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Title:Compressive Membrane Capacity Estimates in Laterally Edge Restrained Reinforced Concrete One-Way Slabs
Author(s):Welch, R.W.; Hall, W.J.; Gamble, W.L.
Subject(s):Reinforced concrete
Lateral restraint
One-way slabs
Abstract:The load capacity of laterally restrained reinforced concrete one-way slabs is estimated in compressive membrane theory with use of a midspan deflection. However, the midspan deflection estimates exhibit large variability. The point of peak thrust leads to a more accurate index of the peak load capacity than midspan deflection. The calculation of the thrust within the compressive membrane theory is a maximum when the slab's axial shortening and the outward support movement are a maximum. The use of the peak thrust to select the peak capacity, when combined with a modification to Park and Gamble's (1980) compressive membrane theory, provides an improved overall correlation to the experimental data for a large range of span-to-thickness ratios (2.7 < Lih <28.3). In this study, peak midspan deflection estimates were developed to define the peak point of the load-deflection curve. The slab's axial concrete compressive strength and the peak concrete compressive strain are used within a curvature and geometrically based deflection equation, to predict the midspan deflection. The post-peak trough and ultimate points are related empirically to the tensile membrane curve, and the generated load-deflection curve compares well with the experimental data. A simple compressive membrane load capacity estimate for laterally restrained reinforced concrete one-way slabs is developed for field use. The estimate uses the axial force-moment interaction equations and a ratio for the peak thrust to the slab's axial capacity, and results in an accurate estimate of the peak compressive membrane capacity using yield line theory.
Issue Date:1999-05
Publisher:University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Civil Engineering Studies SRS-627
Genre:Technical Report
Sponsor:U.S. Army.
Department of Civil and Mechanical Engineering; U.S. Military Academy.
Date Available in IDEALS:2009-11-16

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