Behavior and Design of Multistory Building Frames of Unbonded Post-Tensioned Concrete

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Title: Behavior and Design of Multistory Building Frames of Unbonded Post-Tensioned Concrete

Author(s): James E. Wailer and John E. Zimmerman

Publication: Journal Proceedings

Volume: 82

Issue: 3

Appears on pages(s): 357-362

Keywords: continuity (structural); flexural strength; frames; post-tensioning;structural design; unbonded prestressing.

Date: 5/1/1985

Abstract:
Designing post-tensioned multistory building frames frequently results in significant construction cost savings. The reluctance of structural engineers, clients, and developers to employ post-tensioning in building designs is often the result of misunderstanding the behavior and design requirements of this type of structure rather than the extra cost entailed in contractor, labor, and material evaluation as compared with other conventional construction methods. This paper illustrates the structural behavior of post-tensioned building frames, presents a moment-balancing design procedure for unbonded, draped, post-tensioned tendons, and discusses several aspects of primary and secondary post-tensioning forces which must be considered to properly design mild steel reinforcement in accordance with ACI 318-77.