Variable Depth Floor Slabs for Parking Garage

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Title: Variable Depth Floor Slabs for Parking Garage

Author(s): E. Vernon Konkel and Nicholas V. Tsiouvaras

Publication: Journal Proceedings

Volume: 65

Issue: 11

Appears on pages(s): 919-928

Keywords: concrete construction;concrete slabs;durablity;hyperbolic paraboloids;parking garages;permeablity;post-tensioning;prestressed concrete;prestressing steel; structural analysis;structural design.

Date: 11/1/1968

Abstract:
Describes the analysis, design, and construction of the variable depth floor slabs of the parking garage for the Chase Stone Center -Colorado Springs, Colo. Column centers are 30 ft each way and columns are structural steel. A typical slab is cast in place 24 in. deep at the columns and 7 in. at the center lines of the square panels. The undersurface of the slab is a hyperbolic paraboloid with sections parallel to the center lines as straight lines in both directions which results in a "hypar slab." This system is easy to form and results in several other economies that make the system desirable for structures of this type. The elastic frame method was used for both the applied loads and for the effect of the prestressing forces. Calculations are described in detail.