Buckling-Restrained Brace Mounting With Elongated-Hole Position Adjustment
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Solution Overview
Problem
The existing buckling-restrained braces face challenges in easy mounting on structures due to manufacturing and construction errors, and they suffer from deterioration in seismic resistance and damping performance due to initial axial forces introduced during construction.
Innovation Solution
The proposed buckling-restrained brace incorporates a core, a restrainer, a stiffening member, and a connector with an elongated hole as a position adjustment mechanism. This mechanism allows for easy adjustment of the relative position between the connector and the core or stiffening member, facilitating mounting and releasing initial axial forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pin-joining is used to improve designability, then ease of manufacture is improved, but mounting difficulty increases due to manufacturing and construction errors
Solution Approach 1:
The connector is designed with a movable structure that includes an elongated hole, allowing dynamic adjustment of the connection position during mounting. This enables the connector to adapt to manufacturing and construction errors while maintaining the pin-joining design simplicity.
Solution Approach 2:
The elongated hole provides a range of positional parameters that can be adjusted during mounting. By changing the insertion position within the elongated hole, the system accommodates dimensional variations without requiring complex manufacturing or assembly procedures.
2Stability of the object's composition
If the buckling-restrained brace is rigidly fixed to prevent buckling, then structural stability is improved, but initial axial force from construction loads increases
Solution Approach 1:
The connector incorporates a movable component that allows axial displacement between the core and the structure. This dynamic capability enables the brace to accommodate construction-induced axial forces while maintaining buckling restraint functionality during seismic events.
Solution Approach 2:
The movable connector structure is designed in advance to accommodate expected construction loads. The elongated hole and movable components are pre-configured to allow axial movement during construction, preventing the accumulation of harmful initial axial forces before the structure enters service.
3Strength
If the connector is firmly fixed to the core to ensure load transfer, then strength is improved, but adjustability of relative position is reduced
Solution Approach 1:
The connector uses a movable connection structure with an elongated hole that provides both strength and adjustability. The movable component can be positioned at different locations within the elongated hole to achieve the desired relative position, while still maintaining strong load transfer capability through rigid connection elements.
Solution Approach 2:
The connector is divided into multiple components including a movable part and a fixed part. This segmentation allows independent optimization of each component - the movable part provides adjustability while the rigid connection elements ensure strong load transfer. The components work together to satisfy both strength and adaptability requirements.
Data Source
AI summary
A buckling-restrained brace includes a core, a restrainer encasing the core from an outer side thereof, a stiffening member joined to the core in a state where a part of the stiffening member is disposed inside the restrainer, and a connector having a first end portion that is pin-joined to the structure and a second end portion that is joined to at least one of the core and the stiffening member, in which an elongated hole is provided in at least one of the core, the stiffening member, and the connector as a position adjustment mechanism configured to adjust a relative position between the connector and at least one of the core and the stiffening member.