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International Concrete Abstracts Portal

The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

Showing 1-5 of 29 Abstracts search results

Document: 

SP238-12

Date: 

October 1, 2006

Author(s):

C.D. Zhou and X.L. Lu

Publication:

Symposium Papers

Volume:

238

Abstract:

A two-stage analytical model for evaluating the stress-strain behavior of square concrete columns confined with glass fiber-reinforced polymer (GFRP) is proposed. Fifty-one square columns (divided into seventeen groups) were tested under static axial compression up to failure. The main factors considered in the test are as follows: grades of concrete, bonding shape, amounts of GFRP jackets, and space of fiber strips. The results clearly showed the efficiency of the GFRP jackets in enhancing the ultimate strain and the strength of the columns. The analytical model was calibrated using data from the tests, and good agreement between test and computation results was obtained.

DOI:

10.14359/18272

Document: 

SP238-13

Date: 

October 1, 2006

Author(s):

J. Li and J.-Y. Wu

Publication:

Symposium Papers

Volume:

238

Abstract:

In this paper, a continuum damage mechanics (CDM) based constitutive model appropriate for confined concrete is presented. Basically, the tensile and shear damage variables are adopted to describe the degrading of macro-mechanical properties of concrete, and the corresponding damage criteria are established based on elastoplastic damage energy release rates, which can predict the enhancement of strength and ductility of concrete under biaxial compression. To describe the compressive consolidation mechanism under triaxial compressive confinement, the above Drucker-Prager type shear damage criterion is modified to take the third invariant of effective stress into account. The irreversible plastic strains are determined empirically in this paper, though the effective stress space plasticity method is also introduced here. Comparing to experimental tests of concrete under biaxial and triaxial compressive stress states, the predictive results of proposed model show good agreement with test data, which validate the capability of present model for reproducing the nonlinearity of confined concrete.

DOI:

10.14359/18273

Document: 

SP238-14

Date: 

October 1, 2006

Author(s):

W.-F. Chen and Y.-M. Lan

Publication:

Symposium Papers

Volume:

238

Abstract:

Recent worldwide applications of fiber reinforced polymers (FRP) wraps and tubes for existing and new structural members have continued to emphasize the significance of confined concrete. This study presents an overview of the related finite element (FE) studies for, but not limited to, the FRP-confined concrete applications of commercial FE programs such as ABAQUS and ANSYS. The capabilities, limitations, and remarks of the concrete models available in the programs are addressed. When the built-in options cannot be satisfied, several recommendations are also given for the user-defined concrete material models. The needs for future research and developments are also indicated.

DOI:

10.14359/18274

Document: 

SP238-15

Date: 

October 1, 2006

Author(s):

T.-H. Tan and X. Sun

Publication:

Symposium Papers

Volume:

238

Abstract:

This paper presents an experimental investigation to determine the ultimate strength of concrete under triaxial compression. Concrete of 4 different strength levels were employed and triaxal tests were performed on 100 x 300 mm cylindrical specimens to establish the failure criteria for low, normal and high-strength concrete. The effects of confining pressure and stress path on different grades of concrete were also studied and test results were used to verify the failure criteria proposed by other researchers.

DOI:

10.14359/18275

Document: 

SP238-09

Date: 

October 1, 2006

Author(s):

B. Oh and R. Sause

Publication:

Symposium Papers

Volume:

238

Abstract:

Theoretically sound empirical models for the axial stress-strain behavior as well as the transverse deformation behavior of concrete with constant confinement under uniaxial compression loading are proposed based on plasticity theory using existing empirical models and test data in the literature. The proposed axial stress-strain model provides strength and ductility increases with increasing confining pressure. The confining pressure is applied in the model as an initial hydrostatic compression loading region. The proposed empirical transverse deformation model uses the plastic strain rate as a function of the axial strain to provide a basis for quantifying the compaction and dilation behavior of confined concrete under uniaxial loading conditions. Concretes with various compressive strengths are considered in combination with confining pressures up to 50% of the unconfined concrete strength. Parameters needed to describe the axial and transverse deformation behaviors are identified and their recommended values are provided.

DOI:

10.14359/18269

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