A method for analyzing shear lag effect of single-box three-cell section beam bridge

By constructing a shear lag warping displacement function and the principle of minimum potential energy, the analysis problem of shear lag effect in single-box three-cell beam bridges was solved, improving construction safety and accuracy.

CN115982803BActive Publication Date: 2025-12-05CHINA RAILWAY 21ST BUREAU GROUP FIFTH ENGINEERING CO LTD
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Patent Information

Application Number
CN202211283490.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-20
Publication Date
2025-12-05
Estimated Expiration
2042-10-20

AI Technical Summary

Technical Problem

Existing analytical methods cannot accurately analyze the shear lag effect of single-box three-cell beam bridges, which affects construction safety.

Method used

A shear lag warping displacement function is constructed using a quadratic parabolic function to calculate the normal strain and shear strain of the thin-walled box girder. The governing differential equations and boundary conditions of the single-box three-cell beam bridge are obtained through the principle of minimum potential energy and the method of integration by parts, and the shear lag effect is analyzed.

Benefits of technology

An easy-to-operate and programmatic analysis method is provided, which reduces the amount of manual calculation and improves the accuracy and safety of the construction process of single-box three-cell beam bridges.

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Abstract

The application discloses a kind of single-box three-chamber cross-section girder bridge shear lag effect analysis method, belong to bridge construction control technical field.The method includes the following steps: S1. with quadratic parabola function to build shear lag warping displacement function, select the coordinate at the location of half of box girder section, i.e. the wing plate longitudinal displacement function of single-box three-chamber thin-walled box girder considering shear lag effect is obtained;S2. calculate the normal strain and shear strain of upper and lower wing plate and web of thin-walled box girder;S3. calculate the strain energy of upper and lower wing plate and web of thin-walled box girder;S4. calculate the total potential energy of single-box three-chamber girder system;S5. according to the principle of minimum potential energy, simplification is carried out using the method of partial integration, and the control differential equation set and boundary conditions of single-box three-chamber thin-walled box girder considering shear lag effect are obtained.The application discloses a kind of single-box three-chamber cross-section girder bridge shear lag effect analysis method, and the prediction result of main girder stress and deformation is more in line with actual situation, improves the accuracy of single-box three-chamber cross-section girder bridge construction process, and higher safety.
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