|Table of Contents|

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

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年03期
Page:
135-146
Research Field:
桥隧工程
Publishing date:

Info

Title:
Analysis of shrinkage and creep effect of high-speed railway cable-stayed bridge with stiffened steel truss in operation stage
Author(s):
ZHAO Fei1;  ZHANG Wentao2;  CUI Runhao2; 3;  LIU Yongjian2; 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)
Keywords:
high-speed railway;  cable-stayed bridge;  beam-truss composite structure;  shrinkage;  creep;  finite element analysis
PACS:
U448.27
DOI:
10.19815/j.jace.2023.09107
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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Last Update: 2025-06-01