International Concrete Abstracts Portal

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 606 Abstracts search results

Document: 

CI4705NexInsights

Date: 

May 1, 2025

Publication:

Concrete International

Volume:

47

Issue:

5

Abstract:

NEx: An ACI Center of Excellence for Nonmetallic Building Materials held a full-day technical workshop on “Design of GFRP-Reinforced Slabs-on-Ground and Paving” at the ACI Concrete Convention in Toronto, ON, Canada, on March 31, 2025. In addition, NEx hosted an exclusive lunch for members, speakers, and industry leaders to connect.


Document: 

SP365_01

Date: 

March 1, 2025

Author(s):

Graeme J. Milligan, Maria Anna Polak and Cory Zurell

Publication:

Symposium Papers

Volume:

365

Abstract:

Due to the low lateral stiffness of slabs supported on columns alone reinforced concrete flat plates are typically combined with other structural elements, such as shearwalls. In these structures, the slab-column connections are designed to carry gravity loads only, and the shearwalls, which also carry gravity loads, are required to resist the lateral forces. Therefore, the slab-wall connections (SWCs) are essential for the adequate performance of both the gravity and lateral force resisting systems. However, the majority of punching shear research and design provisions have been focused on slab-column connections, even though punching failures around slab-wall connections have been observed experimentally. Empirical testing of slab-wall connections is difficult due to the required specimen size. This paper investigates the punching shear behaviour of interior slab-wall connections subjected to concentric vertical loading, and combined concentric vertical loading and uniaxial unbalanced moment using a plasticity-based nonlinear finite element model (FEM) in Abaqus. The FEM, developed to study the impact of column aspect ratio on punching shear, was calibrated considering seven isolated slab-column specimens. The analysis of isolated slab-wall connections demonstrates that punching failures can occur before one-way shear failures, although the connection capacity is much higher than the expected loads in most structures. Punching shear design methods for interior slab-wall connections subjected to gravity load only, developed from finite element analysis results, are developed and presented in the paper.

DOI:

10.14359/51746680


Document: 

SP365_05

Date: 

March 1, 2025

Author(s):

David Z. Yankelevsky, Yuri S. Karinski, and Vladimir R. Feldgun

Publication:

Symposium Papers

Volume:

365

Abstract:

Punching shear failure of RC flat slab connections cause loss of slab’s supports. The detached slab is falling and impacting the slab below. That problem requires thorough investigation and appropriate design guidelines. This paper presents research results on various aspects of this impact scenario. The analysis is based on an advanced numerical model that has been formulated, and the impact analyses follow the damage evolution in the concrete and reinforcement until complete connections failure of the impacted slab is developed, and a progressive collapse scenario starts. The effects of slab geometry and material properties were examined, and the contribution of special shear reinforcement and integrity rebars were investigated. The potential contribution of added drop panels to enhance slab resistance were examined. The slabs impact effect on the supporting columns has been investigated as well. The suitability of current static loading design-criteria to provide safe design against dynamic/impact punching shear is assessed. It shows that the current static-loading based design standards cannot ensure resilience of flat slab connections to impact loading and therefore cannot prevent a progressive collapse scenario. Analyses results are compared with inspected failure details of a collapsed RC flat slabs parking garage building, and excellent agreement is obtained.

DOI:

10.14359/51746685


Document: 

CI4612PRO

Date: 

December 1, 2024

Author(s):

Phil Diekemper

Publication:

Concrete International

Volume:

46

Issue:

12

Abstract:

Currently, about 50% of all ready mixed concrete in the United States is produced using Type IL cement. However, in comparison to mixtures with Type I/II cement, there is a lack of information concerning constructability with such mixtures. To create a knowledge base, with a grant from the ACI Foundation, the American Society of Concrete Contractors and Giatec Scientific Inc. are collecting design characteristics of well-performing mixtures with Type IL cement for interior, non-air-entrained concrete floor slabs.


Document: 

CI4610Thiel

Date: 

October 1, 2024

Author(s):

Charles C. Thiel Jr. and K. Dirk Bondy

Publication:

Concrete International

Volume:

46

Issue:

10

Abstract:

All new parking structures in California are required to be wired for photovoltaic installations, resulting in conduit requirements that are excessive for some slabs. These conditions can seriously impair the structural load path and create an unanticipated structural hazard. The California State University (CSU) system’s Seismic Review Board developed interim conduit placement requirements for CSU projects.


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