In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
ACI World Headquarters
38800 Country Club Dr.
Farmington Hills, MI
ACI Middle East Regional Office
Second Floor, Office # 02.01/07
The Offices 02 Building, One Central
Dubai World Trade Center Complex
Phone: +971.4.516.3208 & 3209
Feedback via Email
Home > Publications > 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.
Title: Influence of the positioning of CFRP laminates for improving punching shear capacity of column-to-slab connections
Author(s): Hikmatullah Akhundzada, Ted Donchev, Diana Petkova and Abdul Mahbob Samsoor
Publication: Special Publication
Appears on pages(s): 18.1-18.8
Keywords: Punching shear failure, RC flat slabs, column to slab connection, CFRP laminates, externally bonded, positioning
Abstract:Structural retrofitting of flat slabs is often required mainly due to corrosion of reinforcement, change of use and design errors. Punching shear failure is a common type of failure in flat slabs in the area of connection with the column, which could lead to progressive collapse. The slab-column connection is critical as it exposes to bending moments and significant shear stresses in RC flat slabs. Utilization of FRP attachment as strengthening method for concrete structures is becoming the most popular approach for improving their characteristics. CFRP laminates are already well established structural strengthening material and the further optimisation of their application in case of punching shear strengthening will allow for developing of effective solution for this problem. The research comprises testing of seven small scale reinforced concrete slabs (550x550x75 mm) (21.7x21.7x3 inch) with a column stud (80x80x75 mm) (3.1x3.1x3 inch) at the centre to simulate the slab-column connection. One control sample and six CFRP strengthened samples were prepared and tested against punching shear failure. The primary variable of the experiment was the positioning, layout and configuration of the CFRP laminates. The total width and thickness of the CFRP laminates were kept constant and the objective was to determine the most efficient layout. It was found out that using CFRP laminates as externally bonded reinforcement significantly enhances the punching shear capacity and results in improved stiffness of the slabs. The result shows a significant increase in ultimate load and stiffness.
Click here to become an online Journal subscriber