Seismic Rack Base Assembly for Anti-Tip and Lateral Stability
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Solution Overview
Problem
Existing seismically-rated telecommunications equipment racks face challenges in resisting translatory and pivoting movements during seismic events due to increased weight and mass capacities, necessitating stronger structural support.
Innovation Solution
A seismic base structure comprising a base plate, side walls, an anti-tip support bar, and a support beam, which are assembled without jigs and welded together to form a channel for uprights, providing enhanced resistance to translatory and pivoting movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional sheet steel equipment racks are used, then manufacturing simplicity is maintained, but seismic load resistance is insufficient for increased payload weights
Solution Approach 1:
The base structure is divided into separate weldment components (side walls, support beams, anti-tip support bar, base plate) that are assembled and welded together, allowing each component to be optimized for its specific structural function while collectively providing enhanced seismic load resistance
Solution Approach 2:
The base structure uses a composite welded assembly of multiple steel components with different geometries and functions, creating a unified structure that provides superior strength and seismic resistance compared to traditional single-piece sheet steel construction
2Reliability
If the base structure is made more robust to resist translatory and pivoting movements, then seismic stability is improved, but manufacturing complexity increases
Solution Approach 1:
The robust base structure is achieved through segmented components that can be manufactured separately using standard fabrication processes, then assembled and welded together, maintaining manufacturing ease while achieving high seismic stability
Solution Approach 2:
Multiple functional components (side walls for vertical support, support beams for lateral stability, anti-tip support bar for pivoting resistance) are merged into a single welded assembly that provides comprehensive seismic protection while each component remains manufacturable using conventional methods
3Strength
If channel depth is increased to improve upright support, then resistance to translatory movement is enhanced, but base plate area requirements increase
Solution Approach 1:
The channel is formed by combining vertical side walls with horizontal support beams, creating a three-dimensional welded structure that provides deep upright support without requiring a proportionally larger base plate area, as the support is distributed across multiple dimensions and components
Data Source
AI summary
A seismic base for an equipment rack includes a base plate, a first side wall attached to the base plate, a second side wall attached to the base plate, the second side wall being positioned behind the first side wall in a longitudinal direction, an anti-tip support bar extending between the first and second side walls in the longitudinal direction, and a support beam extending in a lateral direction, between the anti-tip support bar and a first lateral wall of the first and second side walls, respectively. The seismic base resists translatory and/or pivoting movements (e.g., of the equipment rack to which the seismic base is attached) in or about, respectively, the longitudinal direction and the lateral direction.