Download or read book Analyzing the Failure Mechanisms and Developing Strength Prediction Models for Concrete Expansion and Screw Anchors In Tension written by Zhao Chen and published by . This book was released on 2018 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete anchors serve as the connections between structural elements in various applications in concrete structures. This dissertation focused on investigating two popular post-installed mechanical anchors, torque-controlled expansion (TCE) anchors and screw anchors, and their common failure modes. TCE anchors commonly fail in a Pull-through mode when installed at deep effective embedment depths (hef). Screw anchors typically fail in a Combined mode of Pull-out and Concrete breakout modes. However, research on these failure modes are scarce and no design model is available to predict the ultimate tensile strength (Nu) of these failure modes in the current design codes. A total of 128 tension tests on TCE anchors from 3 manufacturers in 3 diameters were tested in 2 hef per diameter. Both failure modes and Nu are found dependent on hef and diameter. Using ABAQUS, finite element models (FEM)s of TCE anchors were developed and matched well with the test results regarding failure modes, load-displacement behavior, and ultimate strength. Total of 144 tension tests on screw anchors from 3 manufacturers in 3 diameters and 2 hef per diameter were conducted. Approximately 80% of the tested anchors failed in the Combined mode and Ncomb was found linearly correlated to hef 1.3 but slightly dependent on anchor diameter. FEMs were also developed for screw anchors. Combine failure mode was observed for both deep and shallow embedment depths. Good agreements were found in load-displacement behavior and Ncomb between FEMs and test results. Based on parametric studies using additional FEM simulations, prediction models for predicting Nu of the pull-through mode of TCE anchors and Combined mode of screw anchors, individually, was developed and showed good agreements with the test results. Post-installed anchors are frequently installed with abandoned drilled hole (ADH)s at the job site. Total of 60 TCE anchors were tested at two scenarios of hole conditions: 1) reference (no hole), and 2) one ADH drilled at 2xd offset. The ADH scenario resulted in (~4.5-21%) reduction in Nu, regardless of the failure mode, and the percent reductions decreased as diameter and/or hef increased. An area method was developed to predict the reduced Nu in the ADH scenario.

Download or read book Design of anchorages in concrete written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2011-01-01 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite the widespread use of cast-in-place and post-installed anchors in construction, the overall level of understanding in the engineering community regarding their behaviour remains quite limited. Furthermore, since the publication of the original CEB design guide, “Design of Fastenings in Concrete”, ongoing research and additional application experience has led to an improved understanding and deepened knowledge in various areas of fastening technology. fib Bulletin 58 therefore represents a substantial revision of the original 1997 guide. It addresses a variety of loading types and failure modes and takes into account the current state of the art for anchorages in new construction as well as for their use in the repair and strengthening of existing concrete structures. fib Bulletin 58 provides a method for the design of the anchorage and additional rules for the design of the concrete member to which the load is transferred. The specified provisions are based on the currently available research.

Download or read book Anchors in Concrete design and Behavior written by George A. Senkiw and published by . This book was released on 1991 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Anchorage in Concrete Construction written by Rolf Eligehausen and published by John Wiley & Sons. This book was released on 2013-10-30 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Das Buch stellt den aktuellen Stand der kompletten Befestigungstechnik für Beton und Mauerwerk mit Einlegeteilen (Ankerschienen, Kopfbolzen), Dübeln (Metallspreizdübel, Hinterschnittdübel, Verbunddübel, Betonschrauben, Kunststoffdübel) und Setzbolzen umfassend dar. Die Befestigungselemente und ihre Wirkungsmechanismen werden ausführlich beschrieben und das Tragverhalten im ungerissenen und gerissenen Beton untersucht. Weiterhin werden das Korrosionsverhalten, das Verhalten bei Brandbeanspruchung sowie bei Erdbeben- und Schockbeanspruchung behandelt. Von besonderer internationaler Aktualität ist die Bemessung gemäß der europäischen und amerikanischen Normung. Praxisorientierte Kriterien zur Auswahl von Befestigungsmitteln und Bemessungsbeispiele runden das Werk zu einem einzigartigen Handbuch ab.

Download or read book ACI Materials Journal written by and published by . This book was released on 2003 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of the Failure Mechanism and Moment Capacity Prediction in a Ten Bolt Flush End Plate Moment Connection written by Godwin Addiah Arthur and published by . This book was released on 2010 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: Moment end plate connections have found their usage in a number of applications and extensive research has been done on smaller capacity connections of such type. This study seeks to investigate the failure mechanism and the subsequent prediction of the moment capacity of a ten bolt flush end plate connection. The model under study is typical of a flush end plate connection present in an existing steel parking deck. Yield line analysis methods have been employed in analyzing the various failure mechanisms and have been used in developing prediction equations for the design of the end-plate. The modified Kennedy method has also been used in the prediction of the bolt forces for all cases of the analysis with failed bolts. A three dimensional finite element model using ABAQUS Standard has been employed to validate the results from the analytical methods taking into consideration, the interactions between the connection components, boundary conditions and material non-linearities. The moment capacity and the corresponding failure mechanism is predicted under two cases of bolt loss in rows of the connection. Limit state of end plate yielding governs the design for the ten bolt connection and that with one row of bolt failure at the top. Bolt fracture governs the design when there are two rows of failed bolts.

Download or read book Fastenings to Concrete and Masonry Structures written by Comité euro-international du béton and published by Thomas Telford. This book was released on 1994 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern fastening techniques are increasingly being used to transfer loads into concrete and masonry structures. This book aims to compile and compare research on the behaviour of fastening systems. It also proposes an approach to the design of fastenings based on empirical and theoretical models.

Download or read book Probabilistic Models for the Resistance of Concrete Anchors written by Pawlo F. Hokkanen and published by Springer. This book was released on 1999-09-21 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1994 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book PRO 21 International RILEM Symposium on Connections Between Steel and Concrete Set written by Rolf Eligehausen and published by RILEM Publications. This book was released on 2001 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bond Characteristics of High Strength Concrete written by Mehdi Alavi-Fard and published by . This book was released on 1999 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fastenings to Concrete and Masonry Structures written by Comité euro-international du béton and published by Thomas Telford. This book was released on 1994 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern fastening techniques are increasingly being used to transfer loads into concrete and masonry structures. This book aims to compile and compare research on the behaviour of fastening systems. It also proposes an approach to the design of fastenings based on empirical and theoretical models.

Download or read book ACI Structural Journal written by and published by . This book was released on 2008 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Evaluation of Mechanical Expansion Anchors written by John P. Dusel and published by . This book was released on 1987 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Evaluation of Mechanical Expansion Anchors written by Craig N. Harrington and published by . This book was released on 1988 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Adhesive bonded Anchors written by and published by . This book was released on 1994 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development and Assessment of Response and Strength Models for Bolted Steel Connections Using Refined Nonlinear 3D Finite Element Analysis written by Ahmet Muhtar Citipitioglu and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The difficulty in developing bolted connection designs lies in the limitations in existing methods to characterize their strength and typically nonlinear response due to the complex interaction of the bolts and structural components. Yet it is necessary for the engineer to be able to determine the three main connection response characteristics: stiffness, strength, and ductility to account for their influence on the overall structural response behavior. The need for better connection response characterization becomes even more crucial in a performance based design approach or when designing partially-restrained moment frames. Several welded moment resisting frame connections were found to have serious failures following the 1994 Northridge earthquake leading to more interest and research on bolted connections as an alternative. In this study a refined three dimensional nonlinear finite element modeling approach to accurately simulate the response of bolted connections is presented. Sensitivity studies of modeling parameters are also performed. A nonlinear response dataset of over 400 connection cases is generated using this approach with a parametric bolted angle connection model. The use of a parametric Richard-Abbott type function and a neural network, calibrated using the response dataset, as practical tool to model the nonlinear stiffness response of bolted connections under monotonic loading is demonstrated and assessed. Failure criteria that can be practically used in conjunction with the refined three dimensional finite element models without any additional modeling requirements are developed. The stress modified critical strain (SMCS) criterion based on the void growth and coalescence mechanism initiating ductile fracture in steel is used for determining failure in the connection member. The bolt failure criterion developed is a mechanics based model using the elliptical interaction of the tensile and shear capacity envelope. The failure criteria and bolted angle response dataset is combined to assess in detail the impact of geometry and topography of the bolted angle connections on the following response characteristics: strength, initial stiffness, plastic stiffness, and absolute ductility or the displacement capacity. Finally, using the dataset of bolted angle connection response, along with their capacities and failure modes determined using the developed failure criteria, the prying strength models in the AISC LRFD Specifications, Eurocode, and a hybrid model are assessed and found to be very conservative for some cases. Based on these results a modified Eurocode and hybrid prying strength model is proposed which greatly improves the prying strength prediction. These prying models are assessed and verified using experimental data found in literature.