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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 19 Abstracts search results
Document:
SP205-12
Date:
January 1, 2002
Author(s):
T. Tanabe and A. ltoh
Publication:
Symposium Papers
Volume:
205
Abstract:
The shear failure of a reinforced concrete beam and a column without stirrups is known to have substantial scale effect. In other words, softening characteristics of concrete play a dominant role in its pre- and post-peak behavior. The post-peak static behavior of reinforced concrete members are directly related to the dynamic post-peak behavior of reinforced concrete structures or the extent of energy absorbing capacity of a member and consequently to the safety margin to be allocated in a beam or a column in seismic design. It become more so when a structure fail in snap-back instability allowing more energy to come in a structure to be converted to dynamic energy passing the peak loading capacity. The numerical difficulty encountered to capture snap-back is itself a good challenging target. The snap-back instability is explained for the case of uniaxial tension, and the shear characteristics of reinforced concrete beams with snap-back are examined by changing the beam dimensions and the span over depth ratio.
DOI:
10.14359/11642
SP205-08
E. Bentz
The Modified Compression Field Theory (MCFT), developed over the last 20 years at the University of Toronto, is a general method for the analysis of reinforced concrete elements subjected to shear. Implementations of the MCFT range from simple hand techniques in the AASHTO code through computer based sectional analysis methods to nonlinear finite element analysis procedures. In this paper the MCFT is briefly explained and used to calculate the behavior of six University of California, San Diego Columns. The results indicate conservative modeling from the AASHTO code. The sectional model Response-2000 was able to model the behavior of the steel jacketed columns well, but was quite conservative for the columns without jackets. The finite element program TRIX97 did a good job of modeling the behavior of all the columns, though the displacement at failure was underestimated.
10.14359/11638
SP205-09
N. Shirai, K. Moriizumi, and K. Terasawa
The objective of the present study is to examine the performance of the proposed approach in simulating monotonic and cyclic behaviors of shear-dominated RC columns. The macro-element model is formulated on the basis that the total deformation of the RC column can be decomposed into flexural and shear components. The flexural behavior is simulated by the layered element model, and the shear behavior is simulated by the so-called shear element model. The shear element model is a single plane stress RC element which is developed on the basis of the smeared reinforcement and smeared rotating crack concept. Then, the total model is formulated by coupling these two models in series. Three shear-dominated RC column specimens, tested at the University of California at San Diego, are analyzed under monotonic and cyclic loading. It is shown that the proposed model can reproduce the monotonic and cyclic response behavior reasonably well.
10.14359/11639
SP205-10
T.-S. Han, S. 1. Billington, and A. R. lngraffea
Seismic analyses of reinforced concrete structures are performed using the finite element method. A shake table test of a lightly reinforced concrete three story frame building and a shake table test of a seismically designed shear wall are simulated. The effects of modeling boundary conditions and of considering the initial micro-cracking of concrete on natural frequency change are investigated. These parameters are used to calibrate finite element models to experimental models. The simulations predict the overall seismic behavior of reinforced concrete structures. However, the analyses of both structures showed that accuracy of material degradation is lacking and the computational efficiency of such models needs improvement for large-scale seismic analyses.
10.14359/11640
SP205-05
A. ltoh and T. Tanabe
The lattice model provides equivalent continuum formulations for a variety of constitutive equations. In this study, the Compression Field Theory (1) developed by Vecchio and Collins is re-formulated in the form of an equivalent lattice model and developed further for cyclic loading, beyond the scope of the original model. The RC column experiments of UCSD (2) are then analyzed by the method, for which the equivalent lattice model shows acceptable agreement with the experiments. It is noted that shear failure during cyclic loading after yielding of the flexural reinforcement is captured by the method, which is a characteristic feature of this numerical simulation.
10.14359/11635
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