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Effects of Torsion on the Linear and Nonlinear Seismic Response of Structures.
Sedarat, H.; Bertero, V. V.
National Science Foundation, Washington, DC., September 1990, 344 p.
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The results of linear-elastic static and dynamic analyses of a seven-story reinforced concrete frame-wall structure are presented and the importance of factors such as static lateral load profiles, static eccentricity ratio, and accidental eccentricity on the lateral-torsional response of structures is discussed in the report. A discussion about mathematical modeling of structures for nonlinear analyses is presented. The computer program FACTS and its nonlinear three-dimensional reinforced concrete beam column element are employed in the research. Nonlinear static responses of the seven-story structure to two sets of monotonically increasing lateral loads, with triangular and uniform profiles, are studied. A realistic model of a seven-story structure, that represents typical frame-wall systems, is developed. The importance of such parameters as non-uniform distribution of mass, unsymmetrical distribution of yielding strength in the plan of the structure, and intensity of earthquake ground motion on the seismic response of a building is discussed in detail.
Dynamic response; Dynamic structural analysis; Building codes; Earthquake engineering; Structural vibration; Reinforced concrete; Shear properties; Torsion; Earth movements; Structural members; Linear systems; FACTS computer program; Concrete structures; Mathematical models; Bending moments; Seismic waves