Files in this item
Files | Description | Format |
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application/pdf ![]() | Structural Research Series 627 |
Description
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 |
Type: | Text |
Language: | English |
URI: | http://hdl.handle.net/2142/14243 |
Sponsor: | U.S. Army. Department of Civil and Mechanical Engineering; U.S. Military Academy. |
Date Available in IDEALS: | 2009-11-16 |