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Punching shear resistance and deformation capacity of fiber reinforced concrete slab-column connections subjected to monotonic and reversed cyclic displacements

Author(s): M-Y. Cheng, G.J. Parra-Montesinos
Paper category: Workshop
Book title: Fifth International RILEM Workshop on High Performance Fiber Reinforced Cement Composites (HPFRCC5)
Editor(s): H.W. Reinhardt, A.E. Naaman
ISBN: 978-2-35158-046-2
Pages: 489 - 496
Total Pages: 8
Language: English

The use of fiber reinforced concrete (FRC) as a means to increase punching shear resistance in slab-column connections subjected to either gravity-type loading or combined gravity and earthquake-induced loads was experimentally investigated. The testing program was two fold. First, ten slab-column connections were tested monotonically to failure to evaluate the ability of various steel fiber reinforced concretes to increase punching shear resistance under gravity-type loading. These tests also allowed the selection of the best materials for use in the second testing phase, which consisted of the testing of two slabcolumn subassemblies subjected to gravity punching shear stresses of 0.17-0.2 √ f c’(MPa) combined with lateral displacement reversals. Two types of hooked steel (Dramix) fibers and one type of twisted (Helix) fiber were evaluated. The hooked steel fibers had an aspect ratio of 55 and 80, and were made of regular strength wire (fu = 1100 MPa) and high-strength wire (fu = 2300 MPa), respectively. The twisted steel fibers had an aspect ratio of 60 and were made of high strength wire. Strain-hardening or high-performance tensile behavior was observed in the FRC with high-strength hooked fibers.
Test results showed that FRCs reinforced with a 1.5% volume fraction of hooked steel fibers (either regular or high strength) offered the best results in terms of punching shear strength and ductility under monotonic loading and thus, they were selected for further investigation under displacement reversals. The two FRC slab-column connections subjected to combined gravity and lateral loading showed excellent behavior with drift capacity of at least 4%. The connection that featured a 1.5% volume fraction of high-strength hooked fibers (high-performance FRC material) could not be failed and showed only minor damage at 5% drift.

Online publication: 2014
Publication Type: full_text
Public price (Euros): 0.00

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