Estimation method of wave force submerging offshore bridge upper structure

A wave force and bridge technology, which is applied in the field of accurate estimation of wave force on the superstructure of submerged offshore bridges, can solve problems such as overestimation of wave force

Inactive Publication Date: 2018-01-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above two methods have been proved to overestimate the...

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  • Estimation method of wave force submerging offshore bridge upper structure
  • Estimation method of wave force submerging offshore bridge upper structure
  • Estimation method of wave force submerging offshore bridge upper structure

Examples

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Effect test

Embodiment 1

[0109] A method for estimating the wave force on the superstructure of a submerged offshore bridge is as follows: based on ideal fluid, the time factor can be separated for periodic wave problems, and the potential function of the flow field can be written as:

[0110] Φ(x,z,t)=φ(x,z)e -iωt (47) where x, z are space coordinates, t is time, ω is incident wave angular frequency (rad / s); among them, the complex velocity potential φ(x, z) still satisfies the Laplace governing equation:

[0111]

[0112] The boundary conditions satisfied by the flow field velocity potential function φ(x,z) are:

[0113] (1) Free interface

[0114] for x≤B 1 , x≥B J-1 ,z=0 (49)

[0115] in:

[0116] g——gravitational acceleration (9.8m / s 2 ).

[0117] (2) Seabed conditions

[0118] For z = -d (50)

[0119] (3) Structure surface

[0120] Bottom (51)

[0121] Side (52)

[0122] Such as figure 1 As shown, the entire wave-structure domain can be divided into J subdomains by using...

Embodiment 2

[0204] From the formula (45-46) in Example 1, the wave force generated by the incident wave with amplitude A and circular frequency ω on the submerged bridge superstructure can be calculated.

[0205] In order to further verify the calculation method of the wave action force proposed by the present invention, embodiment 2 compares the wave action force calculated by the formula (45-46) with the test results, for example figure 2 .

[0206]It can be seen that when the wave number kb1, the vertical wave force increases with (2) When the wave number kb1, the horizontal wave force increases with the increase of kb The increase remained basically the same, with only a slight downward trend. It can be seen that the theoretical model based on potential flow theory can better estimate the wave force acting on the bridge superstructure model. Considering that the potential flow theory simplifies the free liquid surface to a linear interface and satisfies the conservation of wave en...

Embodiment 3

[0208] In order to further simplify the calculation process, a simple calculation method for wave action can be established for a specific bridge structure. The geometric dimensions of the bridge structure are as Figure 3-4 shown.

[0209] Based on the calculation results of the potential flow theory model, a simple calculation formula corresponding to the bridge type can be fitted.

[0210] Horizontal wave force:

[0211] f H =ρghAC H (k 0 b) (1-93)

[0212] vertical wave force

[0213] f V =F B +ρgBAC V (k 0 b) (1-94)

[0214] in:

[0215] C V , C H —— Regarding the coefficient of wave number, the calculation formula is as follows:

[0216]

[0217]

[0218] In the formula:

[0219] k 0 ——wave number, which can be obtained from dispersion equation according to water depth and wave period;

[0220] b—half of the total span of the bridge superstructure;

[0221] c h1 ~c h6 and c v1 ~c v6 The values ​​are 0.08, -0.03, 2.25, 0.09, -0.88, 1.14 and -0...

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Abstract

The invention provides an estimation method of wave force submerging an offshore bridge upper structure. A theory accrual model of the wave action of a bridge upper structure in a submerging state isbuilt based on a potential flow wave theory, a control equation of the model is a Laplace's equation, boundary conditions such as impassable and impermeable characteristics of a free surface and a seabed and zero object plane normal velocity are met, a velocity field can be solved by solving a control equation and by the aid of continuity of velocity potential and horizontal velocity, and the waveaction force can be solved by the aid of a Bernoulli's equation. By a built wave action force computing method, maximum wave action force applied to an offshore bridge structure in the submerging state can be accurately calculated, and accuracy is obviously improved as compared with a previous method.

Description

technical field [0001] The invention relates to the wave force calculation of beam-slab structures in the offshore bridge engineering structure, in particular to an accurate estimation method for the wave force of the superstructure of the submerged offshore bridge. Background technique [0002] In recent decades, the economic development of coastal areas has put forward an increasing demand for rapid transportation networks, and the construction of bridges across the Gulf Strait has become an important part of the country's infrastructure. However, the offshore bridge structure is located in a complex marine environment and is vulnerable to typhoon waves and tsunami waves. The safety of these engineering structures has become a key factor to ensure the effectiveness of human transportation network in coastal areas. Under complex marine environmental conditions, the superstructure of offshore bridges will be subjected to direct wave forces, so its design must take into acco...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 方庆贺洪荣灿郭安薪李惠
Owner HARBIN INST OF TECH
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