Static and Dynamic Loading Tests on Two Small Three-Dimensional Multistory Reinforced Concrete Frames


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Title: Static and Dynamic Loading Tests on Two Small Three-Dimensional Multistory Reinforced Concrete Frames

Author(s): Grant K. Wilby, Robert Park, and Athol J. Carr

Publication: Special Publication

Volume: 73


Appears on pages(s): 35-64

Keywords: beams (supports); columns (supports); cracking (frac-ductility; dynamic loads; dynamic response; dynamic tests; frames; models; reinforced concrete; static loads; strength; -- -- structural design.

Date: 3/1/1982

Two identical small scale six storey three dimensional reinforced concrete framed structures were constructed consisting of columns, beams and floor slabs. Each structure had a single bay in each direction and was approximately one fifth of full size. All members were designed for ductility according to the seismic design requirements of ACI 318-71, One structure was subjected primarily to static lateral loading and the other structure was subjected primarily to dynamic loading on a shaking table. The lateral load strength of the statically loaded structure was accurately predicted when the actual properties of the structure were taken into account. Severe stiffness degradation occurred during cyclic loading in the inelastic range. The displacement response of the dynamically loaded structure was compared with the displacement response predicted by a dynamic frame analysis computer program and the accuracy of the predicted response was found to be extraordinarily dependent on the stiffness and-damping. The tests revealed that under lateral loading significant torsion is induced into the beams at right angles to the direction of loading and this may lead to severe torsional cracking of those beams and a consequent decrease in stiffness and strength of the framed structure.