Personal Computer (pc) Aided Design of Post-Tensioned Slabs on Expanding and Compressible Soils

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Title: Personal Computer (pc) Aided Design of Post-Tensioned Slabs on Expanding and Compressible Soils

Author(s): R. Mician

Publication: Special Publication

Volume: 111

Issue:

Appears on pages(s): 99-114

Keywords: computer programs; concrete slabs; deformation; economics; failure; foundations; microcomputers; post-tensioning; soil structure; structural analysis; structural design; General

Date: 12/1/1988

Abstract:
Reinforced and later post-tensioned slabs as foundations for residential and light commercial building were introduced in the 1950s. Low-cost and easy to build, they were constructed at an average rate of 1.5 million per year. In 1976, PTI (Post-Tensioning Institute) initiated research at Texas A & M University to improve the design method. The results were published in 1980. Responding to the complexity of required calculation, part of the climate-soil-structure modeling was calculated by computer and tabulated for quick use. Even so, the method requires computer-aided design, illustrated by the analysis of the failed slab. The printout indicates all weak points of the slab and the probable cause of failure. A structurally sound redesigned slab is calculated next. The printout shows all parameters in limits prescribed by the code. Minimal increase in initial cost can save thousands of dollars in repairs.