Ribbed Metal Frame Member for Shear Strength
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Solution Overview
Problem
Stick frame construction buildings face challenges in increasing the shear strength of their vertical components, particularly in resisting in-plane lateral forces such as wind and earthquakes, which can lead to racking and structural damage.
Innovation Solution
A support wall frame system featuring a metal frame member with a series of ribs and stiffeners, integrated with an end track, designed to enhance shear strength and prevent twisting, utilizing a geometric configuration that includes inwardly directed ribs and detents for secure interlocking and increased axial load capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If standard stick frame construction is used, then the frame is lightweight and easy to construct, but the shear strength of vertical components is insufficient to resist in-plane lateral forces
Solution Approach 1:
The frame member is segmented into multiple functional components: flanges at the ends for connection, a body portion for structural support, and multiple ribs extending from the body. This segmentation allows each component to perform its specific function optimally while maintaining overall shear strength without excessive complexity
Solution Approach 2:
Ribs are added as a third dimensional feature extending from the flat frame member body, transforming it from a two-dimensional cross-section to a three-dimensional structure. This dimensional addition significantly increases shear strength and resistance to in-plane lateral forces without substantially increasing weight or complicating the construction process
2Strength
If heavier gauge studs are used to increase shear strength, then the frame resists racking better, but the weight and cost of the structure increases
Solution Approach 1:
The frame member combines the base metal material with added rib structures to create a composite-like configuration. This allows the same material gauge to achieve higher effective strength through geometric optimization, avoiding the need to increase material weight while still resisting racking forces effectively
3Strength
If additional reinforcement is added to prevent racking, then the structural integrity improves, but the ease of construction decreases
Solution Approach 1:
The ribs are merged as integral parts of the frame member body, formed simultaneously with the main structure during manufacturing. This integration eliminates the need for separate assembly steps to attach reinforcement elements, maintaining ease of construction while providing enhanced structural integrity against racking forces
Data Source
AI summary
A support wall frame system includes at least one end track, and a frame member received within the at least one end track. Advantageously, the frame member is statically affixed to the at least one end track. The at least one track includes at least one detent spaced from each shoulder of the track to allow bending the at least one track from a single and unitary sheet of metal. Each of the bottom end track and the top end track includes a first opening disposed along a first shoulder of the track base and the first track side wall, and a second opening disposed along a second shoulder of the track base and the second track side wall. The first opening and the second opening each has a substantially cross-shape. A third opening may be formed along the track base.