Civil Engineering Association

This report summarizes the results of a research conducted at the University of Colorado, Boulder, aimed at developing a PC-based software tool for performing nonlinear pushover analysis of reinforced concrete buildings. The program links two libraries to an existing finite element program, FEAP, developed at the University of California, Berkeley. The two
libraries are a) a frame element library (which includes beam, beam-column and shear wall elements); and b) a library of uniaxial material laws. The project first modified the existing program to perform nonlinear pushover analyses on a routine basis. Current seismic code suggested procedures for nonlinear pushover analyses were then reviewed. The applicability of nonlinear pushover analyses to the seismic design of reinforced concrete frames was evaluated by studying the response of frames of different heights. The responses of static and dynamic nonlinear analyses on the same buildings were compared. A new shear element was then introduced and a typical shear wall of a utility core was analyzed with a push-over analysis. Details on the features added to program FEAP and on the new commands are documented in the appendices.

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A REPORT

Description:

This report summarizes the results of a research conducted at the University of Colorado,
Boulder, aimed at developing a PC-based software tool for performing nonlinear pushover
analysis of reinforced concrete buildings. The program links two libraries to an existing finite
element program, FEAP, developed at the University of California, Berkeley. The two
libraries are a) a frame element library (which includes beam, beam-column and shear wall
elements); and b) a library of uniaxial material laws. The project first modified the existing
program to perform nonlinear pushover analyses on a routine basis. Current seismic code
suggested procedures for nonlinear pushover analyses were then reviewed. The applicability
of nonlinear pushover analyses to the seismic design of reinforced concrete frames was
evaluated by studying the response of frames of different heights. The responses of static and
dynamic nonlinear analyses on the same buildings were compared. A new shear element was
then introduced and a typical shear wall of a utility core was analyzed with a push-over
analysis. Details on the features added to program FEAP and on the new commands are
documented in the appendices.

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NONLINEAR PUSHOVER ANALYSIS OF REINFORCED CONCRETE STRUCTURES

PRINCIPAL INVESTIGATOR:

ENRICO SPACONE, Ph.D.
ASSISTANT PROFESSOR
University of Colorado, Boulder

GRADUATE STUDENT:

RUSSEL MARTINO, Ms
University of Colorado, Boulder

COLLABORATING COMPANY:

GREG KINGSLEY, Ph.D., P.E.
KL&A of Colorado Golden, Colorado

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