H-Section Steel Core Hysteresis Brace Buckling Prevention
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Solution Overview
Problem
Conventional steel cores with minus or plus type cross-sections are prone to warping and torsion during fabrication due to heat-induced deformation during welding, leading to complex fabrication processes and potential failures in assembly with main-body steel frames.
Innovation Solution
An axially yielding elasto-plastic hysteresis brace is designed with an H-section steel core, where both ends are exposed and covered by a buckling-restraining member with an unbonded layer and a steel pipe, and reinforcing plates are welded to the flanges, with the insertion length of these plates set between 2B and 3B or 2H and 3H to enhance rigidity and prevent buckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel plates are welded to form a cross-shaped steel core, then the steel core gains rigidity, but the steel core develops warping and torsion due to welding heat
Solution Approach 1:
The steel core is divided into multiple H-shaped steel sections connected by reinforcing plates. Each H-shaped steel section maintains its structural integrity separately, and the reinforcing plates connect them to form the cross-shaped configuration, reducing cumulative welding heat effects
Solution Approach 2:
Multiple H-shaped steel sections are combined with reinforcing plates to form a cross-shaped steel core that achieves the required rigidity while distributing welding heat across multiple connection points rather than concentrating it in a single cross-junction
2Strength
If reinforcing plates are welded to flanges, then bending and torsion rigidity increase, but fabrication complexity increases due to precision requirements
Solution Approach 1:
Reinforcing plates are strategically placed only at critical locations where rigidity enhancement is most needed - specifically at the flanges of H-shaped steel sections. This localized reinforcement achieves the required structural performance while minimizing the number of welding operations and associated complexity
Solution Approach 2:
The H-shaped steel sections are prepared with pre-drilled holes and predetermined welding positions before assembly. The reinforcing plates are positioned and temporarily fixed prior to final welding, ensuring alignment accuracy and reducing the need for complex adjustment procedures during fabrication
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration increases bending and torsion rigidity, reducing the likelihood of warping and torsion, simplifies the fabrication process, and enhances the steel core's resistance to plastic deformation and buckling, while maintaining the performance of the axially yielding elasto-plastic hysteresis brace.
Implementation Method 1
one of a plurality of reinforcing plates 16 is welded to each outer surface of each flange 11b
Implementation Method 2
a buckling-restraining member 13 which covers an outer periphery of the H-section steel 11 via an unbonded layer 14, with both ends 11d of the H-section steel 11 in the longitudinal direction being exposed, thereby preventing buckling of the steel core
Implementation Method 3
an unbonded layer 14 which is filled between the H-section steel 11 and the buckling-restraining member 13
Data Source
AI summary
The present invention relates to an axially yielding elasto-plastic hysteresis brace including an H-section steel as a steel core, a buckling-restraining member covering an outer periphery of the H-section steel, an unbonded layer filled between the steel core and the buckling-restraining member, and a square steel pipe covering the outer periphery of the buckling-restraining member for reinforcement. For both ends of the H-section steel, one reinforcing plate is welded to each outer surface of each flange so as to be overlapped therewith. The buckling-restraining member is installed so that each reinforcing plate is inserted to the buckling-restraining member through an end thereof by a predetermined length L. And, where the width of the H-section steel as a steel core is given as B and the height thereof is given as H, an insertion length L of each reinforcing plate is set in a range of 2B≦L≦3B and also 2H≦L≦3H.