Method for analyzing stiffness influence lines of shear of shear keys of joints of immersed tube tunnel

Abstract

The invention discloses a method for analyzing stiffness influence lines of shear of shear keys of joints of an immersed tube tunnel. The method includes 1), constructing a longitudinal model of the immersed tube tunnel; 2), computing sedimentation delta and the vertical stiffness k of an optional spring; 3), computing the average stiffness and stiffness variation ratios alpha of n springs within a total-length range, and drawing a stiffness variation distribution graph; 4), replacing the longitudinal model of the immersed tube tunnel by an indefinite-length elastic foundation beam model under an integral heating working condition; 5), enabling the indefinite-length elastic foundation beam model to be equivalent to an indefinite-length beam model supported by the average stiffness under the effect of concentrated force q1; 6) solving a relation between the concentrated force q1 and force q; 7), solving a shear value at an optional section-side position by the aid of the concentrated force q1; 8), drawing a stiffness influence line of the shear of the shear key at an inspected joint position. The stiffness support in a certain miniature section [-X<0>, X<0>] under uniformly distributed load of the force q is changed into k<2> by the infinite-length elastic foundation beam model. The method has the advantages that the stiffness influence lines are multiplied by the foundation stiffness variation distribution graph to obtain the values of the shear of the shear keys of the joints, and the shear is caused due to variation of the foundation stiffness.

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 ...

AI Technical Summary

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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