International Concrete Abstracts Portal

Showing 1-5 of 14 Abstracts search results

Document: 

SP356_11

Date: 

October 1, 2022

Author(s):

Ahmed G. Bediwy and Ehab F. El-Salakawy

Publication:

Symposium Papers

Volume:

356

Abstract:

Deep beams are common elements in concrete structures such as bridges, water tanks, and parking garages, which are usually exposed to harsh environments. To mitigate corrosion-induced damage in these structures, steel reinforcement is replaced by fiber-reinforced polymers (FRPs). Several attempts have been made during the last decade to introduce empirical models to estimate the shear strength of FRP-reinforced concrete (RC) deep beams. In this study, the applicability of these models to predict the capacity of simply supported deep beams with and without web reinforcement was assessed. Test results of 54 FRP-RC, 24 steel-fiber-reinforced concrete (FRC), and 7 FRP-FRC deep beams were used to evaluate the available models. In addition, a proposed model to predict the shear strength of FRPFRC deep beams was introduced. The model was calibrated against experiments conducted previously by the authors on FRP-FRC deep beams under gravity load. The model could predict the ultimate capacity with a mean experimental-to-predicted value of 1.04 and a standard deviation of 0.14.

DOI:

10.14359/51737270


Document: 

CI4410Gamble

Date: 

October 1, 2022

Author(s):

by William L. Gamble

Publication:

Concrete International

Volume:

44

Issue:

10

Abstract:

The article reviews structural problems with concrete parking structures, including incidents of vehicles going through edge barriers. Recommendations are provided for implementing current requirements on parking barriers to avoid or minimize future incidents.


Document: 

CI4405Suprenant

Date: 

May 1, 2022

Author(s):

Lingfeng (Leo) Zhang, James Klinger, and Bruce A. Suprenant

Publication:

Concrete International

Volume:

44

Issue:

5

Abstract:

Swirl and broom finishes are typically specified for working surfaces of parking structures, parking lots, commercial pavements, or walkways. Unfortunately, the construction documents for many such projects specify unachievable F-numbers for slabs that are also specified to receive textured finishes. The article provides a bibliography of recommendations and requirements for slab F-numbers and finishes published in ACI documents, other industry resources, and sample project specifications, demonstrating that many conflicting requirements can negatively affect contractors charged with producing swirl and broom finishes.


Document: 

CI3809Vaquero

Date: 

September 1, 2016

Author(s):

Sebastián F. Vaquero, Carlos Salvatore, and Héctor Mackern

Publication:

Concrete International

Volume:

38

Issue:

9

Abstract:

This article presents a case study of the design and construction of a pipe rack system in an operating petroleum refinery in Argentina. The rack is composed of stacked precast concrete H-frames and connecting beams. The H-frames act as the transverse load-resisting system and the connecting beams act as the longitudinal load-resisting system. The authors believe that this design can be easily adapted for other types of structures, including mid-rise buildings, parking structures, and piers.


Document: 

SP290-13

Date: 

September 14, 2012

Author(s):

Daniel Cusson and Jim Margeson

Publication:

Symposium Papers

Volume:

290

Abstract:

Highway bridges and parking structures, subject to coupled effects of mechanical loads and corrosion, often show early signs of distress such as concrete cracking and rebar corrosion leading to reduced structural performance and shortened service life. One solution to this problem is to use low-shrinkage low-permeability high-performance concrete (HPC) for bridge decks exposed to de-icing salts and severe loading conditions. A new HPC was formulated to achieve low shrinkage and low permeability, high early-strength, and 28-day compressive strength over 60 MPa (8,700 psi). Its mechanical performance and durability were tested both in the lab and field under severe test conditions, including restrained shrinkage, cycling loading, freezing and thawing cycles, and application of de-icing salts. Models were developed and calibrated to predict structural performance and service life of concrete bridge decks under severe exposure conditions. Prediction models indicate that bridge decks designed with low-shrinkage HPC can achieve a service life up to 100 years. Compared to normal concrete decks, short-t t-to-medium span bridge decks using low-shrinkage HPC could be built at a comparable initial construction cost, but at less than 35% of the life-cycle cost.

DOI:

10.14359/51684182


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