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International Concrete Abstracts Portal

Showing 1-5 of 19 Abstracts search results

Document: 

SP205-13

Date: 

January 1, 2002

Author(s):

L. N. Lowes

Publication:

Symposium Papers

Volume:

205

Abstract:

As a structural material, reinforced concrete requires bond between plain concrete and reinforcing steel. Accurate numerical modeling of structures that exhibit severe bond-stress demand requires explicit representation of bond-zone response. A bond element is presented for use in high-resolution finite element modeling of reinforced concrete structures subjected to general loading. The model is defined by a bond stress versus slip relationship and a relationship between maximum bond strength and the concrete and steel stress-strain state. A finite element implementation of the model is proposed that enables a one-or two-dimensional representation of bond-zone action. Non-local modeling is used to incorporate the dependence of bond strength on the concrete and steel material state. Comparisons of simulated and observed response for systems with uniform and variable bond-zone conditions are presented.

DOI:

10.14359/11643


Document: 

SP205

Date: 

January 1, 2002

Author(s):

Editors: Kaspar William and Tada-aki Tanabe

Publication:

Symposium Papers

Volume:

205

Abstract:

SP-205 Nonlinear finite element analysis (NLFEA) of reinforced concrete is close to being a practical tool for everyday use by design engineers. The first in this collection of 18 papers takes a critical look at the accuracy of this analysis procedure, then identifies and discusses reasons for caution in applying nonlinear analysis methods. Subsequent papers cover topics that include: * Seismic behavior predictions of structures; * Three-dimensional cyclic analysis of compressive diagonal shear failure; * Finite element analysis of shear columns; and * Simulation strategies to predict seismic response of reinforced concrete structures. Designers and researchers who use NLFEA models and procedures for reinforced concrete must be experienced and cautious. The papers in this volume will enable the users to better understand modeling, analysis, and interpretation of results.

DOI:

10.14359/14013


Document: 

SP205-01

Date: 

January 1, 2002

Author(s):

F. J. Vecchio and D. Palermo

Publication:

Symposium Papers

Volume:

205

Abstract:

A critical look is taken at the state-of-the-art in nonlinear finite element analysis of reinforced concrete structures. In examining the results of recent prediction competitions, the accuracy of such analysis procedures is gauged. Reasons for caution when applying nonlinear analysis methods are then identified and discussed. Finally, the results of a test program involving shear critical beams are presented in support of the contention that the behaviour of reinforced concrete is still not well understood. The tests represent a good challenge for validating current procedures.

DOI:

10.14359/11630


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: 

SP205-05

Date: 

January 1, 2002

Author(s):

A. ltoh and T. Tanabe

Publication:

Symposium Papers

Volume:

205

Abstract:

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.

DOI:

10.14359/11635


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