Contribution of concrete and shear reinforcement to the punching shear resistance of flat slabs

2020 ◽  
Vol 203 ◽  
pp. 109872 ◽  
Author(s):  
Philipp Schmidt ◽  
Dominik Kueres ◽  
Josef Hegger
Keyword(s):  
Shear Resistance ◽  
Punching Shear ◽  
Shear Reinforcement ◽  
Flat Slabs

Enhanced reliability assessment of punching shear resistance models for flat slabs without shear reinforcement

2021 ◽  
Vol 226 ◽  
pp. 111319
Author(s):  
Marcus Ricker ◽  
Tânia Feiri ◽  
Konstantin Nille-Hauf ◽  
Viviane Adam ◽  
Josef Hegger
Keyword(s):  
Reliability Assessment ◽  
Shear Resistance ◽  
Punching Shear ◽  
Shear Reinforcement ◽  
Flat Slabs

scholarly journals Investigation of the effects of opening size and location on punching shear resistance of flat slabs using Abaqus

2021 ◽  
Vol 15 (4) ◽  
pp. 136-147
Author(s):  
Nguyen Tuan Trung ◽  
Pham Thanh Tung
Keyword(s):  
Experimental Data ◽  
Numerical Model ◽  
Numerical Study ◽  
Shear Resistance ◽  
Design Principles ◽  
Numerical Results ◽  
Punching Shear ◽  
Shear Reinforcement ◽  
Flat Slabs ◽  
Abaqus Model

The paper presents a numerical study on the effects of opening size and location on punching shear resistance of flat slabs without drop panels and shear reinforcement using ABAQUS. The study proposes an ABAQUS model that is enable to predict the punching shear resistance of flat slabs with openings. The model is validated well with the experimental data in literature. Using the validated numerical model, the effects of opening size and location on the punching shear resistance of flat slabs are then investigated, and the numerical results are compared with those predicted by ACI 318-19 and TCVN 5574:2018. The comparison between experimental and numerical results shows that the ABAQUS model is reliable. The punching shear resistances calculated by ACI 318-19 and TCVN 5574:2018 with different opening sizes and locations are agreed well to each other, since the design principles between two codes now are similar.

scholarly journals Theoretical prediction of punching shear capacity of flat slabs without shear reinforcement strengthened by concrete topping

2021 ◽  
Vol 1203 (2) ◽  
pp. 022108
Author(s):  
Daniel Čereš ◽  
Katarína Gajdošová
Keyword(s):  
Shear Resistance ◽  
Design Guidelines ◽  
Shear Capacity ◽  
Reinforcement Ratio ◽  
Punching Shear ◽  
Shear Reinforcement ◽  
Model Code ◽  
Flat Slabs ◽  
Eurocode 2 ◽  
Model Code 2010

Abstract The main reasons for strengthening flat slabs are the change of the use of a building, increase in the value of loads, degradation of the concrete cover layer, or insufficient reinforcement. This paper is focused on the assessment of punching shear capacity of the strengthened flat slabs without shear reinforcement. One of the possibilities how to enhance punching shear capacity is the addition of reinforced concrete topping. The main goal of this paper is to compare the possibilities for calculation of the increase in the punching shear capacity by investigation of the influence of different thicknesses of concrete toppings and different reinforcement ratio. A reference specimen is represented by a fragment of a flat slab with the thickness of h = 200 mm supported by circular column with the diameter of 250 mm. Three different thicknesses (50 mm, 100 mm, 150 mm) of concrete toppings were considered together with three different reinforcement ratios for each thickness of concrete overlay. Theoretical predictions of the punching shear resistance of flat slabs were evaluated by design guidelines according to the relevant standards: Eurocode 2 (EN 1992-1-1), Model Code 2010 and draft of the second generation of Eurocode 2 (prEN 1992-1-1). The differences in the influence of reinforcement ratio are significant. In Model Code 2010 the reinforcement ratio in concrete topping was considered in equation of moment of resistance. This is unlike in both of the mentioned Eurocodes, where the reinforcement ratio was assumed as a geometric average value of the original reinforcement ratio in the slab before strengthening and of the reinforcement ratio of concrete topping. All the predicted theoretical calculations are based on the perfect connection and bond between the original and new layer of concrete. These predictions should be verified by experimental investigation, which is going to be prepared shortly. By the additional increase in the thickness of concrete topping or in the amount of added reinforcement the attention should be payed to the limitation of the punching shear resistance by the value of the maximum punching shear resistance in the compression concrete strut.

Punching shear resistance of flat slabs with different types of stirrup anchorages such as shear reinforcement

2022 ◽  
Vol 253 ◽  
pp. 113671
Author(s):  
Victor Hugo Dalosto de Oliveira ◽  
Henrique Jorge Nery de Lima ◽  
Guilherme Sales Melo
Keyword(s):  
Shear Resistance ◽  
Punching Shear ◽  
Shear Reinforcement ◽  
Flat Slabs ◽  
Different Types

The Maximum Punching Capacity of Flat Slabs

2017 ◽  
Vol 259 ◽  
pp. 232-237
Author(s):  
Lucia Majtánová ◽  
Jaroslav Halvonik ◽  
Ján Hanzel
Keyword(s):  
Experimental Tests ◽  
Shear Resistance ◽  
Punching Shear ◽  
Shear Reinforcement ◽  
Flat Slab ◽  
Flat Slabs ◽  
Punching Failure

Two ways how to determine maximum punching resistance of flat slabs with shear reinforcement are currently used. The first way is verification of the concrete strut capacity at the column periphery defined as VRd,max. The second limit is defined as kmax multiple of the punching shear resistance without shear reinforcement VRd,c. The values of kmax are proposed usually in between 1.4 and 2.0. Results of the experimental tests are presented in the paper that were focused on above mentioned limits, whether failure of the struts can precede any other form of punching failure that is limited by kmax*VRd,c. Two experimental slab samples reinforced with high amount of shear reinforcement that increased punching capacity above capacity of the concrete struts were tested together with two slab samples cast without shear reinforcement. Comparison has shown that punching resistance of flat slab with shear reinforcement has been 1.7 times higher than resistance without shear reinforcement. While some standards allow for use kmax value of 1.9 in this case. This indicates that limits based only on the kmax factors may overestimate actual maximum punching shear resistance.

PREDICTION OF PUNCHING SHEAR RESISTANCE OF PRESTRESSED CONCRETE FLAT SLABS

2011 ◽  
Vol 14 (1) ◽  
pp. 180-196
Author(s):  
A M Elshihy ◽  
H A ShehabEldeen ◽  
O Shaalan ◽  
R S Mahmoud
Keyword(s):  
Prestressed Concrete ◽  
Shear Resistance ◽  
Punching Shear ◽  
Flat Slabs

Activation model for various punching shear reinforcement types in flat slabs and column bases optimized for design

2021 ◽  
Vol 249 ◽  
pp. 113310
Author(s):  
Philipp Schmidt ◽  
Michel Pleim ◽  
Jan Bielak ◽  
Josef Hegger
Keyword(s):  
Punching Shear ◽  
Shear Reinforcement ◽  
Activation Model ◽  
Flat Slabs ◽  
Column Bases

Zur maximalen Durchstanztragfähigkeit von Einzelfundamenten mit einer neuartigen Durchstanzbewehrung/Maximum punching shear resistance of footings with a new punching shear reinforcement

Bauingenieur ◽  
2016 ◽  
Vol 91 (11) ◽  
pp. 435-445
Author(s):  
Josef Hegger ◽  
Alexander Stark ◽  
Marcus Ricker ◽  
Dominik Kueres
Keyword(s):  
Shear Resistance ◽  
Punching Shear ◽  
Shear Reinforcement ◽  
Eine Hohe

Aufgrund der geringeren Schlankheit und der Belastung durch Bodenpressungen stellt sich bei Fundamenten und Bodenplatten ein Lastabtrag ein, der infolge der steileren Druckstrebenneigung höhere Durchstanztragfähigkeiten ermöglicht als bei Flachdecken. Die steileren Schubrisse führen jedoch dazu, dass vertikale Durchstanzbewehrungselemente weniger effizient sind als in Flachdecken. Aus diesem Grund scheinen geneigte Bewehrungselemente geeigneter für den Einsatz in Platten mit größerer Bauteildicke und geringerer Schlankheit. Aufbauend auf den Ergebnissen vorhandener experimenteller Untersuchungen an durchstanzbewehrten Einzelfundamenten wurde daher ein neues Durchstanzbewehrungselement mit geneigten Bewehrungsstäben entwickelt.   In einer ersten Versuchsserie wurden sieben Versuche an Einzelfundamenten mit der neuartigen Durchstanzbewehrung und einem Versagen innerhalb des durchstanzbewehrten Bereichs durchgeführt. Die Versuche wurden in Anlehnung an eine bereits bestehende Versuchsserie an Einzelfundamenten ohne und mit Bügeln als Durchstanzbewehrung geplant und zeigten im Vergleich eine erhebliche Steigerung der Durchstanztragfähigkeit.   Aufbauend auf den Ergebnissen der ersten Versuchsserie wurde eine zweite Versuchsserie durchgeführt, um die maximale Durchstanztragfähigkeit von Fundamenten mit der neuartigen Durchstanzbewehrung zu untersuchen. In den sieben Versuchen wurden die Betondruckfestigkeit, die Schubschlankheit, der bezogene Stützenumfang und die Anordnung der Durchstanzbewehrungselemente variiert. Der Vergleich der Bruchlasten der neu durchgeführten Versuchsserie mit der Durchstanztragfähigkeit nach DIN EN 1992-1-1+NA(D) belegt eine hohe Effizienz der neuartigen Durchstanzbewehrung.

Punching shear behavior of reinforced concrete flat slabs with a varying amount of shear reinforcement

2019 ◽  
Vol 21 (1) ◽  
pp. 235-246 ◽  
Author(s):  
Philipp Schmidt ◽  
Dominik Kueres ◽  
Josef Hegger
Keyword(s):  
Reinforced Concrete ◽  
Shear Behavior ◽  
Punching Shear ◽  
Shear Reinforcement ◽  
Flat Slabs
Sign in / Sign up

Export Citation Format

Share Document