Seismic Bracing Yield Fuse for Lower Anchor Forces
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Solution Overview
Problem
Existing seismic bracing systems for nonstructural items in buildings require significant anchor force increases due to the 2012 IBC requirements, which can be costly and impractical, especially since commercially available bracing products were designed to be strong and rigid rather than ductile.
Innovation Solution
The introduction of a lightweight, compact seismic bracing yield fuse that allows for ductile yielding, reducing the required anchor forces by 250% and enabling the use of an Omega factor of 1.0 instead of 2.5, thus enhancing the cost-effectiveness and practicality of seismic bracing designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If strong and rigid brace connections are used to meet pre-2012 IBC requirements, then sufficient strength and stiffness are achieved, but anchor forces must be increased by 250% under 2012 IBC requirements
Solution Approach 1:
The invention changes the fundamental parameter of brace behavior from rigid to ductile yielding. By designing the brace connection to yield ductilely rather than remain rigid, the system absorbs seismic energy through controlled deformation, eliminating the need for 2.5x anchor force increases required by 2012 IBC for rigid connections
Solution Approach 2:
The invention adapts the ductile yielding concept from structural building braces to nonstructural brace applications. By copying the energy-absorbing ductile connection approach used in large structural systems and scaling it down to nonstructural items, the invention achieves both ductility and appropriate strength levels
2Reliability
If energy absorbing ductile connection devices are used in building braces, then ductile yielding is achieved, but the devices are too large and heavy for nonstructural items
Solution Approach 1:
The invention integrates the ductile yielding mechanism directly within the existing nonstructural brace components themselves, rather than adding separate external devices. The ductility is nested within the brace connection hardware, eliminating the need for large external energy-absorbing devices
Solution Approach 2:
The invention uses small, lightweight, inexpensive ductile elements that can be easily replaced after seismic events. These small yielding components are designed to fail in a controlled manner, providing ductility without the weight and cost of permanent structural-grade ductile devices
3Strength
If the brace assembly as a whole has sufficient strength, then pre-2012 IBC requirements are met, but the relative strength of individual components is not evaluated
Solution Approach 1:
The invention applies different strength characteristics to different components within the brace assembly. The connection hardware is specifically designed with ductile properties while the brace elements themselves maintain appropriate strength, creating localized quality differences that simplify overall evaluation
Solution Approach 2:
The invention segments the brace system into distinct functional components: ductile yielding connection elements and strength-providing brace elements. This segmentation allows each component to be evaluated and designed for its specific function, simplifying the overall assessment process
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 seismic bracing yield fuse effectively reduces the necessary anchor forces, allowing for more cost-effective and practical seismic bracing designs that meet the 2012 IBC requirements while providing superior brace performance through ductile yielding rather than sudden brittle failure.
Implementation Method 1
The fuse member is configured to undergo ductile yielding in a length dimension upon application of a tensile force along the length dimension of the fuse member
Data Source
AI summary
A seismic bracing yield fuse includes at least one housing member, and a fuse member housed within or mounted externally to the at least one housing member. The fuse member is configured to undergo ductile yielding in a length dimension upon application of a tensile force along the length dimension of the fuse member, and the at least one housing member is configured to accommodate a change in length of the fuse member resulting from the ductile yielding.