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International Concrete Abstracts Portal

Showing 1-5 of 19 Abstracts search results

Document: 

SP205-16

Date: 

January 1, 2002

Author(s):

B. Spencer and P. B. Shing

Publication:

Symposium Papers

Volume:

205

Abstract:

A stress hybrid element that incorporates an internal displacement dis-continuity is presented for the modeling of concrete fracture. This stress hybrid formulation is superior to similar stiffness-based embedded crack formulations in that it explicitly accounts for boundary tractions so that the equilibrium of the traction fields at the element boundary and the internal crack interface can be enforced in a consistent manner. As a consequence, it also allows for the modeling of crack initiation in an accurate and consistent manner. Numerical examples are provided to compare the performance of the new element to that of a smeared crack model and to demonstrate its superiority in capturing the sliding shear behavior of fractured concrete. The element achieves the realism of the discrete crack approach without the need for remeshing or knowing the location and orientation of a crack a priori.

DOI:

10.14359/11646


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


Document: 

SP205-17

Date: 

January 1, 2002

Author(s):

C. Meyer

Publication:

Symposium Papers

Volume:

205

Abstract:

When designing concrete structures, fatigue related problems are not among the first that come to mind. However, structures subjected to strong cyclic loads such as those associated with destructive earthquakes experience strength and stiffness degradation that are most aptly described as a low-cycle fatigue phenomenon and are related to the damage accumulated under such loading. This paper briefly discusses the various elements of a rational, i.e. mechanics-based design methodology. Results of an experimental test program are summarized, in which 4-inch cubes with or without fiber reinforcement are subjected to uni- and biaxial cyclic compression until failure. The review concludes with a brief review of the various aspects of material behavior that need to be modeled, if the response of reinforced concrete members is to be simulated numerically.

DOI:

10.14359/11647


Document: 

SP205-14

Date: 

January 1, 2002

Author(s):

H. Nakamura and T. Higai

Publication:

Symposium Papers

Volume:

205

Abstract:

The buckling of reinforcing bars is investigated analytically and several indices which characterize the buckling behavior are introduced based on the analytical results. In this paper, buckling analysis of the reinforcing bars is performed by the finite element method using large deflection theory of layered beam elements. The buckling behavior is considered under monotonic and cyclic loading. Based on the analytical results, several indices such as the buckling stress, the residual stress and the buckling mode are used to characterize the buckling behavior. Considering these results, a stress-average strain relationship of the reinforcing bars is developed accounting for inelastic buckling. The model features a post-buckling softening branch, since the buckling behavior is considered in the form of a material property, which is an easy method to introduce the effect of buckling in the finite element method.

DOI:

10.14359/11644


Document: 

SP205-09

Date: 

January 1, 2002

Author(s):

N. Shirai, K. Moriizumi, and K. Terasawa

Publication:

Symposium Papers

Volume:

205

Abstract:

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.

DOI:

10.14359/11639


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