Joint between concrete-filled steel pipe columns and steel beams
Rod-shaped protrusions on the inner surface of CFT column steel pipes address the challenges of achieving optimal width-to-thickness ratios and cost control, enhancing the performance and force transmission in CFT structures.
JP2026086511APending Publication Date: 2026-05-26KONOIKE CONSTR LTD
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- KONOIKE CONSTR LTD
- Filing Date
- 2026-01-30
- Publication Date
- 2026-05-26
AI Technical Summary
Technical Problem
Existing CFT column designs face challenges in achieving a desirable width-to-thickness ratio while controlling costs, particularly in rectangular cross-sections, and in effectively transmitting vertical forces from beams to both the column steel tube and concrete.
Method used
Providing rod-shaped protrusions on the inner surface of the column steel pipe, allowing for controlled width-to-thickness ratios and improved force transmission, especially in rectangular cross-sections, thereby reducing thickness variations and costs.
Benefits of technology
Enhances the performance of CFT columns by improving the integrity between the column steel pipe and concrete, allowing for uniform thickness distribution and reduced costs, while effectively transmitting vertical forces.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 2026086511000001_ABST
Abstract
This invention provides a joint between a concrete-filled steel pipe column and a steel beam in a column-beam connection of a CFT structure, which allows for free control of the performance of the CFT column and the width-to-thickness ratio of the column steel pipe. [Solution] The joint between the concrete-filled steel pipe column and the steel beam 2 consists of a concrete-filled steel pipe column, in which concrete is filled inside the column steel pipe 1, and upper and lower flanges 2a, 2c and a web 2b. At the joint between the column steel pipe 1 and the steel beam 2 that is joined to the column steel pipe 1, a joint steel pipe 5 thicker than the upper and lower column steel pipes 1 is interposed in the section where the ends of the steel beam 2 of the concrete-filled steel pipe column are joined, and multiple rod-shaped protrusions are provided on the inner surface of the column steel pipe 1. By providing rod-shaped protrusions on the inner surface of the column steel pipe 1, vertical forces from the steel beam 2 can be transmitted to the column steel pipe 1, improving the integrity between the column steel pipe 1 and the column concrete. In addition, the width-to-thickness ratio of the column steel pipe is made smaller, improving the performance of the CFT column.
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