Embedded Post Base Connector Resisting Moment Forces
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Solution Overview
Problem
Existing connectors for anchoring posts to foundations struggle to effectively resist moment and uplift forces, especially in structures subjected to high wind loads, and can lead to moisture issues when the post is in direct contact with a wet concrete foundation.
Innovation Solution
A connector formed from a single sheet metal blank with overlapping front and back members that provide strong resistance to moment forces, elevate the post above the foundation, and incorporate wedging protrusions to resist uplift, using fasteners to secure the post and allowing for moisture drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the post is made from wood and placed directly on the foundation, then the connection is simple, but the end of the post absorbs moisture from water on the foundation surface
Solution Approach 1:
The patent introduces an intermediate plate as a mediator between the wooden post and the concrete foundation. This plate serves as a barrier that prevents moisture transfer from the wet foundation to the wood, while still allowing the post to be securely supported and connected. The intermediate plate resolves the contradiction by providing a protective interface without complicating the overall connection system.
2Ease of operation
If early U-shaped metal straps or tubular anchors are used, then the connector is simple to install, but the moment forces on the post are not adequately resisted
Solution Approach 1:
The patent transitions from simple U-shaped straps or tubular anchors to a three-dimensional welded structure consisting of a vertical plate with horizontal flanges. This dimensional enhancement provides multiple surfaces for fastener attachment and creates a more robust geometric configuration that effectively resists moment forces while maintaining ease of installation through pre-fabrication.
Solution Approach 2:
The connector combines different metal components (vertical plate, horizontal flanges, fasteners) welded together to form a composite structural assembly. This composite construction integrates the strengths of each component to achieve superior moment resistance compared to single-piece connectors, while the modular design keeps installation straightforward.
3Device complexity
If the post bears directly on the concrete foundation, then the structure is simple, but the post end absorbs moisture and the connection lacks moment resistance
Solution Approach 1:
The patent merges multiple functions into a single integrated connector assembly: the vertical plate provides moment resistance, the horizontal flanges offer bearing surfaces, and the welded construction ensures structural integrity. This unified design eliminates the need for separate moisture barriers and moment-resisting elements, achieving reliable protection against moisture and moment forces without significantly increasing overall structural complexity.
Data Source
AI summary
A connector is constructed so as to be embedded in a cementitious member and connect a post or other supported member to the cementitious member, such that the connection formed can resist rotational and bending moment forces transmitted to the connector by the post that it supports.