Damping elastic support treatment method for cracking of diagonal web members of steel box beams

By installing a damped elastic support device with initial stiffness on the inclined bels of the steel box girder, the fatigue cracking problem caused by stress concentration of the centralized stress of the dividing plate truss tube is solved, and the safety and service life of the structure are improved.

CN112813855BActive Publication Date: 2025-03-25广州珠江黄埔大桥建设有限公司 +1
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Patent Information

Application Number
CN202110088683.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-01-22
Publication Date
2025-03-25
Estimated Expiration
2041-01-22

AI Technical Summary

Technical Problem

The steel box girder plate truss pipes have stress concentration due to structural design defects, welding defects, heavy-duty traffic and other factors, causing structural fatigue cracks and cracks. The existing treatment methods cannot fully and effectively solve this problem.

Method used

Without changing the overall structure of the steel box beam, by modifying the original inclined abdominal rod and installing a damped elastic support device with initial stiffness, the stress concentration of the local structure is alleviated and the emergence and development of structural fatigue cracks are suppressed.

Benefits of technology

It effectively improves the fatigue performance of steel box girders, extends the service life of the structure, slows down or eliminates cracking diseases of truss-type dividing steel pipes, and ensures the safety and stability of the bridge.

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Abstract

The present invention discloses a damping elastic support treatment method for cracking of diagonal web members of steel box girders, comprising the following steps: Step 1: Cut and remove a certain length of the lower part of the diagonal web members of the original structure; Step 2: According to structural calculations and test results, obtain parameters related to stress and displacement of the steel box girder structure, and comprehensively design parameters of the elastic support damping device; Step 3: Lock the elastic support of the elastic support damping device, and then install the elastic support damping device. After completion, release the locking state of the elastic support damping device. The method of the present invention, without changing the overall structural form of the steel box girder, effectively alleviates the stress concentration and fatigue damage of the local structure of the diagonal web members by modifying the original diagonal web members to a certain extent and adding a damping elastic support with initial stiffness, inhibits the initiation, development and even cracking of fatigue cracks in the structure, improves the fatigue performance of the structure, and achieves the goal of extending the service life of the structure safely.
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