Research on Improving Bearing Capacity of Full-Scale Prestressed Concrete Small Box Girders

Authors

• HUANG Jianyun, Ningxia Jiaotou Expressway Management Co ., Ltd., Yinchuan , Ningxia 750001 , ChinaFollow
• GAO Linli, CCCC First Highway Consultants Co ., Ltd., Xi’an, Shaanxi 710075 , China
• LIU Zufeng, CCCC First Highway Consultants Co ., Ltd., Xi’an, Shaanxi 710075 , China
• MA Jinku, Ningxia Jiaotou Expressway Management Co ., Ltd., Yinchuan , Ningxia 750001 , China
• MA Ming, CCCC First Highway Consultants Co ., Ltd., Xi’an, Shaanxi 710075 , ChinaFollow
• WANG Xiaoguang, CCCC First Highway Consultants Co ., Ltd., Xi’an, Shaanxi 710075 , China

Corresponding Author

马明，男，博士，副高级工程师.E-mail：379831642@qq.com

Abstract

To solve the problems of lacking comparative research on the improvement effects of different reinforcement methods when formulating reinforcement schemes for prestressed concrete small box girders and that existing bearing capacity improvement tests mostly focus on scale models with insufficient reliability of results, full-scale model tests and numerical simulation analysis of five 30 m span prestressed concrete small box girders with different joint reinforcement measures were conducted in this paper. Finite element models for two single reinforcement measures were established, and the improvement effects of different reinforcement methods on the bearing capacity of prestressed concrete small box girders were studied. The results indicate that compared with the unreinforced test girders, the damage ranges of all strengthened girders decrease, and their ultimate bearing capacities are improved to a certain extent. In terms of joint reinforcement measures, the joint reinforcement measure of pasting steel plates on webs, thickening bottom plates, and adding prestress has good effects in all aspects. The mid-span deflection decreases by about 42.7%; the structural stiffness increases by about 23%; the concrete stress decreases by about 28.6%; the cracking load increases by about 64.71%, and the ultimate bearing capacity increases by about 40%. Among the effects of single reinforcement measures, the measure of thickening the bottom plate (adding prestress) has good effects in reducing mid-span deflection, improving structural stiffness, reducing mid-span concrete stress, improving cracking load, inhibiting crack development, and improving ultimate bearing capacity. The test and simulation analysis results in this paper can provide a certain reference for the subsequent reinforcement reconstruction and bearing capacity improvement of similar bridges.

Publication Date

6-27-2026

DOI

10.14048/j.issn.1671-2579.2026.03.019

First Page

171

Last Page

183

Submission Date

June 2026

Recommended Citation

Jianyun, HUANG; Linli, GAO; Zufeng, LIU; Jinku, MA; Ming, MA; and Xiaoguang, WANG (2026) "Research on Improving Bearing Capacity of Full-Scale Prestressed Concrete Small Box Girders," Journal of China & Foreign Highway: Vol. 46: Iss. 3, Article 19.
DOI: 10.14048/j.issn.1671-2579.2026.03.019
Available at: https://zwgl1980.csust.edu.cn/journal/vol46/iss3/19

Reference

[1]李宽.高速公路小箱梁病害机理分析与加固处置策略研究[D].郑州:郑州大学,2021.LI Kuan.Study on disease mechanism analysis and reinforcement disposal strategy of small box girder in expressway [D].Zhengzhou:Zhengzhou University,2021.
[2]麦鑫浩.斜交小箱梁中横隔板优化布设研究 [J].中外公路，2023,43（3）：150-154.MAI Xinhao.Study on optimal layout of cross-diaphragm in oblique small box girder [J].Journal of China & Foreign Highway,2023，43(3):150-154.
[3]罗锟，王凯新，甄慧杰，等.高速列车作用下 40 m和32 m简支箱梁动力性能研究 [J].桥梁建设，2025，55（1）：49-55.LUO Kun,WANG Kaixin,ZHEN Huijie,et al.Study on dynamic performance of 40 m and 32 m long simply-supported box girders under action of high-speed train loads [J].Bridge Construction,2025,55(1):49-55.
[4]贺拴海,赵祥模,马建,等.公路桥梁检测及评价技术综述[J].中国公路学报,2017,30(11):63-80.HE Shuanhai,ZHAO Xiangmo,MA Jian,et al.Review of highway bridge inspection and condition assessment [J].China Journal of Highway and Transport,2017,30(11):63-80.
[5]谭志兵，姚仕伟，朱泽文，等.基于检测数据的预制箱梁桥性能退化随机模型研究 [J].世界桥梁，2025，53（4）：126-133.TAN Zhibing,YAO Shiwei,ZHU Zewen,et al.Research on stochastic modelling of performance degradation of precast box girder bridges based on detection data [J].World Bridges,2025,53(4):126-133.
[6]王春生,王世超,王茜,等.危旧预应力混凝土箱梁承载性能足尺试验 [J].工程力学,2019,36(8):171-181.WANG Chunsheng,WANG Shichao,WANG Qian|Xi ),et al.Experimental study on bearing capacity of dangerous and/or old pre-stressed concrete box girders [J].Engineering Mechanics,2019,36(8):171-181.
[7]贾卫中，蔡金标，王天羽，等.杭州湾跨海铁路大桥引桥80 m预制混凝土箱梁水化热分析及裂缝控制研究 [J].桥梁建设，2025，55（3）：1-10.JIA Weizhong,CAI Jinbiao,WANG Tianyu,et al.Hydration heat analysis and crack control for 80 m long precast concrete box girders in approach bridge of Hangzhou Bay Sea-Crossing Railway Bridge [J].Bridge Construction,2025,55(3):1-10.
[8]胡贵华.CFRP网格端锚加固混凝土箱梁抗弯承载能力分析 [J].中外公路，2025,45（4）：158-165.HU Guihua.Analysis of flexural bearing capacity of concrete box girders reinforced with CFRP mesh end anchors [J].Journal of China & Foreign Highway,2025，45(4):158-165.
[9]张瀚誉.在役预应力混凝土小箱梁承载能力提升研究[D].石家庄:石家庄铁道大学,2022.ZHANG Hanyu.Research on improving the bearing capacity of existing prestressed concrete box girder [D].Shijiazhuang:Shijiazhuang Tiedao University,2022.
[10]谭映梁，祝兵，崔圣爱.钢桁腹 ‒混凝土组合箱梁局部外接节点静载试验及极限承载力计算研究 [J].桥梁建设，2024，54（4）：69-76.TAN Yingliang,ZHU Bing,CUI Shengai.Static load tests and ultimate load bearing capacity calculation of local external joints of concrete box girders with steel truss webs [J].Bridge Construction,2024,54(4):69-76.[11]梁庆学，熊诚，危玉蓉，等.多跨连续梁桥整体顶升方案设计与施工 [J].世界桥梁，2025，53（4）：119-125.LIANG Qingxue,XIONG Cheng,WEI Yurong,et al.Design and implementation of integral jack-up of multi-span continuous girder bridge [J].World Bridges,2025,53(4):119-125.
[12]王尚.在役预应力混凝土小箱梁极限承载能力研究 [D].石家庄:石家庄铁道大学,2021.WANG Shang.Research on ultimate bearing capacity of existing prestressed concrete box girder [D].Shijiazhuang:Shijiazhuang Tiedao University,2021.
[13]吴旭东.基于荷载试验的预应力连续小箱梁桥加固前后受力性能研究 [D].重庆:重庆交通大学,2019.WU Xudong.Research on mechanical properties of prestressed concrete continuous girder bridge based on load test before and after reinforcement [D].Chongqing:Chongqing Jiaotong University,2019.
[14]宋重阳,付星燃,高洪波,等.预应力连续箱梁体内体外组合预应力加固技术研究 [J].中外公路，2025,45（2）：187-193.SONG Chongyang,FU Xingran,GAO Hongbo,et al.Internal and external prestress reinforcement technology for prestressed continuous box girder [J].Journal of China & Foreign Highway,2025，45(2):187-193.
[15]张浩男.钢筋混凝土桥梁损伤及加固技术研究与应用[D].郑州:华北水利水电大学,2023.ZHANG Haonan.Research and application of reinforced concrete bridge damage and reinforcement technology [D].Zhengzhou:North China University of Water Resources and Electric Power,2023.
[16]胡营，李淑明，骆佐龙，等.基于实际损伤的桥梁体外预应力加固锚固区应力分析与配筋设计 [J].世界桥梁，2024，52（1）：110-116.HU Ying,LI Shuming,LUO Zuolong,et al.Analysis of stresses in anchorage zone of external prestressing tendons implemented to retrofit damaged bridge and prestressing tendons design [J].World Bridges,2024,52(1):110-116.
[17]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.
[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]王婧.粘钢加固预应力混凝土箱梁力学性能研究 [D].石家庄:石家庄铁道大学,2018.WANG Jing.Study on mechanical behavior of prestressed concrete box-girder bonded with steel plate [D].Shijiazhuang:Shijiazhuang Tiedao University,2018.
[20]王渠,吴庆雄,黄宛昆,等.预应力碳纤维板加固空心板桥试验研究 [J].南昌大学学报 (工科版 ),2019,41(3):247-252.WANG Qu,WU Qingxiong,HUANG Wankun,et al.Experimental research on hollow slab bridge reinforced by prestressed CFRP plate [J].Journal of Nanchang University (Engineering & Technology ),2019,41(3):247-252.
[21]李松辉,赵国藩,王松根.粘贴碳纤维布加固钢筋混凝土预裂梁试验研究 [J].土木工程学报,2005,38(10):88-92，107.LI Songhui,ZHAO Guofan,WANG Songgen.Experimental study on pre-cracked RC beams strengthened with cfrp [J].China Civil Engineering Journal,2005,38(10):88-92，107.
[22]QI J N,MA Z J,WANG J Q,et al.Post-cracking shear behaviour of concrete beams strengthened with externally prestressed tendons [J].Structures,2020,23:214-224.
[23]KIM S H,PARK J S,JUNG W T,et al.Experimental study on strengthening effect analysis of a deteriorated bridge using external prestressing method [J].Applied Sciences,2021,11(6):2478.
[24]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.
[25]原国华.某预应力混凝土小箱梁桥不同加固方法试验对比分析 [J].山西交通科技,2015 (4):51-53.YUAN Guohua.The test comparative analysis of different reinforcement methods f or a prestressed concrete small box beam bridge [J].Shanxi Science & Technology of Communications,2015 (4):51-53.
[26]王世超,王春生,段兰,等.组合加固足尺预应力混凝土箱梁抗弯性能试验 [J].交通运输工程学报,2018,18(5):56-65.WANG Shichao,WANG Chunsheng,DUAN Lan,et al.Flexural behavior experiment of full-scale PC box girder strengthened by composite technique [J].Journal of Traffic and Transportation Engineering,2018,18(5):56-65.
[27]虞子楠,贺拴海,任乐平,等.预应力混凝土箱梁损伤后剩余承载力计算及变化规律研究 [J].中国公路学报,2021,34(9):242-252.YU Zinan,HE Shuanhai,REN Leping,et al.Research on residual bearing capacity calculation method and changing law of damaged prestressed concrete box girder[J].China Journal of Highway and Transport,2021,34(9):242-252.
[28]ZHANG J R,LI C X,XU F H,et al.Test and analysis for ultimate load-carrying capacity of existing reinforced concrete arch ribs [J].Journal of Bridge Engineering,2007,12(1):4-12.
[29]BAGGE N,POPESCU C,ELFGREN L.Failure tests on concrete bridges:Have we learnt the lessons ?[J].Structure and Infrastructure Engineering,2018,14(3):292-319.
[30]曾宇,胡良明.ABAQUS 混凝土塑性损伤本构模型参数计 算 转 换 及 校 验 [J].水 电 能 源 科 学,2019,37(6):106-109.ZENG Yu,HU Liangming.Calculation transformation and calibration of ABAQUS concrete plastic damage constitutive model [J].Water Resources and Power,2019,37(6):106-109.