|Table of Contents|

Bending-bearing capacity of UHPC-NC composite negative bending moment region of small box girder(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2024年6期
Page:
59-71
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Bending-bearing capacity of UHPC-NC composite negative bending moment region of small box girder
Author(s):
CAO Hong-you1;  CHEN Yun-feng1;  LI Jun2;  YANG Dong-yang3;  LI Tao1
(1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430079, Hubei, China; 2. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China; 3. Design Company, China Railway Major Bridge Engineering Group Co., Ltd., Wuhan 430050, Hubei, China)
Keywords:
bridge engineering;  simply supported and then continuous structure;  small box girder;  negative bending moment;  finite element analysis;  parameter analysis
PACS:
U448.213
DOI:
10.19721/j.cnki.1671-8879.2024.06.006
Abstract:
The construction process of negative bending moment tendons of simply supported and then continuous small box girder beam bridge was complex and inefficient, and improper construction can lead to issues such as cracking of the bridge deck.However, the ultra-high performance concrete-normal concrete(UHPC-NC)composite negative bending moment region can effectively address these problems. A 3×30 m span small box girder beam bridge was taken as an example, a refined finite element model of the UHPC-NC composite negative bending moment region was established based on the concrete damage plasticity(CDP)constitutive model, and a 1:2 scaled model test was conducted. Three key parameters influencing the stress performance of the UHPC-NC compositenegative bending moment region were identified, UHPC thickness, UHPC layer steel bar diameter, and UHPC tensile strength. The variation in the cracking load and bending-bearing capacity of the negative bending moment region under different combinations of these parameters was studied. The results show that the cracking moment of the test specimen is3 620 kN?m, the bending-bearing capacity is 9 611 kN?m, while the design value of negative moment for the background bridge example under normal serviceability limit state is 3 300 kN?m, and the design value of negative moment for the ultimate limit state is 5 838 kN?m.The crack resistance and bending-bearing capacity of the UHPC-NC composite negative bending moment region are both in accordance with the engineering requirements, and the experimental results are well consistent with the calculation results of the solid finite element model.For every 25 mm increase in UHPC thickness, the cracking load of the beam increases by approximately 10% and the bending-bearing capacity increases by approximately 9%. The change in UHPC thickness has a significant impact on both the cracking moment and bending-bearing capacity of the UHPC-NC composite beam. For every 2 mm increase in UHPC layer steel bar diameter, the bending-bearing capacity of the beam increases by approximately 6%, while the cracking load only increases by about 1.8%. The different diameters of UHPC layer steel bars primarily affect the residual stiffness and bending-bearing capacity of the beam after cracking, with a minor effect on the cracking load. On the other hand,for every 2 MPa increase in UHPC tensile strength, the bending-bearing capacity of the beam increases by approximately 10%, but the impact on the cracking load is limited. Increasing the UHPC tensile strength leads to an increase in the residual stress of the UHPC layer upon failure, contributing to the bending-bearing capacity of the UHPC-NC composite beam and thus enhancing the bending-bearing capacity of the beam. For a 30 m span small box girder beam bridge, it is recommended that a UHPC length of 2 m be provided on each side of the mid-support, with a UHPC thickness of 200 mm and a UHPC layer steel bar diameter of 10 mm.5 tabs, 24 figs, 29 refs.

References:

[1] 田 飞,夏 昊,王 敏,等.中小跨径全装配式梁桥一体化架设方法及装备[J].中外公路,2022,42(5):83-87.
TIAN Fei,XIA Hao,WANG Min,et al.Integrated erection methodand equipment of full prefabrication medium and small spanbridges[J].Journal of China and Foreign Highways,2022,42(5):83-87.
[2]HUANG J J,SU Q,ZHANG L C,et al.Rapid treatment techniqueof diseases of the rocking axle bearing of railway simplysupported beam bridge[J].Applied Mechanics andMaterials,2013,351-352:1440-1444.
[3]向木生,贺 媚.简支转连续结构临时支座横向拆除顺序研究[J].交通科技,2017(6):61-64.
XIANG Mu-sheng,HE Mei.Study on the horizontal removalorder of temporary bearing in simply supported-continuousstructure[J].Transportation Science and Technology,2017(6):61-64.
[4]MILLER R A,CASTRODALE R,MIRMIRAN A,et al.Connection ofsimple-span precast concrete girders forcontinuity[J].NCHRP Report,2004(519):203.
[5]GASTAL F,ZIA P.Analysis of bridge beams with jointlessdecks[J].Durability of Structures,1989(57):555-560.
[6]庄一舟,徐 亮,程俊峰,等.简支梁桥桥面连续结构力学特性理论分析[J].中国公路学报,2017,30(7):73-85.
ZHUANG Yi-zhou,XU Liang,CHENG Jun-feng,et al.Theoreticalanalysis of mechanical properties for continuous deckstructure of simply supported beam bridge[J].China Journalof Highway and Transport,2017,30(7):73-85.
[7]张子轩.超宽桥梁UHPC-NC组合桥面板力学性能分析[D].武汉:华中科技大学,2020.
ZHANG Zi-xuan.A thesis submitted in partial fulfillment of therequirements for the degree of master of engineering[D].Wuhan:Huazhong University of Science and Technology,2020.
[8]盛兴旺,周相华.先简支后连续梁桥结构的疲劳性能与抗裂性能[J].中南大学学报(自然科学版),2005,31(3):511-516.
SHENG Xing-wang,ZHOU Xiang-hua.Fatigue behaviour andanticrack property of simply supported-to-continuous beam[J].Journal of Central South University(Natural Science),2005,31(3):511-516.
[9]周建庭,谭书林,谭 华,等.预应力混凝土T梁简支变连续负弯矩区段改进构造试验研究[J].中外公路,2018,38(4):89-95.
ZHOU Jian-ting,TAN Shu-lin,TAN Hua,et al.Research onstructural improvement test in negative moment section withthe change from simple supporting to continuous of theprestressed concrete T-beam[J].Journal of China and ForeignHighways,2018,38(4):89-95.
[10]陈 强.先简支后连续结构体系后连续端部施工顺序研究[J].铁道标准设计,2004(8):65-68.
CHEN Qiang.Study on construction sequence of continuousend of simply supported to continuous structural system[J].Railway Standard Design,2004(8):65-68.
[11]GRAYBEAL B,BRUHWILER E,KIM B S,et al.Internationalperspective on UHPC in bridge engineering[J].Journal ofBridge Engineering,2020,25(11):04020094.
[12]邵旭东,樊 伟,黄政宇.超高性能混凝土在结构中的应用[J].土木工程学报,2021,54(1):1-13.
SHAO Xu-dong,FAN Wei,HUANG Zheng-yu.Application ofultra-high-performance concrete in engineering structures[J].China Civil Engineering Journal,2021,54(1):1-13.
[13]DU J,MENG W,KHAYAT K H,et al.New development ofultra-high-performance concrete(UHPC)[J].Composites Part B:Engineering,2021,224:109220.
[14]吴新印,胡方健,刘兆丰.预制装配式超高性能混凝土(UHPC)桥梁盖梁施工工艺研究[J].中外公路,2022,42(2):138-141.
WU xin-yin,HU Fang-jian,LIU Zhao-feng.Construction technology research on prefabricated bridge bent cap made with ultra high performance concrete(UHPC)[J].Journal of China & Foreign Highway,2022,42(2):138-141.
[15]HUNG C C,EL-TAWIL S,CHAO S H.A review of developmentsand challenges for UHPC in structural engineering:Behavior,analysis,and design[J].Journal of StructuralEngineering,2021,147(9):03121001.
[16]袁 晟,颜东煌,袁 明,等.养护方式和早龄期对钢纤维-UHPC基体界面黏结性能的影响[J].长安大学学报(自然科学版),2022,42(6):133-142.
YUAN Sheng,YAN Dong-huang,YUAN Ming,et al.Effect of curing method and early age on interfacialbond properties of steel fiber-UHPC matrix[J].Journal of Chang'an University(Natural Science Edition),2022,42(6):133-142.
[17]LI W,JI W,AN M,et al.Flexural performance of compositeprestressed UHPC-NCT-girders[J].Journal of BridgeEngineering,2020,25(9):04020064.
[18]YAN B,QIU M,ZENG T,et al.Full-scale experimentalverification of UHPC-RC composite slab culvert with a clearspan of 8 m[J].Journal of BridgeEngineering,2020,25(12):05020010.
[19]JIANG H,DONG X,FANG Z,et al.Experimental study on shearbehavior of a UHPC connection between adjacent precastprestressed concrete voided beams[J].Journal of BridgeEngineering,2020,25(12):04020106.
[20]陈宝春,黄卿维,苏家战,等.中国第一座超高性能混凝土(UHPC)公路箱梁桥的设计与施工[J].中外公路,2021,41(5):74-77.
CHEN Bao-chun,HUANG Qing-wei,SU Jia-zhan.Design and construction of the first UHPC highway box-girder bridge in China[J].Journal of China & Foreign Highway,2021,41(5):74-77.
[21]刘 超,吉 赫.超高性能混凝土-混凝土组合梁抗剪承载力计算方法[J].同济大学学报(自然科学版),2019,47(8):1123-1130.
LIU Chao,JI He.Shear resistance of ultra-high performanceconcrete-concrete composite beam[J].Journal of TongjiUniversity(Natural Science),2019,47(8):1123-1130.
[22]邵旭东,孔小璇,邱明红,等.先简支后连续混凝土梁负弯矩区UHPC“T形”湿接缝试验研究[J].湖南大学学报(自然科学版),2021,48(3):1-13.
SHAO Xu-dong,KONG Xiao-xuan,QIU Ming-hong,et al.Experimental study on UHPC “T-shaped” wet joints in thenegative moment zone of continuous concrete beams aftersimple support[J].Journal of Hunan University(NaturalSciences),2021,48(3):1-13.
[23]刘新华,周 聪,张建仁,等.钢-UHPC组合梁负弯矩区受力性能试验[J].中国公路学报,2020,33(5):110-121.
LIU Xin-hua,ZHOU Cong,ZHANG Jian-ren,et al.Experiment onnegative bending behavior of steel-UHPC compositebeams[J].China Journal of Highway and Transport,2020,33(5):110-121.
[24]李 俊.简支变结构连续小箱梁桥负弯矩区UHPC-NC组合桥面板抗裂性研究[J].铁道标准设计,2023(27):1-9.
LI Jun.Study on a new UHPC-NC composite bridge deck innegative moment region of a continuous bridge convertingfrom simple-support bridge with small box-girder section[J].Railway Standard Design,2023(27):1-9.
[25]李清富,匡一航,郭 威.CDP模型参数计算及取值方法验证[J].郑州大学学报(工学版),2021,42(2):43-48.
LI Qing-fu,KUANG Yi-hang,GUO Wei.CDP modelparameters calculation and value method verification[J].Journal of Zhengzhou University(EngineeringScience),2021,42(2):43-48.
[26]张 哲,邵旭东,李文光,等.超高性能混凝土轴拉性能试验[J].中国公路学报,2015,28(8):50-58.
ZHANG Zhe,SHAO Xu-dong,LI Wen-guang,et al.Axial tensilebehavior test of ultra high performance concrete[J].ChinaJournal of Highway and Transport,2015,28(8):50-58.
[27]AFNOR NF P18-710.National supplement toEurocode 2-Design of concrete structures:Specific rules forultra-high performance fiber-reinforced concretes(UHPFRC)[S].
[28]李学斌,董 亮,曾 兵,等.预制混凝土节段胶拼梁抗拉强度试验研究[J].中国铁道科学,2023,44(4):111-120.
LI Xue-bin,DONG Liang,ZENG Bing,et al.Experimental studyon tensile strength of precast concrete segmental adhesivespliced beams[J].China Railway Science,2023,44(4):111-120.
[29]邵旭东,虢玉标,邱明红.新型UHPC箱梁桥面体系横向受力性能[J].中国公路学报,2018,31(12):144-153.
SHAO Xu-dong,GUO Yu-biao,QIU Ming-hong.Lateral loadperformance of new UHPC box girder bridge deck system[J].China Journal of Highway and Transport,2018,31(12):144-153.

Memo

Memo:
-
Last Update: 2024-12-30