Punching shear in concrete reinforced flat slabs with steel fibers and shear reinforcement

Abstract

Steel fibers in reinforced concrete increase the performance of slab-column connection once they increase ductility and energy absorption capacity of the concrete. The use of fibers in flat slabs may increase strength and change the mode of failure. The objective of this work is to present an experimental evaluation of punching shear strength of reinforced concrete flat slab with steel fibers and punching shear reinforcement. Eight square slabs, size 1800 mm by 1800 mm by 130mm, were loaded until failure by punching shear around the column. The models were divided in two groups, depending on the type of the concrete used (with or without steel fibers). The steel fiber volume used in the slabs of second group was of 0.9%. Each group was composed of four slabs: one without shear reinforcement and three with shear reinforcement (studs) distributed radially around the column. The use of steel fibers increased the ultimate strength of all flat slabs. In one of the slabs, the association of steel fibers with shear reinforcement changed the failure surface from outside to inside the punching shear reinforcement region.

Punching Shear Behavior of Flat Slab Strengthen with Y-Type Perfobond Shear

“…Two concrete mixes were used in this test; the first was without steel fiber, and the second was with steel fiber. In the second mixture, the percentage of steel fibers used was 1% (ratio from steel's density equal to 7850 Kg/m3), as an approximate average of values adopted in several previous studies [13,14,27].…”

Modificação de fibras naturais e suas aplicações em materiais poliméricos - uma revisão bibliográfica

“…O crescimento do mercado de compósitos baseados em fibras naturais pode ser observado em diversas áreas. Algumas publicações destacam seu uso nas indústrias: automotiva, construção 7,4 , asfalto 2 entre outros. Seguindo as tendências atuais, há a expectativa que estes materiais possam ser utilizados em outras áreas.…”

Durchstanztragverhalten stahlfaserverstärkter Flachdecken mit Durchstanzbewehrung

“…Im Gegensatz zu der umfassenden Datenbasis an Versuchen mit stahlfaserverstärkten Flachdecken ohne Durchstanzbewehrung liegen bisher kaum systematische Untersuchungen mit Durchstanzbewehrung vor (vgl. [1,[11][12][13]). In der nationalen und internationalen Literatur konnten hierzu von den Autoren lediglich zwölf Versuche erfasst werden.…”

“…In der nationalen und internationalen Literatur konnten hierzu von den Autoren lediglich zwölf Versuche erfasst werden. Diese Versuche zeigten entweder ein Biegeversagen [1] oder verwendeten für Deutschland untypische Durchstanzbewehrungsformen [11][12][13]. Bislang…”

“…In der nationalen und internationalen Literatur konnten hierzu von den Autoren lediglich zwölf Versuche erfasst werden. Diese Versuche zeigten entweder ein Biegeversagen [1] oder verwendeten für Deutschland untypische Durchstanzbewehrungsformen [11–13]. Bislang erlaubten diese Punkte daher keine umfassende Aussage zur Wirksamkeit von Stahlfaserbeton mit Durchstanzbewehrung in Bezug auf Tragfähigkeit, Sicherheit und Wirtschaftlichkeit.…”