Calculation method for vertical displacement of immersed tunnel tube segments under vehicle load

A vertical displacement and vehicle load technology, applied in calculation, design optimization/simulation, special data processing applications, etc., can solve problems such as less research on displacement response and no consideration of shear deformation

Active Publication Date: 2017-06-30
ZHEJIANG UNIV CITY COLLEGE
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] At present, in the structural design of immersed tube tunnels at home and abroad, the vehicle load is mostly calculated as pseudo-static force, and there are few studies on the response of vehicle load to the displacement of immersed tube tunnels, and in the existing structural force calculation models of immersed tube tunnels, tube Nodes are treated as Euler beams without considering their shear deformation

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  • Calculation method for vertical displacement of immersed tunnel tube segments under vehicle load
  • Calculation method for vertical displacement of immersed tunnel tube segments under vehicle load
  • Calculation method for vertical displacement of immersed tunnel tube segments under vehicle load

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Embodiment Construction

[0082] The technical scheme of the present invention will be further described below in conjunction with the accompanying drawings of the description:

[0083] Such as Figure 1~6 As shown, the present invention proposes a specific embodiment of the calculation method for the vertical displacement of the pipe joint of the immersed tube tunnel under the vehicle load. The present invention takes the Ningbo Yongjiang immersed tube tunnel project as the background, and the structural parameters of the pipe joint are detailed in literature [2]. In the calculation, take the pipe joint weight γ=25kN / m 3 , the modulus of elasticity is E=3.45×10 4 MPa, shear coefficient κ=π 2 / 12 [19] , shear modulus G=1.25×10 4 Mpa; take the elastic resistance coefficient of the foundation as k=1×10 4 kN / m 2 , the foundation damping coefficient is c=5×10 2 kPa s. Take the joint shear stiffness k j =1×10 6 kN / m, bending stiffness k w =3×10 6 kN m / rad, joint shear damping coefficient c j =5...

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Abstract

The invention provides a calculation method for vertical displacement of immersed tunnel tube segments under a vehicle load. The method comprises the steps of simulating tube segments by adopting a Timoshenko girder, enabling a foundation to be equivalent to a series of spring elements and damper elements, which are connected in series, and building a tube segment-joint model, wherein each of an anti-shearing unit and an anti-bending unit in the joint model is formed by connecting a spring and a damper in parallel; and simplifying boundary conditions of the tube segments and considering the boundary conditions to be free-free, wherein the joint action is achieved through adding concentrated force and concentrated moment to the end parts of the tube segments, and the concentrated force and the concentrated moment on the adjacent end surfaces are equal in magnitude and opposite in direction. Through solving of a tube segment vibration mode function and building and solving of a tube segment power dynamic equation, an nth-order time coefficient as shown in the specification of a jth tube segment is solved by adopting a Newmark step-by-step integration method; and a vertical displacement response of any longitudinal position of each tube segment can be obtained by combining with a tube segment mode function.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and in particular relates to a method for calculating the vertical displacement of a tube joint of an immersed tube tunnel under vehicle load. Background technique [0002] The immersed tube tunnel is built on the bottom of the water and needs to be strictly sealed, so there are high requirements for the displacement control of the end of the tube joint. However, according to domestic and foreign engineering cases, some pipe joints of immersed tube tunnels cracked and leaked during the operation period, which brought great harm to the normal use of the tunnel. At present, most of the immersed tube tunnels built and under construction at home and abroad are road tunnels, so the vehicle load has a great influence on the displacement of pipe joints. In order to explore the influence of vehicle load on the displacement response of pipe joints and joints, to ensure the comfort of driv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20
Inventor 魏纲陆世杰朱田宇宋宥整姜婉青蔡诗淇洪子涵许讯黄絮洪文强
Owner ZHEJIANG UNIV CITY COLLEGE
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