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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03期

页码:

135-146

栏目:

桥隧工程

出版日期:

2025-05-30

文章信息/Info

Title:

Analysis of shrinkage and creep effect of high-speed railway cable-stayed bridge with stiffened steel truss in operation stage

文章编号:

1673-2049(2025)03-0135-12

作者:

赵 飞¹,张文涛²,崔润豪^2,3,刘永健^2,3,卢 皓¹,程 高²

(1. 中铁第一勘察设计院集团有限公司,陕西 西安 710043; 2. 长安大学 公路学院,陕西 西安 710064; 3. 重庆大学 土木工程学院,重庆 400045)

Author(s):

ZHAO Fei¹, ZHANG Wentao², CUI Runhao^2,3, LIU Yongjian^2,3, LU Hao¹, CHENG Gao²

(1. China Railway First Survey and Design Institute Group Co., Ltd., Xi'an 710043, Shaanxi, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 3. School of Civil Engineering, Chongqing University, Chongqing 400045, China)

关键词:

高速铁路;  斜拉桥;  梁桁组合结构;  收缩;  徐变;  有限元分析

Keywords:

high-speed railway;  cable-stayed bridge;  beam-truss composite structure;  shrinkage;  creep;  finite element analysis

分类号:

U448.27

DOI:

10.19815/j.jace.2023.09107

文献标志码:

A

摘要:

混凝土的收缩徐变会直接影响梁桁组合结构高铁斜拉桥桥面与无砟轨道线形,进而影响高铁列车在桥面上的行车稳定性和舒适性。以在建的西安至十堰高铁汉江特大桥工程为研究对象,通过有限单元法研究梁桁组合结构高铁斜拉桥在运营阶段的收缩徐变效应。以成桥阶段的结构为基准,系统分析了运营1～30年期间收缩和徐变引起的主要构件变形和受力变化规律; 分别讨论了收缩和徐变的作用效应,分析两者对结构变形和受力的影响以及两者在结构变形中所占的比例,进一步研究了钢桁对收缩徐变引起的结构变形的影响。结果表明:收缩徐变会引起主梁跨中下挠,使桥塔向主梁跨中方向偏移,同时引起主梁和桥塔的压缩变形,且随着运营时间的增加,收缩徐变引起的结构变形在总变形中的比例也随之增加; 收缩徐变会使主梁截面上下缘应力和斜拉索索力发生变化,随着运营时间增加,斜拉索索力和主梁跨中区域上下缘压应力储备均降低; 钢桁对主梁跨中竖向变形影响较大,钢桁可减小收缩徐变引起的主梁变形; 收缩徐变对结构内力和变形的影响呈现出运营前期大、后期小和运营前期快、后期慢的趋势。

Abstract:

The shrinkage and creep of concrete directly affect the alignment of the bridge deck and ballastless track in truss-girder composite high-speed railway cable-stayed bridges, thereby influencing the riding stability and comfort of high-speed trains. Taking the under-construction Hanjiang extra large bridge on the Xi'an-Shiyan high-speed railway as the research object, the shrinkage and creep effects of truss-girder composite high-speed railway cable-stayed bridges during the operational stage was investigated by using the finite element method. Based on the as-built structural state, the deformation and stress variation laws of main components caused by shrinkage and creep over 1 to 30 years of operation were systematically analyzed. The individual effects of shrinkage and creep were discussed, including their impacts on structural deformation and stress and their proportional contributions to structural deformation. The influence of the steel truss on deformation induced by shrinkage and creep was further explored. The results show that shrinkage and creep cause mid-span deflection of the main girder, make the bridge tower shift to the mid-span direction of the main girder, and cause the compression deformation of the main girder and the bridge tower. As operational time increases, the proportion of structural deformation caused by shrinkage and creep in the total deformation rises. These effects also alter the stresses on the upper/lower surfaces of the main girder section and the cable forces. With operational time increases, both the cable forces and the compressive stress reserve on the upper and lower surfaces of the main girder's mid-span region decrease. The steel truss significantly mitigates the vertical deformation of the main girder mid-span caused by shrinkage and creep. The impacts of shrinkage and creep on structural stress and deformation exhibit a trend of being more pronounced and developing faster in the early operational stage, then diminishing in both magnitude and rate in the later stage.

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　LIANG Peng,XU Yue,LIU Yong-jian.Unified Analysis Theory of Cable Stay and Its Applications[J].Journal of Architecture and Civil Engineering,2006,23(03):68.
[3]邰扣霞,丁大钧.中国桥梁建设新飞跃[J].建筑科学与工程学报,2006,23(02):30.
　TAI Kou-xia,DING Da-jun.New Leaps in Construction of Bridges in China[J].Journal of Architecture and Civil Engineering,2006,23(03):30.
[4]吕志涛.高速铁路桥梁建设中的结构问题[J].建筑科学与工程学报,2006,23(03):1.
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　ZHANG Sha-sha,LIU Ya-chao,YANG Xiao-hua,et al.Experimental Study on Deformation Characteristics of Existing High-speed Railway Subgrade in Coarse Saline Soil Area[J].Journal of Architecture and Civil Engineering,2022,39(03):135.[doi:10.19815/j.jace.2021.04026]
[6]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.[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(03):139.[doi:10.19815/j.jace.2022.09113]

备注/Memo

备注/Memo:

收稿日期:2023-09-05
基金项目:陕西省秦创原“科学家+工程师”队伍建设项目(2022KXJ-036); 中国铁建股份有限公司科技研发项目(2021-C50); 中铁第一勘察设计院集团有限公司科研开发项目(2021KY59YB-13); 陕西省重点研发计划项目(2023-YBGY-167)
作者简介:赵 飞(1981-),男,高级工程师,E-mail:21220100@qq.com。
通信作者:程 高(1988-),男,工学博士,高级工程师,E-mail:chengg@chd.edu.cn。
Author resumes: ZHAO Fei(1981-), male, senior engineer, E-mail: 21220100@qq.com; CHENG Gao(1988-), male, PhD, senior engineer, E-mail: chengg@chd.edu.cn.

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更新日期/Last Update: 2025-06-01