|Table of Contents|

Study on Temperature Effect of Composite Girder Cable-stayed Bridge During Construction in Alpine Region(PDF)

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

Issue:
2021年05期
Page:
107-117
Research Field:
Publishing date:

Info

Title:
Study on Temperature Effect of Composite Girder Cable-stayed Bridge During Construction in Alpine Region
Author(s):
HAN Shi1; 2;  LIU Yong-jian2;  WANG Zhen-hua3;  BAI Yong-xin2;  LIU Jiang2;  WANG Zhi-xiang4
(1. Qinghai Transportation Engineering Technical Service Center, Xining 810003, Qinghai, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 3. Ordos Transportation Engineering Quality Monitoring and Appraisal Service Center, Ordos 017000, Inner Mongolia, China; 4. Anhui Transport Consulting and Design Institute Co., Ltd, Hefei 610213, Anhui, China)
Keywords:
cable-stayed bridge;  composite girder;  construction stage;  heat conduction analysis;  temperature effect;  alpine region
PACS:
TU375
DOI:
10.19815/j.jace.2021.04004
Abstract:
Taking the Haihuang Bridge with a main span of 560 m in Qinghai as the supporting project, based on the meteorological data analysis of the weather station near the bridge in recent 5 years, the temperature fields of steel girder, concrete deck, stay cable and tower of Haihuang Bridge were simulated by using the heat conduction principle, and the temperature action of different components were extracted and analyzed. Based on this, the temperature effect of composite girder cable-stayed bridge under two key construction stages, the maximum double cantilever and the maximum single cantilever, was calculated by using the frame model. Combined with the control range of construction error, the reasonable time for construction control of each component was given. The results show that under the action of solar radiation in different seasons, the variation laws of effective temperature and equivalent vertical linear temperature difference of steel girder, bridge deck, stay cable and bridge tower are similar, but the values are quite different as the highest value in summer and the lowest value in winter. The maximum temperature difference between concrete bridge deck and stay cable is 10.8 ℃ within the scope specified in the design code of cable-stayed bridge. The maximum temperature difference between stay cable and main tower is 10.2 ℃, which is greater than the temperature difference recommended by the specification. The equivalent vertical linear temperature difference of composite girder can reach 14.9 ℃, which exceeds the value of specification. Under the action of temperature, the daily variation of main girder displacement can reach 87 mm, and the elevation control of main girder should be carried out from 19:00 to 6:00. The tower top deviation can reach 54 mm, and the monitoring of the tower top deviation should be selected from 2:00 to 10:00 in the morning. The variation value of cable force reaches 4.4% of the construction control cable force, which should be avoided from 8:00 to 20:00 in the construction control. In the construction control process of the Haihuang Bridge, the influence of temperature was fully considered, and well construction control effect is achieved.

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Last Update: 2021-09-01