Simple Nonlinear Seismic Analysis of R/C Structures

by Mehdi Saiidi, (A.M.ASCE), Asst. Prof. of Civ. Engrg.; Univ. of Nevada, Reno, Nev. 89557,
Mete A. Sozen, (M.ASCE), Prof. of Civ. Engrg.; Univ. of Illinois at Urbana-Champaign, Urbana, Ill. 61801,

Serial Information: Journal of the Structural Division, 1981, Vol. 107, Issue 5, Pg. 937-953

Document Type: Journal Paper


A simple analytical model is developed for the calculation of the seismic displacement history response of reinforced concrete frame and frame-wall structures. The computer cost for the model is approximately three precent of that for a MDOF system. A structure is idealized as a single-degree system consisting of a mass mounted on a rigid bar connected to the ground by a hinge and a nonlinear rotational spring. The primary force-deformation relationship for the spring is obtained by a static analysis of the multistory structure. To account for stiffness changes during an earthquake, a simple hysteresis model comprising only four rules is developed. The model is examined for eight small-scale ten-story reinforced concrete test structures, and the analytical results are compared with the measured response histories. The model is shown to be successful in most instances.

Subject Headings: Reinforced concrete | Structure reinforcement | Concrete frames | Nonlinear analysis | Seismic tests | Seismic effects | Structural models | History

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