scholarly journals Shear Resistance Mechanism of Extremely Short Columns Constituted by Thin Steel Plates with Ribs and Fiber Sheets as Shear Reinforcement

2013 ◽  
Vol 24 (3) ◽  
pp. 173-181
Author(s):  
Yoshinori Itoh ◽  
Eiji Makitan ◽  
Masaharu Nakazato ◽  
Eisuke Saitoh
Keyword(s):  
Resistance Mechanism ◽  
Shear Resistance ◽  
Steel Plates ◽  
Shear Reinforcement ◽  
Short Columns ◽  
Thin Steel

scholarly journals Shear Performance of Steel Fibers in Reinforced Concrete Beams

2019 ◽  
Vol 9 (2) ◽  
pp. 345-350
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Resistance Mechanism ◽  
Shear Resistance ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Reinforced Concrete Beams ◽  
Experimental Program ◽  
Shear Reinforcement ◽  
Shear Span

Over the past few decades, a significant growth was observed on utilization of steel fibers in Reinforced Concrete (R.C) members. Past research studies on hybrid concrete endorsed optimum utilization of steel fibers (1.5% by volume) as it effectively contributed to improve flexural properties of reinforced concrete members such as R.C beams and slabs .But the contribution of fibers against shear resistance mechanism of R.C beams are not identified well in the previous research. In this context an experimental program was conducted to find Shear contribution and associated Parameters of fibers in the Steel Fiber Reinforced Concrete (SFRC) beams. A series of test programmes are conducted on three full scale reinforced concrete beams (NSF: No steel fibers, BSF1: Steel fibers in shear span, BSF2: Steel fibers in full span) with different configuration of shear reinforcement by using varied range of SFRC in the tested beam. The test results evaluated on the basis of strength and durability aspects at service loads and limit of failure conditions. The results concluded that the presence of steel fibers in reinforced concrete beam significantly contributed to induce shear resistance mechanism and ductile property of R.C beam. This improvement observed in BSF2, when the SFRC constituted in shear span region and the rest of R.C beam arranged with minimum conventional stirrups as shear reinforcement. Further the steel fibers possess good compatibility with concrete and steel reinforcement ,which enhance mechanical and serviceability conditions of R.C beam such as shear strength, ductility, stiffness with respect to strength and deflection, crack width during serviceability conditions of the beam.

scholarly journals Computational Modeling and Constructal Design Theory Applied to the Geometric Optimization of Thin Steel Plates with Stiffeners Subjected to Uniform Transverse Load

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 220 ◽  
Author(s):  
Grégori Troina ◽  
Marcelo Cunha ◽  
Vinícius Pinto ◽  
Luiz Rocha ◽  
Elizaldo dos Santos ◽  
...  
Keyword(s):  
Computational Modeling ◽  
Design Theory ◽  
Degrees Of Freedom ◽  
Volume Fraction ◽  
Geometric Optimization ◽  
Steel Plates ◽  
Transverse Load ◽  
Constructal Design ◽  
Thin Steel ◽  
Reference Plate

Stiffened thin steel plates are structures widely employed in aeronautical, civil, naval, and offshore engineering. Considering a practical application where a transverse uniform load acts on a simply supported stiffened steel plate, an approach associating computational modeling, Constructal Design method, and Exhaustive Search technique was employed aiming to minimize the central deflections of these plates. To do so, a non-stiffened plate was adopted as reference from which all studied stiffened plate’s geometries were originated by the transformation of a certain amount of steel of its thickness into longitudinal and transverse stiffeners. Different values for the stiffeners volume fraction (φ) were analyzed, representing the ratio between the volume of the stiffeners’ material and the total volume of the reference plate. Besides, the number of longitudinal (Nls) and transverse (Nts) stiffeners and the aspect ratio of stiffeners shape (hs/ts, being hs and ts, respectively, the height and thickness of stiffeners) were considered as degrees of freedom. The optimized plates were determined for all studied φ values and showed a deflection reduction of over 90% in comparison with the reference plate. Lastly, the influence of the φ parameter regarding the optimized plates was evaluated defining a configuration with the best structural performance among all analyzed cases.

scholarly journals Lateral shear strength of rectangular RC columns subjected to combined P-V-M monotonic loading

2020 ◽  
Vol 53 (4) ◽  
pp. 227-241
Author(s):  
Aysha M Zaneeb ◽  
Rupen Goswami ◽  
C V R Murty
Keyword(s):  
Shear Strength ◽  
Test Data ◽  
Rectangular Cross Section ◽  
Resistance Mechanism ◽  
Bending Moment ◽  
Shear Resistance ◽  
Shear Capacity ◽  
Longitudinal Reinforcement ◽  
Lateral Shear ◽  
Rc Columns

An analytical method is presented to estimate lateral shear strength (and identify likely mode and location of failure) in reinforced concrete (RC) cantilever columns of rectangular cross-section under combined axial force, shear force and bending moment. Change in shear capacity of concrete with flexural demand at a section is captured explicitly and the shear resistance offered by concrete estimated; this is combined with shear resistance offered by transverse and longitudinal reinforcement bars to estimate the overall shear capacity of RC columns. Shear–moment (V-M) interaction capacity diagram of an RC column, viewed alongside the demand diagram, identifies the lateral shear strength and failure mode. These analytical estimates compare well with test data of 107 RC columns published in literature; the test data corresponds to different axial loads, transverse reinforcement ratios, longitudinal reinforcement ratios, shear span to depth ratios, and loading conditions. Also, the analytical estimates are compared with those obtained using other analytical methods reported in literature; in all cases, the proposed method gives reasonable accuracy when estimating shear capacity of RC columns.  In addition, the method provides insights into the shear resistance mechanism in RC columns under the combined action of P-V-M, and it is simple to use.

Design of Transverse Fillet Welds in the Lapped Joints of Thin Steel Plates

2018 ◽  
Vol 18 (1) ◽  
pp. 337-348
Author(s):  
Shahabeddin Torabian ◽  
Feng Xiao ◽  
Richard B. Haws ◽  
Benjamin W. Schafer
Keyword(s):  
Steel Plates ◽  
Fillet Welds ◽  
Thin Steel

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.

scholarly journals Shear resistance of welded inclined bars in rectangular reinforced concrete beams

2018 ◽  
Vol 250 ◽  
pp. 03003
Author(s):  
Noor Suhaida Galip ◽  
Roslli Noor Mohamed ◽  
Ramli Abdullah
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Concrete Beams ◽  
Shear Resistance ◽  
Reinforced Concrete Beams ◽  
Shear Reinforcement ◽  
Shear Forces ◽  
Distance Ratio ◽  
Effective System ◽  
Horizontal Portion

The bent-up bars have not been used as shear reinforcement in beams since the past 40 years or so. In all cases of design and construction nowadays, shear forces are resisted by vertical links only. Some complications in installing the multiple set of bent-up bars, the less opportunity to have sufficient number of bent-up bars due to small number of flexural reinforcement provided at the mid-span of the beams and also the large anchorage required for the horizontal portion of the bars beyond the upper end of the bend could be the reasons behind this. This paper presents the results of tests on five rectangular reinforced concrete beams in which the effectiveness of welded inclined bars (WIB) as shear reinforcement was studied. Two of the beams were controlled specimens, with no shear reinforcement in one, and full design vertical links in another. The other three beams were provided with three different quantities of WIB, measured in terms of area to distance ratio, Asw / S as shear reinforcement in the shear spans. All beams were tested to failure under two point loads with a shear span to effective depth ratio of 2.34, which would ensure that the failure was due to shear unless their shear capacities were larger than the flexural capacity. The performances of the beams were measured in terms of deflection, crack formation, strains in WIB and on the concrete surfaces in the shear region, ultimate loads and failure modes. The results show that WIB alone is capable of carrying the whole shear forces in the beam, and larger shear capacities are achieved with a larger quantity of WIB, and a higher grade of the bars used. The beam with WIB requires 22% less in the quantity of Asw / S compared to that with vertical links to achieve the same shear resistance. These suggest that WIB can be used as an effective system of shear reinforcement in beams.

Fracture analysis of corroded cold-formed thin steel plates based on actual morphology using micromechanical models

2021 ◽  
Vol 267 ◽  
pp. 120899
Author(s):  
Haijiang Zhang ◽  
Shanhua Xu ◽  
Zongxing Zhang ◽  
Biao Nie ◽  
Liang Wang
Keyword(s):  
Fracture Analysis ◽  
Steel Plates ◽  
Thin Steel ◽  
Micromechanical Models
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