Buckling Restrained Braces With Spring Lateral Support
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Solution Overview
Problem
Existing buckling restrained braces face challenges in preventing buckling of the core rod under compressive loads, which can lead to stress concentrations and premature failure, due to the lack of effective lateral support and binding issues during plastic deformation.
Innovation Solution
A buckling restrained brace design featuring a core rod surrounded by a buckling restraining tube with incremental lateral support from spacers within an exterior support tube, and an axial spring mechanism to provide continuous lateral support and prevent binding, allowing the core rod to deform without buckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a buckling restraining tube is used to provide lateral support to the core rod, then buckling is prevented, but binding issues occur during plastic deformation
Solution Approach 1:
The continuous buckling restraining tube is segmented by introducing spacers at intervals, creating discrete support zones that allow controlled movement and prevent binding during plastic deformation while maintaining lateral support stability
Solution Approach 2:
A polymer layer is introduced as an intermediary between the core rod and the buckling restraining tube, allowing relative movement and preventing binding while the tube continues to provide lateral support against buckling
2Stability of the object's composition
If grout or cement is used to fill the annular layer between the yielding core and metal shell, then lateral support is provided, but binding occurs during plastic deformation
Solution Approach 1:
The grout or cement material is completely removed from the annular layer between the yielding core and metal shell, eliminating the binding problem while the metal shell continues to provide lateral support through direct contact with the core
Solution Approach 2:
A polymer layer is introduced as an intermediary between the core rod and the buckling restraining tube, allowing relative movement and preventing binding while the tube continues to provide lateral support against buckling
3Adaptability or versatility
If the sleeve is configured to allow the core element to lengthen under tensile forces, then tensile deformation is accommodated, but the core element may buckle under compressive forces
Solution Approach 1:
The buckling restraining tube is segmented by spacers into discrete support zones, providing lateral support during compression while allowing the core rod to lengthen freely during tension
Solution Approach 2:
Lateral support is provided locally at specific intervals through the spacers rather than continuously, allowing the core rod to deform axially without restriction while preventing buckling at critical locations
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
The design effectively prevents buckling and binding of the core rod under cyclic tensile and compressive forces, ensuring the structure's integrity by providing continuous lateral support and accommodating length changes, thus enhancing the brace's ability to absorb seismic and other loads without premature failure.
Implementation Method 1
A spring is disposed within the sleeve member, the spring is located between and abutting the end of the buckling restraining tube and the end plate assembly of the buckling restrained brace
Implementation Method 2
Plastic deformation of the yielding core element under applied forces can absorb a significant amount of energy
Data Source
AI summary
Buckling restrained braces may include a core rod and a buckling restraining tube concentrically surrounding at least a majority of a longitudinal length of the core rod. The buckling restraining tube may be configured to inhibit buckling of the core rod upon compressive loading of the core rod. An end plate assembly may be attached, and longitudinally movable with respect, to an end of the core rod, the end plate assembly being located at a longitudinal end of the buckling restrained brace. A sleeve member may concentrically surround an end of the buckling restraining tube, the sleeve member affixed to the end plate assembly. A spring may be located laterally between the core rod and the sleeve member of the end plate assembly and longitudinally between, and in contact with, an end of the buckling restraining tube and a portion of the end plate assembly.