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Analytical and Experimental Investigation of a Polycarbonate Raised Floor System

Outline. Description of StructureObjectivesPreliminary Model

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Analytical and Experimental Investigation of a Polycarbonate Raised Floor System

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    1. Analytical and Experimental Investigation of a Polycarbonate Raised Floor System Kenneth M. (Mac) Will, Ph.D. Larry Daniels, P.E. Larry Kahn, Ph.D., P.E. Fred Meyer Adam Slapkus

    2. Outline Description of Structure Objectives Preliminary Model & Results Revised Models & Results Experiment & Results Conclusions GTSTRUDL Features that Proved Useful & New Features Needed to Improve Productivity

    3. Description of Structure Raised floor in a military facility Electrical and ???? under floor Located in a high bay area Panel descriptions 9 inch x 9 inch x 2.625 inch high polycarbonate pedestal panels Carpet panel on top of four panels but no connection between the panels Panels have ribs, stiffeners, and tubular legs Sample will be passed around

    4. Objectives A lift vehicle was needed in high bay area in order to perform maintenance in ceiling (approximate 40 feet above floor) Could vehicle be placed on raised floor? If so, are there any restrictions on vehicle?

    5. Manufacturer’s Data on Panel Concentrated load performance 600 lbs can be applied to any 1 inch square area Uniform load 75,000 lbs applied uniformly over entire panel Ultimate load 2,000 lbs on any 1 inch square area without failure

    6. Preliminary Model Simple model with smeared thickness for the ribs revealed that deflections were excessive. Was the model accurate? Was the manufacturer’s data in error? Decision was made to more accurately model the panel.

    7. Refined model Model one-quarter of model assuming symmetric BC on edges and 600 lb load applied over 1 inch square area at center of panel. Material properties for the polycarbonate were not available from the manufacturer so values were obtained another source: E 334,000 psi Poisson’s ratio 0.38

    8. Refined model (quarter panel) Assumed boundary conditions at base of legs Two different sets of boundary conditions were used at the base of the leg(s) in order to “bracket” the results Assume the base of the legs completely restrained against vertical and horizontal translations (pinned). Assume the base of the legs completely restrained vertically but allowed to move horizontally. Note: the symmetric BC’s prevented instabilities.

    9. Refined model (quarter panel) SBHQ6 and SBHT6 elements used 1924 joints 1935 elements Mesh shown on next slides

    10. Quarter panel model

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