Method for calculating wave current force borne by box type upper structure of sea-crossing bridge

A wave-current force and box-type technology, which is applied in the force calculation field of cross-sea bridges, can solve the problems of predicting extreme wave force, difference in wave-current interaction, limited wave force, etc.

Active Publication Date: 2020-07-28
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, research on wave forces on box girder bridges is very limited and there is no precise formula for predicting extreme wave forces
Furthermore, there are significant differences between wave-current interactions and separate wave

Method used

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  • Method for calculating wave current force borne by box type upper structure of sea-crossing bridge
  • Method for calculating wave current force borne by box type upper structure of sea-crossing bridge
  • Method for calculating wave current force borne by box type upper structure of sea-crossing bridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] In order to verify the accuracy of the proposed method for calculating the wave and current force on the box-shaped superstructure of cross-sea bridges, the numerical simulation ( figure 2 Shown) the result is compared with the calculation result of formula 1-10, and the comparison result is as follows image 3 and Table 5;

[0066] Table 5. Comparison of the numerical simulation results acting on the superstructure of the box girder and the calculation results of the method proposed by the invention

[0067]

[0068]

[0069] image 3 The scatter plots and statistical values ​​shown in show that the proposed calculation method is accurate in calculating the maximum horizontal and vertical wave flow forces, and the comparison of the calculated values ​​and numerical results is given in Table 5, where a Numerical simulations were performed for conditions different from those shown in the figure to verify the proposed equations. Compared with the numerical resul...

Embodiment 2

[0071] In order to further verify the superiority of the proposed method, the proposed calculation method is compared with the existing calculation method for estimating the wave force on the T-beam superstructure.

[0072] McPherson (2008) proposed a new method based on existing methods and used the results of a large-scale 3D wave experiment conducted at Texas A&M University to calculate the horizontal and vertical forces on a typical bridge section. Due to its simple form and good accuracy, the method proposed by McPherson can be used to estimate wave forces on typical bridge sections in the United States.

[0073] Use the formula proposed by McPherson to calculate the maximum wave force on a box girder. At this time, H=6m, T=8s, d=20m, U 0 =0m / s,C s =0. Also, using Table 1 and figure 1 Box girder dimensions shown in . The horizontal force and vertical force equations are listed below:

[0074] f V =F hydrostatic +F birdge +F air (11)

[0075] f hydrostatic =γδ...

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Abstract

The invention discloses a method for calculating wave current force borne by a box type upper structure of a sea-crossing bridge. Based on a numerical analysis result of the influence offlow rate, wave characteristics, the immersion coefficient and the geometrical shape of the box girder on the wave current force on the upper structure of the box girder and in combination with a least square algorithm and regression analysis, the immersion coefficient, the dimensionless bridge deck thickness, the dimensionless bridge deck length and the flow velocity are converted into quantized values composed of functions and fitting coefficients, and transverse and vertical wave force borne by the upper structure of the box girder can be simply and conveniently estimated in the form of the product of the gravity of the box girder and the quantized values. The estimation method for calculating the wave current force borne by the upper structure of the sea-crossing bridge box type is applied; the maximum wave current force borne by the box type upper structure of the sea-crossing bridge under different flow rates, wave characteristics, immersion coefficients and box girder geometrical shapes can be simply, conveniently and accurately calculated, and the problem that the wave current force borne by the box girder structure under the combined action of waves and currents cannot be estimated through an existing method is solved.

Description

technical field [0001] The invention relates to the technical field of force calculation of sea-crossing bridges, in particular to a method for calculating the wave and current force on the box-type superstructure of a sea-crossing bridge. Background technique [0002] In recent years, natural disasters such as Hurricane Katrina (2005), Hurricane Ivan (2004) in the United States, and Typhoon Sanmai (2006) in eastern China have wreaked havoc on infrastructure and coastal structures. These extreme hazards have caused enormous damage to coastal bridges in shallow water environments near the coast. Coastal bridges are only designed to resist the usual wave forces where the water surface is often well below the height of the beams, but these extreme hazards often result in large rises in the water level, causing large waves to act directly on the beams, usually resting at their own weight on piers or connected by weak links . In such extreme cases, wave forces on coastal bridge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/13G06F30/28E01D2/04G06F113/08G06F119/14G06F111/10
CPCE01D2/04
Inventor 黄博任青阳崔晓璐祝兵颜挺毅万通杨志莹程梽殷瑞涛
Owner CHONGQING JIAOTONG UNIVERSITY
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