Continuity Ties for Prefabricated Shearwall Anchoring
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Solution Overview
Problem
Anchoring upper story shearwalls to lower story shearwalls in multi-story buildings is challenging due to the difficulty in properly securing structural members, which affects the building's resistance to lateral forces such as seismic activity, high winds, floods, and snow loads.
Innovation Solution
A prefabricated shearwall design featuring a central diaphragm with corrugations and reinforcing chords, along with a flat sill plate, enhances the anchoring mechanism by increasing cross-sectional area and ductility, and using tubular continuity ties to connect upper and lower shearwalls, distributing compressive forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If shearwalls are used on more than one story of a building, then the building's resistance to lateral forces is improved, but it becomes more difficult to properly anchor shearwalls on upper stories
Solution Approach 1:
The patent introduces continuity ties as intermediary elements that connect upper story shearwalls to lower story shearwalls. These ties serve as mediators that transfer lateral forces between stories, eliminating the need for direct anchoring of upper shearwalls to the foundation or lower structural elements. The continuity ties are specifically designed to facilitate this connection while maintaining structural integrity against lateral forces.
2Strength
If a corrugation is added to the central diaphragm to increase cross-sectional area and ductility, then resistance to lateral forces is improved, but device complexity increases
Solution Approach 1:
The patent applies corrugations (curved or folded profiles) to the central diaphragm of the shearwall. These corrugations increase the cross-sectional area and ductility of the diaphragm without requiring additional structural elements. The curved geometry of the corrugations provides enhanced lateral force resistance while maintaining a relatively simple monolithic structure, avoiding the need for complex multi-component assemblies.
3Strength
If reinforcing chords are affixed to the end sections of the central diaphragm, then resistance to lateral forces is improved, but device complexity increases
Solution Approach 1:
The patent combines the central diaphragm with reinforcing chords affixed to its end sections, creating a composite structural system. The chords and diaphragm work together to resist lateral forces, with the chords providing additional structural support at critical locations. This composite approach enhances strength while keeping the overall structure integrated rather than fragmented into numerous separate components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design significantly improves the resistance to lateral forces and ensures secure anchoring of upper story shearwalls to lower story shearwalls, enhancing the structural integrity of light-framed constructions against natural phenomena.
Implementation Method 1
The diaphragm further includes at least one corrugation extending in the height direction at least partially between the top and bottom edges. The corrugation increases the cross-sectional area and ductility of the diaphragm in the lateral direction
Implementation Method 2
The shearwall may further include a pair of reinforcing chords affixed to the end sections of the central diaphragm. The chords further improve the resistance of the shearwall to lateral forces
Implementation Method 3
In order to distribute the significant compressive forces exerted by the shearwall over a large surface area on the underlying support surface, the shearwall further includes a flat sill plate affixed to the bottom edge of the central diaphragm
Data Source
AI summary
A continuity tie is provided for connecting a prefabricated shearwall to a structural member above the prefabricated shearwall. In the preferred embodiment, the continuity tie is a steel tube with aligned openings for receiving a threaded rod therethrough. The tube is welded to the shearwall. A pair of tubes are preferably attached. Nuts attach the threaded rod to the tube. The threaded rod attaches to a structural member above the tube.