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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.
Showing 1-5 of 13 Abstracts search results
Document:
SP321-03
Date:
September 29, 2017
Author(s):
Dario Coronelli, Francesco Foti, Luca Martinelli, and Elisa Barbarelli
Publication:
Symposium Papers
Volume:
321
Abstract:
The paper reports tests to investigate shear and punching behavior of voided slabs, part of a research aimed at studying the structural response of such systems. The voids are shaped like a truncated pyramid. The program included a series of twelve slabs, divided into four groups according to the transverse steel arrangement. The slabs were loaded by one or two forces and supported on two sides. This loading scheme was chosen to investigate the load transfer and resistant mechanism in the slab with voids, with the aim of studying the shear transfer at a column. Failures under point loads close to the support correspond to those typical in thick slabs. A combination of two failure modes occurred, with punching and diagonal shear tension. The capacity must be predicted using the concrete cross section reduced by the voids.
DOI:
10.14359/51701190
SP321-02
Georgios P. Balomenos, Aikaterini S. Genikomsou, Mahesh D. Pandey, and Maria A. Polak
Four interior reinforced concrete flat slabs are analyzed deterministically using the finite element analysis (FEA) program ABAQUS. Using this verified FEA model, probabilistic FEA is performed considering uncertain material properties. Probabilistic FEA is executed using a new variance based method, namely, multiplicative dimensional reduction method (M-DRM). M-DRM is selected because it overcomes the computational cost limitation, which can be a barrier for these types of analyses; it provides the probability distribution of any structural response, e.g., distribution of punching shear strength; it conducts sensitivity analysis without requiring any further execution of the FEA code. M-DRM is automated in ABAQUS using python programing. First, this study examines how material uncertainty impacts the structural response of interior flat slabs, in terms of ultimate load and ultimate displacement. Then, sensitivity analysis is performed in order to prioritize the most influential input random variables with respect to these structural responses. Finally, probability distribution of the punching shear resistance is also derived, using the design equations from the American code (ACI 318) and Eurocode 2 (EC2), in order to examine the degree of conservatism associated with the current design practices.
10.14359/51701189
SP321-11
Amin Ghali and Ramez B. Gayed
Assemblies of vertical headed stud shear reinforcement are extensively used in practice to resist punching of concrete slabs. Similarly, headed studs making an angle 45 degrees with slab surface can be used for the same purpose. Equations for design and detailing are presented with examples.
10.14359/51701201
SP321-04
Dominik Kueres, Carsten Siburg, Alaa G. Sherif, and Josef Hegger
Over the last 20 years the Institute of Structural Concrete at RWTH Aachen University has conducted numerous punching tests on interior slab-column connections with different types of punching shear reinforcement. Within the tests, different types and arrangements of stirrups, lattice girders, and double-headed studs were used as punching shear reinforcement. In this paper, the efficiency of the various types of punching shear reinforcement is studied and discussed based on the experimental results of 39 tests on interior slab-column connections. By comparing the failure loads with the punching shear capacities without shear reinforcement according to ACI 318-14 and Eurocode 2 along with the German Annex, respectively, the increase in punching shear resistance with each shear reinforcement system is investigated.
10.14359/51701191
SP321-12
David A. Fanella, Mustafa Mahamid, and Michael Mota
Voided concrete flat plate slab systems, which have been used for many years in Europe and other parts of the world, are becoming increasingly popular in the U.S. because of many inherent benefits. This paper presents information on these benefits as well as requirements for serviceability, flexure, and shear. Also included are discussions on vibration and fire resistance.
10.14359/51701202
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