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Highway steel box girder bridge temperature gradient mode evaluation method
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A temperature gradient, model evaluation technology, applied in bridges, bridge maintenance, bridge reinforcement, etc.
Active Publication Date: 2017-11-24
CHANGAN UNIV
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Engineering design generally refers to the British bridge code BS-5400 to estimate the temperature effect of the structure. However, due to the different external environmental factors that affect the temperature distribution of the bridge structure such as sunshine, weather, and geographical environment, the BS-5400 temperature gradient curve may not be applicable to bridge structures in china
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Embodiment 1
[0128] 1. Arrange temperature measuring points on the web and roof of the unpaved steel box girder bridge and collect the temperature. The time interval for each collection is 3 minutes. The time interval for each collection can also be 2 minutes. The time interval for each collection can also be is 5 minutes;
[0129] Referring to the British standard BS-5400 on the temperature gradient of steel bridges, temperature measuring points are arranged on both sides of the web of the steel box girder without pavement, and the positions of the temperature measuring points are expressed as 0.0m, 0.05m, 0.1m, 0.2m, 0.3m, 0.45m, 0.6m, 0.9m and the bottom of the web, the roof measuring point is located at the transverse midpoint of the roof of the steel box girder bridge, and the temperature of each measuring point is collected and recorded every 3 minutes.
[0130] 2. Analyze the collected temperature of the steel box girder bridge without pavement, find out the temperature data at the ...
Embodiment 2
[0169] 1. Arrange temperature measuring points on the web and roof of the 5cm asphalt-paved steel box girder bridge and collect the temperature. The time interval for each collection is 3 minutes, and the time interval for each collection can also be 2 minutes. Can be 5 minutes;
[0170] Referring to the British standard BS-5400 on the temperature gradient of steel bridges, temperature measuring points are arranged on both sides of the web of the 5cm asphalt paved steel box girder, and the positions of the temperature measuring points are expressed as 0.0m, 0.05m, 0.1m, 0.2m, 0.3m, 0.45m, 0.6m, 0.9m and the bottom of the web, the roof measuring point is located at the transverse midpoint of the roof of the steel box girder bridge, and the temperature of each measuring point is collected and recorded every 3 minutes.
[0171] 2. Analyze the collected temperature of the 5cm asphalt paved steel box girder bridge, find out the temperature data at the time corresponding to the dail...
Embodiment 3
[0213] 1. Arrange temperature measuring points on the web and roof of the 10cm asphalt-paved steel box girder bridge and collect the temperature. The time interval for each collection is 3 minutes, and the time interval for each collection can also be 2 minutes. Can be 5 minutes;
[0214] Referring to the British standard BS-5400 on the temperature gradient of steel bridges, temperature measuring points are arranged on both sides of the web of the 10cm asphalt paved steel box girder. m, 0.2m, 0.3m, 0.45m, 0.6m, 0.9m and the bottom of the web, the roof measuring point is located at the transverse midpoint of the roof of the steel box girder bridge, and the temperature of each measuring point is collected and recorded every 3 minutes.
[0215] 2. Analyze the collected temperature of the 10cm asphalt-paved steel box girder bridge, find out the temperature data at the time corresponding to the daily extreme temperature difference of each measuring point on the web, take the temper...
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Abstract
The invention relates to a highway steel box girder bridge temperature gradient mode evaluation method. Temperature measuring points are arranged on webs and a top plate of a steel box girder bridge to collect temperature, the collected temperature of the steel box girder bridge is analyzed, temperature data of the moment corresponding to the daily extreme temperature difference value of each measuring point of the webs is found out, an obtained temperature gradient curve is simplified into a fold line, and temperature gradientmodes are formed; a daily extreme temperature difference value of each fold point of the web in the vertical temperature gradient mode and a daily extreme temperature difference value of each fold point of the top plate in the transverse temperature gradient mode are obtained; statistical analysis is conducted on the daily extreme temperature difference value of each fold point of the top plate and the webs of the steel box girder bridge, a temperature difference probability distribution histogram is obtained, and then probability fitting is carried out on the histogram so as to obtain a daily extreme temperature difference probability density function; finally, temperature difference standard values of the steel box girder before paving and after paving in different reproduction periods are calculated, and recommended values of the temperature difference standard values are obtained.
Description
technical field [0001] The invention belongs to the technical field of bridge temperature detection, and in particular relates to an evaluation method for a temperature gradient mode of a highway steel box girder bridge. Background technique [0002] As a kind of natural load, the temperature load is basically caused by the transmission of solar energy and the movement of the earth itself, as well as the local meteorological environment and geographical conditions. Compared with the service life of the structure, the changes of these factors can be ignored. Therefore, the temperature load is regarded as a stationary random process. [0003] The temperature effect on the bridge structure is divided into uniform temperature effect and gradient temperature effect. Gradient temperature effect can be divided into vertical temperature gradient effect and transverse temperature gradient effect. The temperature gradient acting on the bridge structure will cause temperature self-co...
Claims
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Application Information
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