Exoskeleton Grid Framework for Seismic Container Storage
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Solution Overview
Problem
Existing grid framework structures are prone to structural damage during powerful seismic events, such as Type C and Type D earthquakes, due to the loosening of joints and inability to withstand lateral forces, and require extensive bracing that occupies valuable storage space.
Innovation Solution
An earthquake-resistant grid framework structure incorporating an exoskeleton with perimeter bracing and Vierendeel truss assemblies, supported by vertical columns and bracing members, to absorb lateral forces and maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional grid framework structures are used without exoskeleton support, then the structure is simpler and occupies less space, but it is prone to structural damage during powerful seismic events due to loosening of joints and inability to withstand lateral forces
Solution Approach 1:
The bracing system is segmented into multiple independent components including vertical frame columns, bracing members forming Vierendeel truss assemblies, and perimeter bracing elements. This segmentation allows the complex seismic resistance function to be distributed across multiple simpler structural elements that can be independently designed, manufactured, and assembled, thereby improving reliability without overwhelming complexity.
Solution Approach 2:
The invention introduces an exoskeleton dimension around the traditional grid framework, adding a peripheral bracing structure that operates in a different spatial dimension. The Vierendeel truss assemblies extend vertically and perimetrically to create a three-dimensional exoskeletal framework that provides seismic resistance without interfering with the internal storage functionality of the original grid structure.
2Reliability
If extensive bracing is added to withstand lateral forces during seismic events, then structural integrity is improved, but valuable storage space is occupied
Solution Approach 1:
The bracing members are strategically positioned at critical locations where lateral forces are most impactful, specifically at the perimeter and at vertical intervals forming Vierendeel truss assemblies. This localized bracing approach provides maximum seismic resistance where needed while leaving the central storage area completely open and accessible, optimizing the balance between structural integrity and storage capacity.
Solution Approach 2:
The exoskeleton bracing system operates in the peripheral and vertical dimensions, creating a protective framework that does not encroach upon the horizontal storage volume. The Vierendeel truss assemblies utilize vertical space and perimeter locations to provide lateral force resistance while maintaining clear access to the storage bins in the central region.
3Adaptability or versatility
If the grid framework structure is designed to be modular for expansion, then adaptability is improved, but the complexity of ensuring structural integrity during seismic events increases
Solution Approach 1:
The grid framework is divided into modular bay sections that can be independently assembled and expanded. Each module incorporates standardized Vierendeel truss assemblies and exoskeleton bracing elements that can be replicated and connected using standardized interfaces, allowing the structure to be expanded horizontally or vertically while maintaining consistent seismic resistance characteristics across all modules.
Solution Approach 2:
The Vierendeel truss assemblies serve multiple functions simultaneously: they provide lateral force resistance during seismic events, act as vertical supports for the grid framework, and serve as structural connectors between modular sections. This multi-functionality reduces the need for additional specialized components, simplifying the overall structural assembly while enhancing both seismic performance and modular expandability.
Data Source
AI summary
An earthquake restraint grid framework structure includes a grid framework structure for supporting a load handling device operative to move one or more containers in a stack. The grid framework structure includes intersecting grid members arranged to form a grid having plural f substantially rectangular frames in a horizontal plane, each of the substantially rectangular frames constituting a grid cell. The grid is supported by plural upright columns at each of the intersections of grid members to form a plurality of vertical storage locations for containers to be stacked between the upright columns and be guided in a vertical direction through the substantially rectangular frames. An exoskeleton includes plural vertical frame columns braced by at least one bracing member, the grid being further supported by the exoskeleton to form a seismic restraint system (SFRS).