|本期目录/Table of Contents|

[1]袁 明,杨诒飞,刘 昀,等.疲劳损伤下PPC斜拉桥主梁灌浆加固试验研究[J].建筑科学与工程学报,2025,42(01):139-147.[doi:10.19815/j.jace.2022.09113]
　YUAN Ming,YANG Yifei,LIU Yun,et al.Experimental study on grouting reinforcement of PPC cable-stayed bridge main girder under fatigue damage[J].Journal of Architecture and Civil Engineering,2025,42(01):139-147.[doi:10.19815/j.jace.2022.09113]
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疲劳损伤下PPC斜拉桥主梁灌浆加固试验研究(PDF)
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
42卷
期数:
2025年01期
页码:
139-147
栏目:
桥隧结构
出版日期:
2025-01-20

文章信息/Info

Title:
Experimental study on grouting reinforcement of PPC cable-stayed bridge main girder under fatigue damage
文章编号:
1673-2049(2025)01-0139-09
作者:
袁 明1,杨诒飞1,刘 昀2,颜东煌1,彭坤帅1,袁 晟1
(1. 长沙理工大学 土木工程学院,湖南 长沙 410114; 2. 湖南交通职业技术学院 路桥工程学院,湖南 长沙 410132)
Author(s):
YUAN Ming1, YANG Yifei1, LIU Yun2, YAN Donghuang1, PENG Kunshuai1, YUAN Sheng1
(1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China; 2. School of Road and Bridge Engineering, Hunan Communication Polytechnic, Changsha 410132, Hunan, China)
关键词:
桥梁工程;  刚度;  裂缝灌浆;  斜拉桥;  部分预应力;  黏结强度
Keywords:
bridge engineering;  stiffness;  crack grouting;  cable-stayed bridge;  partial prestress;  bond strength
分类号:
U448.27
DOI:
10.19815/j.jace.2022.09113
文献标志码:
A
摘要:
为研究部分预应力混凝土(PPC)斜拉桥疲劳损伤主梁采用灌浆加固后的刚度恢复效果和裂缝发展情况,以某座双塔斜拉桥为研究背景,选取跨中6个梁段,制作相似比为7.42的PPC斜拉桥节段缩尺模型,在经历了主梁具有不同初始损伤状态下的4轮疲劳试验后,对主梁开展了0.1、0.2、0.3、0.5 mm最大裂缝宽度的静载试验(对应工况1～4)。然后将主梁卸载至恒载状态,使用亲水性低黏度环氧结构胶对残余裂缝宽度W≥0.05 mm的裂缝进行带压灌浆修复,对灌浆后主梁开展相同裂缝宽度的静载试验,对比分析灌浆前后PPC斜拉桥主梁在各工况下的挠度、索力、刚度和裂缝发展情况,并与完好主梁的初始刚度进行对比。结果表明:环氧结构胶和主梁黏结作用良好,极大地减缓了裂纹扩展的速度; 在整个试验过程中,索力基本呈线性变化,斜拉索一直处于弹性阶段,使结构整体承载力有较大富余; 在PPC主梁经历了0.5 mm级裂缝大损伤情况下,环氧结构胶提高了裂缝处的界面黏结强度,使灌浆后主梁刚度恢复较好,在工况1～4中均不低于灌浆前主梁的刚度,但不能恢复到完好主梁的刚度。
Abstract:
In order to study the stiffness recovery effect and crack development of the main girder of partially prestressed concrete(PPC)cable-stayed bridge with fatigue damage after grouting reinforcement, a double-tower cable-stayed bridge was taken as the research background. Six beam sections in the middle span were selected to make a reduced scale model of PPC cable-stayed bridge with a similarity ratio of 7.42. After four rounds of fatigue tests under different initial damage states of the main girder, static load tests of 0.1, 0.2, 0.3, 0.5 mm maximum crack width on the main beam before grouting(corresponding to working conditions 1-4)were carried out, and then the main beam was unloaded to the dead load state. The cracks with residual crack width W≥0.05 mm were repaired with hydrophilic low viscosity epoxy structural adhesive under pressure, and the static load tests of the same crack width on the main beam after grouting were carried out. The deflection, cable force, stiffness and crack development of the main girder of PPC cable-stayed bridge under various working conditions before and after grouting were compared and analysed, and compared with the initial stiffness of the intact main girder. The results show that the epoxy structural adhesive and the main beam has a good synergistic effect, which greatly slows down the speed of crack propagation. During the whole test, the cable force basically changes linearly, and the stay cable is always in the elastic stage, which ensures that the bearing capacity of the main beam had greater surplus. Under the condition that the main beam experiences 0.5 mm level crack damage load, the epoxy structural adhesive improves the interface bonding strength at the crack, so that the stiffness of the main beam after grouting recovers well. In working conditions 1-4, the stiffness of the main girder is not lower than that of the main girder before grouting, but it cannot recover to the stiffness of the intact main girder.

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备注/Memo

备注/Memo:
收稿日期:2023-09-07 投稿网址:http://jace.chd.edu.cn
基金项目:国家自然科学基金项目(52078054,51878073); 湖南省交通科技项目(201932); 湖南省自然科学基金项目(2021jj30730); 湖南省研究生科研创新项目(CX20200832,CX20190650)
作者简介:袁 明(1980-),男,工学博士,副教授,E-mail:mingyuan@csust.edu.cn。
通信作者:刘 昀(1977-),女,工学博士,副教授,E-mail:45146556@qq.com。Author resumes: YUAN Ming(1980-), male, PhD, associate professor, E-mail: mingyuan@csust.edu.cn; LIU Yun(1977-), female, PhD, associate professor, E-mail: 45146556@qq.com.
更新日期/Last Update: 2025-01-20