Compressive Membrane Capacity Estimates in Laterally Edge Restrained Reinforced211 Concrete One-Way Slabs

摘要

The load capacity of laterally restrained reinforced concrete one-way slabs is211u001eestimated in compressive membrane theory with the use of a midspan deflection. 211u001eHowever, the midspan deflection estimates exhibit large variability. The point of 211u001epeak thrust leads to a more accurate index of the peak load capacity than midspan 211u001edeflection. The calculation of the thrust within the compressive membrane theory 211u001eis a maximum when the slab's axial shortening and the outward support movement 211u001eare a maximum. The use of the peak thrust to select the peak capacity, when 211u001ecombined with a modification to Park and Gamble's (1980) compressive membrane 211u001etheory, provides an improved overall correlation to the experimental data for a 211u001elarge range of span-to-thickness rations (2.7 < L/h < 28.3). In this study, peak 211u001emidspan deflection estimates were developed to define the peak point of the load-211u001edeflection curve. The slab's axial concrete compressive strength and the peak 211u001econcrete compressive strain are used within a curvature and geometrically based 211u001edeflection equation, to preduct the midspan deflection. The post-peak trough and 211u001eultimate points are related empirically to the tensil membrane curve, and the 211u001egenerated load-deflection curve compares well with the experimental data.