Method for predicting the out-of-plane bending stiffness of a diaphragm, and method for designing the diaphragm plate thickness of a steel pipe joint.

An analytical model using rotational springs and polygonal elements addresses the limitations of existing methods, enabling accurate prediction and design of diaphragm stiffness in steel pipe joints with different dimensions, enhancing joint performance.

JP7868537B2Active Publication Date: 2026-06-02JFE STEEL CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
JFE STEEL CORP
Filing Date
2023-03-15
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing methods for predicting the out-of-plane bending stiffness of diaphragms in steel pipe joints with different dimensions are limited, particularly when there is no eccentricity, and do not accurately consider corner dimensions, leading to complex calculations and potential inaccuracies.

Method used

An analytical model is developed to predict the bending rigidity of diaphragms using a combination of first and second polygonal elements connected by rotational springs, considering nodes and edges of steel pipes with different dimensions, allowing for accurate evaluation of out-of-plane bending stiffness.

Benefits of technology

The method enables easy and accurate prediction of diaphragm stiffness, facilitating the selection of appropriate steel plate thickness for joints, thereby improving the design of steel pipe-diaphragm elastic spring joints.

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Patent Text Reader

Abstract

To provide an analytic modeling method and a prediction method for an out-of-plane bending rigidity of a diaphragm, which can simply and precisely predict when steel pipes having different sizes are joined through a through diaphragm.SOLUTION: For a joint at which steel pipes having different sizes are joined through a through diaphragm by a prescribed arrangement, four or more prescribed nodes on a board thickness center face of the diaphragm in plan view are previously selected, and an analytic model of the joint, which consists of a plurality of straight sides connecting the selected nodes and is connected so as to be bendable by a rotary spring at one of the sides and divided into a plurality of polygonal elements considered to be rigid bodies, is set. When load is added to an upper member, an out-of-plane bending rigidity of the diaphragm is predicted by synthesizing shearing rigidity of the prescribed polygonal elements to the bending rigidity of the diaphragm calculated based on total sum of strain energy of the rotary spring associated with displacement occurred at that time, load and displacement.SELECTED DRAWING: Figure 1
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