University of Illinois Urbana-Champaign

MDOF Response of Low-Rise Buildings

Kim, Sang-Cheol; White, Donald W.

Content Files
ST5_Final_Report_Nov03.pdf
user significance statement.pdf

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https://hdl.handle.net/2142/9184

Description

Title
MDOF Response of Low-Rise Buildings
Author(s)
  • Kim, Sang-Cheol
  • White, Donald W.
Issue Date
2003-11-04
Keyword(s)
  • Mid-America Earthquake (MAE) Center
  • MDOF
  • Low-Rise Buildings
Date of Ingest
2008-12-02T19:45:32Z
Abstract
In current practice, many approaches for building structural analysis focus on two-dimensional and/or linear elastic idealizations of the response. Nevertheless, the earthquake behavior of low-rise shear wall buildings with non-rigid diaphragms can be highly three-dimensional, and the performance of these systems can depend significantly on the inelastic response of their components. Key modes of response may include both in-plane and out-of-plane wall deformations, and combined diaphragm flexural deformations in two principal directions with diaphragm shear raking displacements. The diaphragm flexibility can significantly influence the out-of-plane wall displacements. The distribution of lateral loads to the structural walls and the degree of torsional coupling between the wall systems can be strongly dependent on the flexibility of the diaphragms and the inelastic system behavior. This research investigates the seismic assessment of shear wall buildings with non-rigid diaphragms. The focus of this work includes the creation and investigation of a simplified multiple degree-of-freedom (MDOF) linear or nonlinear three-dimensional analysis approach that accounts for diaphragm flexibility in buildings of rectangular plan geometry. The number of degrees-of-freedom in the simplified analysis approach is kept as small as possible while still permitting capture of the three-dimensional effects mentioned above. A computer graphics system is developed for visualizing the physical three-dimensional behavior predicted by the simplified MDOF models.The above analysis tools are applied to a two-story historic unreinforced masonry building from which earthquake field data is available, and to a half-scale one-story reinforced masonry building that has been subjected to shaking table tests in prior research. These studies focus on defining appropriate structural properties for accurate prediction of the dynamic responses using the proposed simplified MDOF procedure. This research concludes with the investigation of a simplified linear static methodology applicable for flexible diaphragm structures. The advantages and limitations of this methodology are assessed by comparison of its predictions to experimental and time history analysis results.
Series/Report Name or Number
Mid-America Earthquake Center CD Release 03-04
Type of Resource
text
Language
en
Permalink
http://hdl.handle.net/2142/9184
Sponsor(s)/Grant Number(s)
National Science Foundation EEC-9701785

Owning Collections

Research and Publications - Mid-America Earthquake Center PRIMARY