A Stiffness Influence Line Analysis Method for Shear Key Shear Force of Immersed Tube Tunnel Joints

Abstract

A stiffness influence line analysis method of the shear force of the joint shear key of the immersed tunnel: 1) Construct the longitudinal model of the immersed tunnel; 2) Calculate the settlement δ and vertical stiffness k of any spring; 3) Calculate n springs within the full length Average stiffness of the spring and stiffness change ratio α i , draw the distribution diagram of stiffness change; 4) Under the overall temperature rise condition, the longitudinal model of the immersed tube is replaced by the infinitely long elastic foundation beam model. 5) Apply q uniformly distributed load to a certain micro-segment [-X 0 ,X 0 ] The internal stiffness is supported by becomes k 2 The infinitely long elastic foundation beam model of is equivalent to the concentrated force q 1 Average stiffness under action Supported infinitely long beam model. 6) Using the formula get concentration q 1 relationship with q. 7) Use q 1 Solve for the shear force value at any cross-section location. 8) Draw the stiffness influence line of the shear force of the shear key at the joint position under investigation. By multiplying the stiffness influence line with the foundation stiffness change distribution diagram, the value of the joint shear key shear force caused by the foundation stiffness change is obtained.

Description

technical field [0001] The invention belongs to the technical field of immersed tube tunnel design, and in particular relates to a simplified calculation method for the shear force key shear force of immersed tube tunnel joints, in particular to a method for calculating the shear force key shear force of immersed tube tunnel joint joints caused by changes in foundation stiffness by using stiffness influence lines. power analysis method. Background technique [0002] The force of immersed tube tunnel is a high-order statically indeterminate problem of the overlying load, immersed tube structure, joints and foundation soil. According to the composition of the vertical structure system, immersed tube tunnels can be divided into two types, one is the integral tube segment immersed tube tunnel, and the other is the segmental tube segment immersed tube tunnel. The integral pipe section immersed tunnel is composed of several pipe sections and joints between adjacent pipe sections ...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a stiffness influence line analysis method for the shear force of the shear key of the joint of the immersed tube tunnel, so as to solve the simplified calculation of the shear force of the shear key of the joint of the immersed tube tunnel, facilitate the design of the shear key, and quickly determine the feasibility of the basic scheme sexual issues

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