Beam-to-column Web Shear Tab Connections – Minor Axis Column Loading PDF Download
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Author: Andrea Iachetta Publisher: ISBN: Category : Languages : en Pages :
Book Description
"Single plate shear tab connections are commonly used due to their relatively simple design, ease of fabrication and safe erection on-site. They are fillet welded to a supporting column or girder, and then bolted to a supported beam. Extended shear tabs can either frame into the web, a flexible support, or the flange, a rigid support, of a column. The shear tab connection is assumed to function as a pin in the analysis of the overall structure. However, testing has shown that it must withstand shear and moment associated with the eccentricity applied to the shear tab, relative to the support. Current design procedures have little guidance on how to account for this added moment to the column, which may not be a concern for shear tab connections framing into a rigid support (column bending about major axis), but may be more critical when framing into a column’s minor axis (which is considered as a flexible support condition).The existing design procedures for shear tab connections were formulated from past research studies. The 2015 CISC Handbook of Steel Construction lacks a design approach for extended shear tabs. The 2017 AISC Steel Construction Manual has a conservative design approach only based on unstiffened connections, despite the frequent use of stiffened extended shear tab connections. Further research and testing is required to provide recommendations for a more efficient and complete design procedure.Finite element models were used to analyse the behaviour and capacity of beam-to-column web extended shear tab connections. Five validation models were first created to simulate laboratory tests by D’Aronco (2013) to verify the modelling assumptions. The obtained shear forces, rotations and displacements proved to be accurate, confirming that the modelling approach could be used in a subsequent parametric study. The parametric study included the influence of the supporting column, single- vs. double-sided connections, the effect of the type and connection pattern of stabilizer plates, the addition of vertical rows of bolts, the shape of the shear plate, and the effect of the loading protocol.The results demonstrate that the column size, the addition of a vertical row of bolts and the shape of the shear tab did not alter the connection capacity. Also, the welds connecting the stabilizer plates to the column web are not necessary, if the plates are welded to the column flanges. Introducing a gap between the stabilizer plates and the column flanges can benefit the column by reducing the moments applied to it. Finally, the loading protocol greatly influences the connection behaviour; more studies are required to further investigate this aspect"--
Author: Andrea Iachetta Publisher: ISBN: Category : Languages : en Pages :
Book Description
"Single plate shear tab connections are commonly used due to their relatively simple design, ease of fabrication and safe erection on-site. They are fillet welded to a supporting column or girder, and then bolted to a supported beam. Extended shear tabs can either frame into the web, a flexible support, or the flange, a rigid support, of a column. The shear tab connection is assumed to function as a pin in the analysis of the overall structure. However, testing has shown that it must withstand shear and moment associated with the eccentricity applied to the shear tab, relative to the support. Current design procedures have little guidance on how to account for this added moment to the column, which may not be a concern for shear tab connections framing into a rigid support (column bending about major axis), but may be more critical when framing into a column’s minor axis (which is considered as a flexible support condition).The existing design procedures for shear tab connections were formulated from past research studies. The 2015 CISC Handbook of Steel Construction lacks a design approach for extended shear tabs. The 2017 AISC Steel Construction Manual has a conservative design approach only based on unstiffened connections, despite the frequent use of stiffened extended shear tab connections. Further research and testing is required to provide recommendations for a more efficient and complete design procedure.Finite element models were used to analyse the behaviour and capacity of beam-to-column web extended shear tab connections. Five validation models were first created to simulate laboratory tests by D’Aronco (2013) to verify the modelling assumptions. The obtained shear forces, rotations and displacements proved to be accurate, confirming that the modelling approach could be used in a subsequent parametric study. The parametric study included the influence of the supporting column, single- vs. double-sided connections, the effect of the type and connection pattern of stabilizer plates, the addition of vertical rows of bolts, the shape of the shear plate, and the effect of the loading protocol.The results demonstrate that the column size, the addition of a vertical row of bolts and the shape of the shear tab did not alter the connection capacity. Also, the welds connecting the stabilizer plates to the column web are not necessary, if the plates are welded to the column flanges. Introducing a gap between the stabilizer plates and the column flanges can benefit the column by reducing the moments applied to it. Finally, the loading protocol greatly influences the connection behaviour; more studies are required to further investigate this aspect"--
Author: Alireza Mirzaei Publisher: ISBN: Category : Languages : en Pages :
Book Description
"A common approach to connect steel beams to columns is to use single plate shear tabs. Numerous laboratory test programs of these connections subjected to vertical loading alone have been completed over the past 30 years. However, the effect of axial forces on the shear tab's performance has only recently been the subject of study. The presence of an axial force in the shear tab connection will typically result in the need for multiple vertical rows of bolts, which is not addressed in any Canadian design guide. The main objective of the research program described herein was to develop a design approach that could be used by the engineering community to address the effect of combined axial and shear force on a shear tab connection.A series of four full-scale tests were performed on shear tab connections between a W610x140 beam and a W360 x 196 column, as well as a W310 x 60 beam and a W360 x 196 column. The shear tab, which was configured as a double bolt row connection, was subjected to a combined vertical (shear) force and axial tension along with the anticipated rotation of a typical beam-to-column joint. A matching specimen was then tested under shear and axial compression. The results from these tests and previous shear tabs tested under gravity load alone were used in the development of a finite element model that is capable of simulating the response of the connection under shear load; predict the ultimate resistance and the progression of failure. Previous finite element modelling of shear tabs lacked damage simulation capability, did not include the effect of weld tearing, and as such often overestimated the connection resistance. The models presented in this thesis featured special modelling techniques and were able to predict all types of failure modes such as bearing, net area fracture, shear yielding, flexural yielding, and weld tearing of the connections.The FE models were then used to investigate the performance of shear tabs subjected to combined shear and axial force. Shear force-axial force interaction curves were generated for various levels of axial tension and compression force for twelve connections. A design approach was proposed which allows practicing engineers to include the effect of any axial force level in the design of a shear tab connection." --
Author: Akbar R. Tamboli Publisher: McGraw Hill Professional ISBN: 0071550054 Category : Technology & Engineering Languages : en Pages : 654
Book Description
Surveys the leading methods for connecting structural steel components, covering state-of-the-art techniques and materials, and includes new information on welding and connections. Hundreds of detailed examples, photographs, and illustrations are found throughout this handbook. --from publisher description.
Author: Federal Emergency Agency Publisher: FEMA ISBN: Category : Languages : en Pages : 11
Book Description
This report, FEMA-350 - Recommended Seismic Design Criteria for New Steel Moment-Frame Buildings has been developed by the SAC Joint Venture under contract to the Federal Emergency Management Agency (FEMA) to provide organizations engaged in the development of consensus design standards and building code provisions with recommended criteria for the design and construction of new buildings incorporating moment-resisting steel frame construction to resist the effects of earthquakes. It is one of a series of companion publications addressing the issue of the seismic performance of steel moment-frame buildings. The set of companion publications includes: FEMA-350 - Recommended Seismic Design Criteria for New Steel Moment-Frame Buildings. This publication provides recommended criteria, supplemental to FEMA-302 - 1997 NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures, for the design and construction of steel moment-frame buildings and provides alternative performance-based design criteria. FEMA-351 - Recommended Seismic Evaluation and Upgrade Criteria for Existing Welded Steel Moment-Frame Buildings. This publication provides recommended methods to evaluate the probable performance of existing steel moment-frame buildings in future earthquakes and to retrofit these buildings for improved performance. FEMA-352 - Recommended Postearthquake Evaluation and Repair Criteria for Welded Steel Moment-Frame Buildings. This publication provides recommendations for performing postearthquake inspections to detect damage in steel moment-frame buildings following an earthquake, evaluating the damaged buildings to determine their safety in the postearthquake environment, and repairing damaged buildings. FEMA-353 - Recommended Specifications and Quality Assurance Guidelines for Steel Moment-Frame Construction for Seismic Applications. This publication provides recommended specifications for the fabrication and erection of steel moment frames for seismic applications. The recommended design criteria contained in the other companion documents are based on the material and workmanship standards contained in this document, which also includes discussion of the basis for the quality control and quality assurance criteria contained in the recommended specifications. The information contained in these recommended design criteria, hereinafter referred to as Recommended Criteria, is presented in the form of specific design and performance evaluation procedures together with supporting commentary explaining part of the basis for these recommendations.
Author: Alfredo Boracchini Publisher: John Wiley & Sons ISBN: 3433606064 Category : Technology & Engineering Languages : de Pages : 384
Book Description
Dieses Buch führt in alle Aspekte der sicheren Berechnung, Bemessung und Konstruktion von wirtschaftlichen modernen Verbindungen im Stahlbau ein. Die Hintergrunderläuterungen sind nicht an eine spezifische Norm gekoppelt, sondern es werden unterschiedliche Normen und Methoden verglichen, die in der Praxis zur Anwendung kommen, wie z. B. Eurocode, AISC, DIN, BS. Anhand einer Reihe von Beispielen werden Problemlösungen detailliert beschrieben und illustriert. Damit erhält der Leser alle notwendigen Werkzeuge an die Hand, um auch komplexe Probleme bei der Konstruktion von Verbindungen zu lösen. Das Buch ist für Berufseinsteiger, für erfahrene Praktiker sowie auch für Stahlbaufachleute eine Arbeitshilfe, denn es werden einfache und komplexe Beanspruchungen an Verbindungen abgebildet. Weniger ausführlich werden Erdbebenauslegung, Schweißnähte, die Wechselwirkung mit anderen Materialien (Beton, Holz) und kalt geformte Verbindungen behandelt.
Author: Andrea Iachetta
Author: Andrea Iachetta
Author: J. D. Graham
Author: Alireza Mirzaei
Author: 
Author: SAC Joint Venture. Guidelines Development Committee
Author: Akbar R. Tamboli
Author: Federal Emergency Agency
Author: SAC Joint Venture. Guidelines Development Committee
Author: Alfredo Boracchini
Author: