NEHRP Clearinghouse

Title
Analytical Study of Irregular R/C Structures Subjected to In-Plane Earthquake Loads.
File
PB83100404.pdf
Author(s)
Saiidi, M.; Hodson, K. E.
Source
National Science Foundation, Washington, DC., May 1982, 163 p.
Identifying Number(s)
COLLEGE OF ENGINEERING-59
Abstract
A new version of a simple, single-degree model, the Q-model, is used for approximate displacement response history calculation of irregular planar reinforced concrete frames subjected to earthquakes. Nonlinearity of the response is accounted for at an idealized base sprung with a set of simple hysteresis rules and a full-scale hypothetical frame. The model is used to study the effect of several parameters on the seismic response. Effects of different earthquakes with the same spectral intensities (SI) on two structures are described. It is shown that neither SI nor peak acceleration is adequate to signify the expected structural response. The effect of different wall cutoff points is studied and walls only a few stories high are found to provide sufficient resistance against excessive story drifts. Influence of wall stiffness on the displacement response is demonstrated. Results indicate that an optimal wall stiffness can be obtained, minimizing displacements and story drifts.
Keywords
Dynamic response; Ground motion; Buildings; Earthquake engineering; Earthquake resistant structures; Mechanical hysteresis; Earthquakes; Structural design; Reinforced concrete; Walls; Concrete structures; Dynamic structural analysis