱梁非对称增大截面加固分析与试验研究 [J].中外公路,2019,39(2):75-79.XIAO Jinjun,LI Chuanxi.Experimental study and analysis of reinforcement of small-radius curved box-girders strengthened by asymmetric increasing cross-section method [J].Journal of China & Foreign Highway,2019,39(2):75-79.
[20]王永宝,毛敏,刘志华,等.体外预应力加固预应力混凝土梁的静力试验 [J].建筑结构,2022,52(增刊 1):2107 -2113.WANG Yongbao,MAO Min,LIU Zhihua,et al.Static test of prestressed concrete beams strengthened by external prestressing [J].Building Structure,2022,52(sup 1):2107 -2113.

Download

Share

COinS