Experiment to Study Earthquake Response of R/c Structures With Stiffness Interruptions
Moehle, Jack Peter
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https://hdl.handle.net/2142/66884
Description
Title
Experiment to Study Earthquake Response of R/c Structures With Stiffness Interruptions
Author(s)
Moehle, Jack Peter
Issue Date
1980
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
The object of the study was to develop improved understanding of the earthquake response of reinforced concrete structures having abrupt interruptions in the lateral-force-resisting elements in adjacent stories. The study comprises both experimental and analytical phases. Experimental work includes earthquake simulation tests of four small-scale, reinforced concrete structures and static tests of small-scale members and member assemblies which were representative of elements composing the test structures. Analytical work includes evaluation of several simple linear and nonlinear numerical models with emphasis on use of readily-available, approximate analysis or design methods.
The small-scale test structures (total height of 2.29 meters) comprised either two nine-story, three-bay frames situated opposite one another and parallel to a single direction of base motion or two frames with a centrally-located prismatic wall. The first story of frames was twice the height of other stories. Wall heights in the four structures varied, having no wall, one-story wall, four-story, or nine-story (full height of frames) wall. Measurements during testing include displacements, accelerations, and forces acting on the walls at each level. This report includes detailed descriptions of the test structures and the method used to proportion the structures, data obtained during testing, and discussion of the various data and interrelations among response measurements.
Descriptions of and results obtained using simple linear and nonlinear numerical models are presented. Comparison of conventional modal-spectral and equivalent-lateral-force design procedures are made. The use of modal-spectral analysis for obtaining estimates of response maxima is also made. Measured dynamic strength of test structures are evaluated relative to conventional limit analysis procedures using measured static strengths of constituent members. Response for a monotonic static loading is evaluated by considering inelastic behavior of members. Nonlinear SDOF models are used to estimate displacement maxima and waveforms. A simple, design-oriented SDOF model is described and evaluated, also.
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