Behavior of Concrete Bridges Reinforced with High-Performance Steel Reinforcing Bars
Behavior of Concrete Bridges Reinforced with High-Performance Steel Reinforcing Bars

Author:

Publisher:

Published: 2004

Total Pages:

ISBN-13:

DOWNLOAD EBOOK

High-performance (HP) steel reinforcing bars are characterized by their high tensile strength and enhanced corrosion resistance in comparison to conventional ASTM A 615 Grade 60 steel. Use of HP steel in concrete bridges could lead to potential savings by reducing the amount of steel required based on its higher strength characteristics and expanding the service life of bridges due to its enhanced corrosion resistance. A commercially available steel know Micro-Composite Multi-Structural Formable (MMFX) steel which is conforming to ASTM A 1035, was selected for this study because of its high tensile strength and enhanced corrosion resistance. Comprehensive experimental and analytical programs were carried out to evaluate the mechanical properties of the HP steel bars, its bond characteristics, and the behavior of concrete bridge decks reinforced with HP steel. Research findings showed that HP steel used in this study exhibited much higher tensile strength than that of conventional Grade 60. In addition, the HP steel bars had much lower corrosion rate than Grade 60 bars. Bending HP steel bars reduce its ultimate strength and strain by 6 and 70 percent, respectively. However, when HP steel bent bars are bonded to concrete they develop their full stress-strain capacity. Bond test results indicated that a stress level up to 90 ksi can be developed in #8 HP steel bars without the use of transverse reinforcement. The use of transverse reinforcement increases the bond strength of HP steel reinforcing bars, consequently reaching stress levels in the bars up to 150 ksi. When possible, it is recommended to use a minimum amount of transverse reinforcement to confine spliced bars to ensure ductile behavior and provide warning prior to failure. Direct replacement of Grade 60 with HP steel bars in bridge decks is a conservative approach. However, reducing the amount of HP steel by 33 percent does not impair the ultimate-load carrying capacity or alter the serviceability behavior o.

Behavior of Concrete Bridges Reinforced with High-performance Steel Reinforcing Bars
Behavior of Concrete Bridges Reinforced with High-performance Steel Reinforcing Bars

Author: Hatem Mohamed A. Seliem

Publisher:

Published: 2007

Total Pages: 287

ISBN-13: 9780549077770

DOWNLOAD EBOOK

Research findings showed that HP steel exhibited much higher tensile strength than that of conventional Grade 60. In addition, the HP steel bars had much lower corrosion rate than Grade 60 bars. Bending HP steel bars reduce its ultimate strength and strain by 6 and 70 percent, respectively. However, when HP steel bent bars are bonded to concrete they develop their full stress-strain capacity.

Design of Concrete Structures Using High-strength Steel Reinforcement
Design of Concrete Structures Using High-strength Steel Reinforcement

Author: Bahram M. Shahrooz

Publisher: Transportation Research Board

Published: 2011

Total Pages: 83

ISBN-13: 030915541X

DOWNLOAD EBOOK

TRB's National Cooperative Highway Research Program (NCHRP) Report 679: Design of Concrete Structures Using High-Strength Steel Reinforcement evaluates the existing American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications relevant to the use of high-strength reinforcing steel and other grades of reinforcing steel having no discernible yield plateau. The report also includes recommended language to the AASHTO LRFD Bridge Design Specifications that will permit the use of high-strength reinforcing steel with specified yield strengths not greater than 100 ksi. The Appendixes to NCHRP Report 679 were published online.

Behavior of Concrete Structures Reinforced with High Strength Steel
Behavior of Concrete Structures Reinforced with High Strength Steel

Author: Rahman Sabbar Kareem

Publisher:

Published: 2020

Total Pages: 272

ISBN-13:

DOWNLOAD EBOOK

The structural strength and corrosion resistance of concrete members are improved when A1035 steel is used as the main reinforcement. The enhancement of A1035 is achieved by the modification of the composition and microstructure of the steel. Therefore, the behavior of concrete structures reinforced with high-performance steel (A1035) is different from those reinforced with the regular steel (A615). Concrete bridge decks reinforced with different amounts of A1035 were studied in this research program. The structural behavior of twelve concrete bridge decks reinforced with A615 Grade 420 (60 ksi) and A1035 Grade 830 (120 ksi) steel was investigated at both service and strength limit states. The tensile strain of steel and compressive strain of the concrete were measured in each load step. In addition to measuring the deflection, a microscope was used to measure the maximum crack width during testing. Then, the finite element method was used to model the concrete bridge decks. ABAQUS software was used to represent the model. The concrete material was represented by C3D8 elements, and the steel material was modeled by T3D2 elements. Concrete Damaged Plasticity Model was used to represent the nonlinear behavior of concrete. The plastic behavior of the reinforcing steel was represented by Plasticity option. The final part of the dissertation focuses on investigating the structural behavior of concrete beams reinforced with A1035 and cast with different concrete strengths. The structural behavior of eight reinforced concrete beams was investigated. Two types of reinforcement were used, regular steel (A615) and high-performance steel (A1035). Three different concrete strengths were used, normal, high, and ultra-high strength. The deflection, maximum crack width, compressive strain of concrete, and tensile strain of steel were measured during testing.

Bond Behavior of High Performance Reinforcing Bars for Concrete Structures
Bond Behavior of High Performance Reinforcing Bars for Concrete Structures

Author:

Publisher:

Published: 2004

Total Pages:

ISBN-13:

DOWNLOAD EBOOK

Bond between the concrete and the reinforcing steel is a major factor affecting the performance of reinforced concrete structures. Advances in material science led to the production of High Performance Steel that has enhanced corrosion resistance and higher strength compared to conventional Grade 60 steel. Such material can lead to more economical design reducing the material requirements for a particular project and expanding its life span. The objective of this research is to study the bond behavior of High Performance reinforcing bars for concrete structures and to evaluate the effect of different parameters believed to affect the bond characteristics. Twenty-two large scale reinforced concrete splice beams were constructed using No. 8 and No. 11 reinforcing bars, having different cross-sections with varying concrete compressive strengths and development lengths. The beams were tested using four point bending setup to provide a constant moment region over the splice zone. Test results indicate that stresses up 90 ksi can be achieved in the No. 8 bars and up to 70 ksi in the No. 11 bars without confinement; however, it is recommended to use transverse reinforcement to confine the High Performance bars in order to ensure ductility. These stresses can be evaluated at failure using a simple proposed equation. Test results were used to extend the current ACI Committee 408 equations to better predict the stresses in the High Performance Steel.

Advances in Civil Engineering and Building Materials
Advances in Civil Engineering and Building Materials

Author: Shuenn-Yih Chang

Publisher: CRC Press

Published: 2012-10-31

Total Pages: 974

ISBN-13: 0203388070

DOWNLOAD EBOOK

Advances in Civil Engineering and Building Materials presents the state-of-the-art development in: - Structural Engineering - Road & Bridge Engineering- Geotechnical Engineering- Architecture & Urban Planning- Transportation Engineering- Hydraulic Engineering - Engineering Management- Computational Mechanics- Construction Technology- Buildi