International Concrete Abstracts Portal

International Concrete Abstracts Portal

Showing 1-5 of 9 Abstracts search results

Document: 

12-234

Date: 

May 1, 2015

Author(s):

Martin Bimschas, Eleni Chatzi, and Peter Marti

Publication:

Structural Journal

Volume:

112

Issue:

3

Abstract:

In this paper, a theoretical concept is presented for the inelastic flexural deformation analysis of reinforced concrete bridge piers. The influence of shear-related inclined cracking on the flexural deformation behavior is taken into account using discontinuous stress fields for the determination of the chord forces. The goal is the development of a reliable mechanical model being able to describe the complete distribution of flexural deformations along the member and at all loading levels. The influence of various shear-carrying mechanisms on the spread of plasticity is discussed and the required mathematical relationships for a practical application are derived. The presented background gives both qualitative and quantitative insight into the phenomena and parameters influencing the flexural deformation behavior under the influence of shear-related tension shift. While the study focuses on the example of cantilever bridge piers with wall-type cross sections, the same concept can also be applied to more general members.

DOI:

10.14359/51687653


Document: 

12-235

Date: 

May 1, 2015

Author(s):

Martin Bimschas, Eleni Chatzi, and Peter Marti

Publication:

Structural Journal

Volume:

112

Issue:

3

Abstract:

A mechanical approach for the inelastic flexural analysis of reinforced concrete bridge piers, presented in a companion paper, is applied and the results are compared to the experimental measurements from two large-scale tests. The details of the practical application are discussed and, based on the reference behavior from the experiments, the capabilities and limitations of the method are investigated. The approach uses discontinuous stress fields to account for the influence of shear on the flexural behavior and combines it with the tension chord model to include the bond-related interaction between concrete and reinforcement. Both the global and the local load-deformation behaviors are analyzed in the elastic and inelastic range, providing a complete description of the flexural response along the backbone of a cyclic load history.

DOI:

10.14359/51687654


Document: 

108-S68

Date: 

November 1, 2011

Author(s):

Santosh G. Shah, V. Bhasya, and J. M. Chandra Kishen

Publication:

Structural Journal

Volume:

108

Issue:

6

Abstract:

The tension-softening parameters for different concrete-concrete interfaces are determined using the bimaterial cracked hinge model. Beams of different sizes having a jointed interface between two different strengths of concrete are tested under three-point bending (TPB). The load versus crack mouth opening displacement (CMOD) results are used to obtain the stress-crack opening relation through an inverse analysis. In addition, the fracture energy, tensile strength, and modulus of elasticity are also computed from the inverse analysis. The fracture properties are used in the nonlinear fracture mechanics analysis of a concrete patch-repaired beam to determine its load-carrying capacity when repaired with concrete of different strengths.

DOI:

10.14359/51683371


Document: 

D102-S04

Date: 

July 1, 2005

Author(s):

Emil de Souza Sanchez Filho, Marta de Souza Lima Velasco, and Ricardo Amorim Einsfeld

Publication:

Structural Journal

Volume:

102

Issue:

4

Abstract:

Disc. 101-S65/From the September-October 2004 ACI Structural Journal, p. 660 Shear Strengthening of Reinforced Concrete Beams Using Fiber-Reinforced Polymer Sheets with Bonded Anchorage, by Bimal Babu Adhikary, Hiroshi Mutsuyoshi, and Muhammad Ashraf

DOI:

10.14359/14568


Document: 

101-S65

Date: 

September 1, 2004

Author(s):

Bimal Babu Adhikary, Hiroshi Mutsuyoshi, and Muhammad Ashraf

Publication:

Structural Journal

Volume:

101

Issue:

5

Abstract:

This paper presents the results of a study into shear strengthening of reinforced concrete (RC) beams using externally bonded fiber-reinforced polymer (FRP) sheets. The study focused on the effect of extending the length of sheet on the top surface of the beam to delay or prevent sheet debonding. Test variables were the kinds of fibers, the wrapping layouts, and the length of bonded anchorage. From the experiments, it was confirmed that FRP with bonded anchorage is much more effective than the U-wrap scheme. Extending the sheets on a top surface of the beam resulted in a decrease in interface bond stresses and an increase in FRP strain at failure. Four different models for estimating the contribution of FRP sheets to the shear capacity Vf of beams were investigated. Two new equations to calculate Vf are presented: when failure occurs due to sheet debonding and when the beams are provided with bonded anchorage at the top face of beams.

DOI:

10.14359/13388


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