Long-Term Deflections of Two-Way Slabs

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Title: Long-Term Deflections of Two-Way Slabs

Author(s): N. J. Gardner and A. Scanlon

Publication: Concrete International

Volume: 12

Issue: 1

Appears on pages(s): 63-67

Keywords: concrete construction; cracking (fracturing); deflection; flat concrete plates; formwork (construction); loads (forces); shoring; multistory buildings; structural analysis; two-way slabs; Construction

Date: 1/1/1990

Abstract:
Long-term deflections of two-way slab systems are highly sensitive to a number of parameters directly related to the construction process. These include construction loads arising from the shoring and reshoring procedure used, quality of the concrete placed, environmental conditions during curing, creep and shrinkage characteristics of the concrete (particularly at early ages), and placement of reinforcement. Since damage to nonstructural elements depends largely on time-dependent incremental deflections, the time of installation of the nonstructural elements and the detailing of the interface between the structural and nonstructural elements can significantly affect the serviceability of the system.