|Table of Contents|

Lateral temperature distribution of concrete single-box double-chamber model in Tibet Plateau(PDF)

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

Issue:
2023年3期
Page:
45-44
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Lateral temperature distribution of concrete single-box double-chamber model in Tibet Plateau
Author(s):
XU Xiang-feng1;  MA Lu-ai1;  ZHANG Feng2;  WANG Da-wei2
(1. School of Transportation and Civil Engineering, Shandong Jiaotong University, Jinan 250357, Shandong, China; 2. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China)
Keywords:
bridge engineering;  lateral temperature distribution;  model test;  single box and double chamber;  Tibet Plateau
PACS:
U441.5
DOI:
10.19721/j.cnki.1671-8879.2023.03.005
Abstract:
In order to study the transverse temperature distribution law of single box and double chamber concrete box girder in plateau area, a test model of concrete box girder was established in Shannan, Xizang, and 180 structural temperature sensors as well as solar radiation, atmospheric temperature and wind speed sensors were installed. Field observation was carried out for a year, based on the measured data, the transverse temperature distribution law of concrete box girder was studied. Using the extreme value theory, the transverse temperature difference of Shannan area with return period of 50 years was calculated. A transverse temperature gradient exponential distribution model considering the dorsolateral side was proposed, and its validity was verified based on the field measurement law. Based on the representative values of meteorological parameters and the verified prediction formula, the value of transverse temperature difference between roof and floor was obtained once in 50 years, and it was compared with the code for design of concrete structures of railway bridges and culverts(TB 10092—2017). The results show that there is a non-ignored transverse temperature difference between the top plate and the bottom plate. The transverse temperature difference from October to February(the next year)is higher than that from June to August. The maximum transverse temperature difference appears in February winter, and the maximum temperature difference between the top plate and the bottom plate is 23.14 ℃ and 16.96 ℃, respectively. By replacing the environmental factors of maximum daily temperature difference, total daily radiation amount and average daily wind speed in previous studies with the meteorological parameters of solar radiation, atmospheric temperature and wind speed at any time, the empirical relationship between transverse temperature difference and atmospheric temperature Ta, solar radiation Ia and wind speed wa at any time is presented as one-time, one-time and quadratic. The accuracy of the formula is verified by fitting the measured temperature difference with the predicted temperature difference. The formula can accurately calculate the transverse temperature difference between the roof and the bottom plate before asphalt is laid on the concrete box girder. The value of transverse temperature difference given by the code was lower than the value of transverse temperature difference in 50 years of return period, and the roof was 9.4 ℃ higher than the standard. Therefore, it is necessary to combine the local climate characteristics for a reasonable value.1 tab, 17 figs, 29 refs.

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Last Update: 2023-06-30