Modular Ceiling Grid Seismic Load Transfer
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Solution Overview
Problem
Modular ceiling structures face challenges in withstanding seismic loads, which can compromise the load path and lead to ceiling failure, especially in seismically active regions where heavy equipment is stored and a walkable ceiling deck is desired for maintenance access.
Innovation Solution
A modular ceiling grid system featuring larger, longer main runners with mechanically fastened cross-tees that can transfer seismic forces without additional overhead support, providing a stable diaphragm to meet aggressive seismic codes and accommodate heavy equipment and walkable decking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional two-part ceiling system with hanger straps and wire is used, then installation is simpler for short spans, but the ceiling cannot withstand seismic loads or support heavy equipment in long span installations
Solution Approach 1:
The ceiling system is divided into modular components including main runners, cross-tees, and drop-in panels that can be independently assembled and configured. This segmentation allows the system to achieve high strength through proper mechanical connections while maintaining installation simplicity through modular assembly.
Solution Approach 2:
The patent combines the structural support function and the ceiling grid function into an integrated system where main runners serve both as structural elements and as the primary support for the ceiling grid. This merging eliminates the need for separate heavy structural supports while maintaining both strength and simplicity.
2Reliability
If additional overhead structural supports are added to withstand seismic loads, then seismic resistance improves, but the complexity and cost of the ceiling system increases
Solution Approach 1:
The main runners are designed to perform multiple functions: they provide structural support for the ceiling grid, serve as attachment points for cross-tees, and act as the primary load-bearing elements for seismic forces. This multi-functionality eliminates the need for additional dedicated structural supports.
Solution Approach 2:
The patent changes the structural parameters of the main runners by using larger dimensions and heavier gauge materials specifically engineered to withstand seismic loads. This allows the runners themselves to bear the seismic forces without requiring additional overhead supports.
3Strength
If the ceiling system is designed to support heavy equipment and walkable decking, then load capacity increases, but the structural complexity and installation difficulty increase
Solution Approach 1:
The main runners and cross-tees are pre-engineered with standardized connection points and mechanical fastening systems that simplify installation. The modular design allows workers to assemble the heavy-duty ceiling system without requiring complex field modifications or specialized installation procedures.
Data Source
AI summary
A structural grid support system adapted for transferring seismic loads to the vertical structural supports of a modular structure. The system includes larger and longer high load capacity main runners with mechanically fastened cross tees, which transfer seismic forces without failing. The structural grid can provide a diaphragm using mechanically fastened connections in a single horizontal plane without requiring additional overhead support from the roof deck, or requiring fewer such supports. The main runners may include additional connecting elements disposed within the usable space beneath the runner (e.g., ventral threaded receivers) for attaching deployment-specific equipment or hardware, such as network cable trays.