Joist Tie With Ribs For Axial Load Transfer
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Solution Overview
Problem
Existing structural decking systems face challenges in transferring axial loads between joists due to the thickness of axial transfer members, which prevents efficient connection between structural decking, joists, and support members, requiring multiple connections and complicating assembly processes.
Innovation Solution
A joist tie with reduced thickness and enhanced strength, featuring one or more ribs and flanges, is designed to fit within joist cavities, allowing for a single connection point between the decking, tie, and joists, facilitating easier assembly and load transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional axial transfer members (steel plates, angles) are used to connect joists, then axial load transfer between joists is achieved, but the thickness of these members prevents efficient connection between structural decking, joists, and support members, requiring multiple connections
Solution Approach 1:
The joist tie is designed with a nested structure where the web fits within the joist cavity, and flanges extend outward to connect with decking and support members. This nesting allows the tie to transfer axial loads between joists while maintaining a compact profile that enables single-connection fastening through the decking, tie, and joist assembly.
Solution Approach 2:
The joist tie uses reduced thickness parameters compared to traditional axial transfer members. By optimizing the thickness of the web and flanges, the design enables fasteners to penetrate through the decking, tie, and joist in a single connection, eliminating the need for multiple connections while maintaining sufficient axial load transfer capability.
2Strength
If thicker axial transfer members are used to ensure sufficient strength for load transfer, then structural integrity is improved, but assembly complexity increases and installation time is extended
Solution Approach 1:
The joist tie optimizes thickness parameters to achieve the minimum required strength for axial load transfer. The web thickness and flange dimensions are carefully selected to provide sufficient structural integrity while remaining thin enough to allow single-connection fastening, thereby accelerating assembly without compromising strength.
Solution Approach 2:
The joist tie is segmented into distinct functional regions: the web for load transfer within the joist cavity, and flanges for connection with decking and support members. This segmentation allows each portion to be optimized independently - the web for strength and the flanges for connection efficiency - resulting in both high structural integrity and fast assembly.
3Device complexity
If reduced thickness joist tie is used to enable single connection, then assembly complexity is reduced, but load transfer capability must be maintained through enhanced strength features
Solution Approach 1:
The joist tie applies local quality by concentrating structural reinforcement where needed: the web is positioned within the joist cavity to maximize load transfer path, and flanges are extended at connection points to provide adequate bearing area. This localized reinforcement maintains high load transfer capability despite the overall reduced thickness of the member.
Solution Approach 2:
The joist tie functions as a composite structural element combining the steel tie member with the surrounding joist cavity and connection assemblies. The tie web works in conjunction with the joist structure to transfer loads, while the flanges create a composite connection with the decking and support members, achieving high strength through this composite action rather than relying solely on the tie's own thickness.
Data Source
AI summary
A joist tie may be designed to increase the strength of the joist tie and reduce the thickness of the joist tie, in order to provide the desired strength and the ability to make connections that operatively couple structural decking, the joist tie, and joists together using a single connector in one or more locations. The joist tie may be strengthened through the use of one or more ribs and/or one or more flanges. The one or more ribs may be formed to fit within one or more cavities within adjacent joists located in series. As such, the shape of the joist tie may be dimensioned in order to allow the joist tie to be placed on a first joist and a second joist without having to be attached until after assembly of the structural decking on top of the joist tie and joists.