Method for determining large-span bridge wind and temperature load combined design value

Abstract

The invention discloses a method for determining a large-span bridge wind and temperature load combined design value. The method comprises the following steps: collecting an extreme value sample groupof wind speed and temperature of more than 30 years of a meteorological observation station near a bridge; dividing each extreme value sample group of the wind speed and the air temperature into twosub-sample groups according to hot seasons and cold seasons; establishing a two-dimensional joint distribution model of the wind speed and the air temperature in each sub-sample group; calculating a two-variable recurrence period of the wind speed and the air temperature according to the joint distribution of each sub-sample group; drawing a two-variable recurrence period contour line of each sub-sample group; firstly setting a value of one variable according to a load standard, and combining the corresponding wind speed and temperature to form a group of basic wind speed and temperature combined design values; and converting the basic wind speed into a designed wind speed at a bridge calculation reference height, and converting the temperature into a structural temperature. According to the method, the aim of properly reducing the wind load and the temperature load which should be considered in the long-span bridge engineering design specified in the specification is achieved, and thelong-span bridge design is prevented from being too conservative.

Description

technical field [0001] The invention belongs to the field of bridge wind resistance design and research, in particular to a method for determining the joint design value of wind and temperature loads of long-span bridges. Background technique [0002] Long-span bridges are mostly distributed on some very important roads or railway transportation routes, and are lifeline projects that affect the national economy and people's livelihood. During the construction and operation of long-span bridges, various disastrous weather and extreme meteorological events may affect the safety of long-span bridges, bring certain risks to the safe operation of long-span bridges, and then affect the country's economic construction and people. safety of life and property. Therefore, in the design and research stage of long-span bridges, the influence of wind load and temperature load on the structure of long-span bridges should be carefully considered. [0003] "General Specifications for Desi...

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Problems solved by technology

[0005] Purpose of the invention: In view of the defect in the prior art that the wind load and temperature load that should be considered in the design of long-span bridges stipulated in the code cannot be properly reduced, the present invention provides a method for determining the joint design value of wind and temperature loads for long-span bridges , to achieve the goal of properly reducing the wind load and temperature load that should be considered in the engineering design of long-span bridges stipulated in the code, and to avoid the design of long-span bridges being too conservative

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