Advantages of Using Lightweight Concrete in a Medium Rise Building and Adjoining Post-Tensioned Parking Garage

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Title: Advantages of Using Lightweight Concrete in a Medium Rise Building and Adjoining Post-Tensioned Parking Garage

Author(s): Russell Trumble and Luis Santizo

Publication: Special Publication

Volume: 136

Issue:

Appears on pages(s): 247-254

Keywords: columns (supports); concretes; floors; lightweight concretes; parking facilities; post-tensioning; structural steels; Design

Date: 1/1/1993

Abstract:
Project consists of a 15-story office tower and a 4-level parking structure. The advantages of lightweight concrete over other structural materials for this particular project, and the process followed for its selections, as well as different types of structural systems, are evaluated. The length of spans in both structures was a determining factor in the selection of the floor system. Lightweight concrete, 4000 psi, was chosen for the floors, and 6000-psi normal weight concrete was selected for the columns. As a first step of the design process, economic comparisons were made between concrete and structural steel. After determining that concrete was more economical, alternate floor systems were studied for constructability, function, economy, and availability of materials. Lightweight concrete was preferable for all floor systems, even though a premium cost of nearly 10 dollars per yd 3 is common for this geographic location.