Ductile Fluted Panel Sidelap Connections for Seismic Shear Strength
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Solution Overview
Problem
Traditional structural panel systems in buildings, particularly in seismic and high-wind prone areas, suffer from rapid loss of shear strength after reaching the ultimate load due to connection failures, leading to inadequate ductility and reduced lifespan.
Innovation Solution
The ductile fluted panel system enhances sidelap strength between adjacent panels and connection configurations to create buckling spans, allowing panels to buckle before connection failure, thereby maintaining prolonged diaphragm strength and ductility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If structural panels are solidly connected to each other and to load resisting members to withstand shear forces, then the structural integrity and load-bearing capacity are improved, but the ductility and lifespan of the system deteriorate due to rapid loss of shear strength after ultimate load
Solution Approach 1:
The panel connection system is segmented into multiple functional zones: rigid connections at panel ends for load transfer, flexible sidelap connections for ductility, and controlled buckling spans for energy dissipation. This segmentation allows different parts of the connection system to serve different purposes - maintaining strength where needed while providing flexibility where required for ductile behavior.
Solution Approach 2:
The connection parameters are changed from traditional rigid mechanical connections to a hybrid system incorporating rigid end connections with flexible sidelap connections. The flexible connections allow for larger deformations and panel buckling, changing the mechanical parameters from stiff to more compliant, thereby improving ductility while maintaining overall structural integrity.
2Ease of manufacture
If traditional connection configurations are used to join structural panels, then the manufacturing and installation process is simple, but the system experiences rapid degradation of shear strength after reaching ultimate load
Solution Approach 1:
The connection system is divided into modular components - end connections and sidelap connections - that can be manufactured and installed separately. This modular approach maintains ease of construction while enabling the complex behavior needed for prolonged lifespan through controlled panel buckling and energy dissipation.
Solution Approach 2:
The connection system transitions from static rigid connections to a dynamic system where panels can buckle and connections can rotate or deform plastically. This dynamic behavior allows the structure to absorb energy through controlled deformations, extending the service life and maintaining functionality after ultimate load events.
3Stability of the object's composition
If rigid connections are used between structural panels to prevent displacement, then the structural stability is improved, but the system lacks ductility and fails catastrophically after ultimate load
Solution Approach 1:
Different connection qualities are applied locally - rigid connections at panel ends for stability and load transfer, flexible connections at sidelaps for ductility. This local differentiation allows the structure to maintain overall stability while providing localized flexibility for energy dissipation and ductile behavior during seismic or wind events.
Solution Approach 2:
The connection system is segmented into rigid and flexible zones, allowing each zone to perform its specific function - rigid zones maintain structural stability and load path continuity, while flexible zones provide ductility and energy dissipation capacity through controlled deformations and panel buckling.
Data Source
AI summary
The invention relates to structural panel systems which utilize different configurations to increase the flexibility of the panel systems. The increased flexibility of the panel systems may be achieved through the use of improved connection patterns and/or improved sidelap strength. The improved sidelap strength may be achieved through the use of a reinforcing member between edges of the panels or other sidelap configurations that improve the strength of the system along the sidelaps. The increased flexibility may also be achieved through the use of orienting flutes of the panels in the same direction as the supports members of the panel systems. The different aspects of the invention that improve the flexibility of the systems may be utilized alone or in combination with each other to improve the wall panel systems or roof panel systems, or combinations thereof, to improve the displacement capacity of the panel systems for in-plane shear loading.