Compression Strut Ledger Connection That Protects Veneer
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Solution Overview
Problem
Existing methods for attaching an outer structural member to the inner frame of a building often load the outer veneer, which is not designed to carry structural loads, potentially leading to premature failure and water intrusion.
Innovation Solution
A connection system using a compression strut with catches or stops and a connector plate that can be positioned at different locations along the compression strut, allowing the outer member to be held at a selected distance without directly loading the veneer, and tension fasteners that extend at an acute angle to both the compression strut and the vertical face of the wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If elongated bolts or screws are run through the outer covering to attach the outer structural member to the inner structural members, then the outer structural member can be securely attached, but the outer covering is loaded and disturbed, potentially leading to premature failure and water intrusion
Solution Approach 1:
The connection system is divided into separate functional components: a connector plate attached to the outer structural member, a compression strut that interfaces with the inner structural members, and attachment elements. This segmentation allows the outer covering to remain intact while the structural connection is established through coordinated action of multiple components rather than a single penetrating fastener
Solution Approach 2:
The compression strut acts as an intermediary element between the outer structural member and the inner structural members. It transfers loads without requiring fasteners to penetrate the outer covering, thereby protecting the veneer while establishing the structural connection
2Device complexity
If the outer structural member is held close to the outer covering, then the connection is compact, but moisture can be trapped between the outer structural member and the outer covering, leading to water intrusion
Solution Approach 1:
A spacer element is introduced as an intermediary component between the outer structural member and the outer covering. This spacer maintains a deliberate gap that allows moisture to drain or evaporate, preventing trapped moisture while keeping the overall connection compact through optimized spacing
Solution Approach 2:
The solution incorporates a water-resistant barrier or flashing element that directs moisture away from the connection area. This thin film or barrier prevents water intrusion while maintaining the compact arrangement of the connection components
3Ease of manufacture
If the outer covering is used to support the outer structural member, then the installation is simplified, but the outer covering is loaded beyond its design capacity, leading to premature failure
Solution Approach 1:
The structural support function is extracted from the outer covering and transferred to dedicated structural components (inner structural members and compression strut). The outer covering is taken out of the load-bearing path, allowing it to perform only its intended protective function while the structural connection is established through separate components
Solution Approach 2:
The compression strut serves as an intermediary that bridges the outer and inner structural systems without transferring loads to the outer covering. It mediates the connection by interfacing with the inner structural members, thereby protecting the outer covering from structural loads while maintaining installation simplicity
Data Source
AI summary
A connection and a method of making a connection between an outer member and one or more inner structural members of a structure such as a building, the connection having a compression strut having an inner portion and an outer portion, the inner portion being supported by one of the one or more inner structural members, the outer portion being in contact with the outer member, a connector plate engaging the compression strut and the outer member and one or more tension fasteners attaching the connector plate to one or more of the one or more inner structural members.