Truss type punching shear resistant column cap structure in building storey adding and construction method

By adopting a truss-type punching shear-resistant column cap structure in the building addition, and using external cladding plates, connecting steel cladding plates, chord double angle steel and diagonal web angle steel to form a lightweight small truss, the problem of poor seismic performance of traditional flat slab column structures is solved, and the punching shear redundancy and structural ductility are significantly improved.

CN117287060BActive Publication Date: 2026-06-02HANGZHOU LANDSCAPE ARCHITECTURE DESIGN INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HANGZHOU LANDSCAPE ARCHITECTURE DESIGN INST CO LTD
Filing Date
2023-09-25
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Traditional flat slab-column structures have poor seismic performance in building additions, and there is a possibility of punching shear brittle failure at the column capitals, leading to continuous failure of the overall structure.

Method used

A truss-type punching shear column cap structure is adopted. By wrapping the original frame columns with gusset plates, connecting steel gusset plates, double angle steel for chord members and angle steel for diagonal web members to form a lightweight small truss, the interlocking force of concrete aggregate is enhanced, the shear bearing capacity is improved, and the internal force is redistributed at the slab-column joint.

Benefits of technology

It improved the ductility of the original frame columns under earthquakes, expanded the punching shear perimeter, significantly increased the punching shear redundancy, changed the brittle failure path, and enhanced the seismic performance of the structure.

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Abstract

The application discloses a truss type anti-punching column cap structure in building storey adding, which comprises a frame column, an outer wrapping board, a connecting steel wrapping board, a chord double angle steel and a diagonal web member angle steel, the outer wrapping board is fixed on the outer wall surface of the frame column through chemical anchor bolts, and the outer wrapping board surrounds and covers the frame column, the chord double angle steel is arranged on the connecting steel wrapping board, the upper and lower ends of the outer wrapping board are both provided with the chord double angle steel, the two ends of the diagonal web member angle steel are matched together with the chord double angle steel located at the upper and lower ends of the outer wrapping board, and the diagonal web member angle steel is not perpendicular to the frame column, and the diagonal web member angle steel is not parallel to the frame column. The application further discloses a construction method of the truss type column cap structure.
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