Bracket Assembly for Stacked Stud Wall Bending Resistance
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Solution Overview
Problem
Directly stacked stud walls in buildings often lack the necessary bending strength to comply with building fire codes, especially when there are no intervening floor-support joists or I-beams, and this is particularly problematic with cold-formed steel studs which have poor torsion resistance.
Innovation Solution
A bracket assembly comprising upper and lower brackets and a post member that connects the frames of directly stacked stud walls, providing adjustable length to fit between studs and featuring a post member that extends through aligned openings in the top and bottom plates to resist lateral bending, ensuring compliance with building codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If stud walls are directly stacked without intervening floor-support joists or I-beams, then installation flexibility and structural simplicity are improved, but bending strength and compliance with building fire codes deteriorate
Solution Approach 1:
The patent introduces a bracket assembly as an intermediary component between directly stacked stud walls. The bracket includes horizontal members that connect to studs in both upper and lower walls, and vertical members that extend through aligned openings in top and bottom plates to provide lateral bracing. This intermediary structure enables direct stacking installation while simultaneously providing the lateral support needed to resist bending forces and meet fire code requirements.
2Strength
If cold-formed steel studs are used, then compressive strength and fire resistance are improved, but torsion resistance and bending strength at plate interfaces deteriorate
Solution Approach 1:
The patent addresses the torsion weakness of CFS studs by introducing bracing in a different spatial dimension. The vertical members of the bracket assembly extend through the top and bottom plates and provide lateral support perpendicular to the plane of the wall, creating a three-dimensional bracing system that resists torsional forces and lateral bending that the CFS studs cannot resist on their own.
3Strength
If rail-like top and bottom plates are used, then compressive and bending resistance are improved, but torsion resistance deteriorates causing twisting under lateral force
Solution Approach 1:
The patent creates a composite structural system by combining the rail-like top and bottom plates with the bracket assembly. The bracket's vertical members that extend through the plates work together with the plates to form a composite bracing system. This composite structure maintains the good compressive and bending resistance of the rail plates while adding torsion resistance through the vertical bracing elements, preventing twisting under lateral force.
Data Source
AI summary
A bracket assembly and installation method are provided that connects and reinforces upper and lower stud wall frames in a stacked relationship. The bracket assembly includes upper and lower brackets connectible across the width inside of a pair of parallel, aligned studs of the upper and lower stud wall frames, respectively, and a pair of post members that interconnect the upper and lower brackets. In the installation method, aligned openings are provided in the top plate of the lower stud wall frame and the bottom plate of the upper stud wall frame. The post members are inserted through the aligned openings and are connected between the first and second brackets to resist bending at the interface between the stacked upper and lower stud walls. Each bracket is length-adjustable to accommodate variations in the width between the pair of parallel studs.