Short-Term Deflections of Beams Under Single and Repeated Load Cycles


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Title: Short-Term Deflections of Beams Under Single and Repeated Load Cycles

Author(s): Koladi M. Kripanarayanan and Dan E. Branson

Publication: Journal Proceedings

Volume: 69

Issue: 2

Appears on pages(s): 110-117

Keywords: beams (supports);composite construction (concrete to concrete);cracking (fracturing);cyclic loads;deflection;lightweight aggregate concretes;modulus of elasticity;moments of interia;prestressed concrete;reinforced concrete; research;strength.

Date: 2/1/1972

Presents a simple and efficant design procedure for predicitng the entire short-term load deflection curve (or a single point, such as at maximum load) under repeated load cycles into the cracking range. This includes the loading, recovery, and reloading parts of the load-deflection curve. The "leff concept" adopted by ACI 318-71 for predicting deflections of reinforced beams is extended in this study to both prestressed and reinforced beams under repeated load cycles (including varying load levels) into the cracking range. The reliablity of the procedure is indicated by comparisions between computed results and experimental data of this study for 15 prestressed concrete beams (nine noncomposite and six composite), and with data in the liturature for reinforced concrete beams.