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Author : Daeyong Lee
Publisher :
ISBN 13 :
Total Pages : 426 pages
Book Rating : 4.3/5 (91 download)
Download or read book Seismic Behavior of Column-base Plate Connections Bending about Weak Axis written by Daeyong Lee and published by . This book was released on 2001 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mohamed Fahmy
Publisher :
ISBN 13 :
Total Pages : 396 pages
Book Rating : 4.3/5 (91 download)
Download or read book Seismic Behavior of Moment-resisting Steel Column Bases written by Mohamed Fahmy and published by . This book was released on 2000 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Md Asif Bin Kabir
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (128 download)
Download or read book Behavior of Exposed Column Base Plate Connection Subjected to Combined Axial Load and Biaxial Bending written by Md Asif Bin Kabir and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Column base plate (CBP) connections are one of the most crucial structural components of steel structures that act as a transfer medium for all the forces and moments from the entire building into the foundation. Importance of this type of connection becomes significant when the structure experiences dynamic loading, such as wind or earthquake, which incorporates dynamic effects in the structure that need to be transferred to the foundation. Considerable research efforts have been made over the past few decades on CBP connections, which led to the publication of AISC Design Guide 1 (2006) for CBP design. This design guide is still widely used in the industry. All the previous studies and design guidelines considered only the uniaxial (major axis) bending moment combined with axial load for CBP connection design. However, very often the base plate experiences a bidirectional bending moment from lateral loads during any dynamic loading event. Although, the column is designed and checked under combined axial load and bi-axial bending, when it comes to the base plate connection, only the axial load and major axis bending are considered. Therefore, the objective of this research is to investigate the behavior of CBP connections subjected to combined axial load and biaxial bending through an extensive numerical parametric study, using general purpose finite element software ABAQUS. For this numerical study, an accurate nonlinear finite element (FE) model is developed, considering both geometric and material nonlinearities and validated against experimental results that are available in the literature subjected to monotonic and uniaxial cyclic loading. Validation results show that the developed FE model can effectively simulate force transfer at major contact interfaces in the connection. Concurrently, a database of CBP connection subjected to axial load and uniaxial bending, is constructed from the literature to identify the influential parameters as well as different failure modes of the CBP connection, using Machine Learning (ML) approach. Among nine different ML models, the Decision tree based ML model provides an overall accuracy of 91% for identifying the failure mode whereas base plate thickness, embedment length, and anchor rod diameter are found to be the influential parameters that govern the failure mode of CBP connections. Therefore, a total of 20 different FE models that have different base plate thicknesses and yield strengths, anchor bolt sizes and quantity as well as embedment lengths, grout thicknesses and axial load ratios are developed. Furthermore, a bidirectional symmetric lateral loading protocol is developed and applied with constant axial compressive load in the developed models. The study reveals that the thickness of base plate and anchor rod diameter are the governing parameters for different base connection behavior such as moment rotation response, maximum bolt tensile force, and yield line pattern of the base plate. Moreover, the rigidity of the base plate connection is found to be in the semi-rigid region under biaxial bending condition. Finally, this study found that the available methods for uniaxial bending overpredicts the connection rotational stiffness compared to the stiffness obtained from numerical analysis considering biaxial bending.
Author : Frida Pettersson
Publisher :
ISBN 13 :
Total Pages : 147 pages
Book Rating : 4.:/5 (956 download)
Download or read book A Study on the Behavior of Deep, Slender Wide Flange Steel Beam-column Members in Seismic Applications written by Frida Pettersson and published by . This book was released on 2016 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: To economically control the drift limits in special moment frames (SMFs), deeper columns than the traditional W14 sections have become more common. The drift of an SMF can be reduced by increasing the bending and shear stiffness of the columns in the frame, and this would also be accomplished by using deeper sections (Shen 2002). However, deeper columns need to be checked against instability since they are more sensitive to local buckling and weak-axis failure modes than stockier columns (NEHRP 2011). The SAC project investigated the behavior of steel moment resisting frame connections after the Northridge Earthquake and some results were extrapolated to column and beam members. However, the project only produced data that led to the prequalification of RBS connections for use with W12 and W14 columns. When testing was performed with deeper column sections, stability problems occurred (FEMA 2000). This study analytically investigates the behavior of deep columns with an exterior RBS connection in a special moment frame. The 40 assemblies studied were designed according to the AISC Provisions (AISC 341, AISC 358, and AISC 360) and modeled with finite element software. A floor slab was not included and monotonic loading displaced the beam tip by 6.0 in. Column sections investigated were W14x426, W24x192, W27x194, and W30x191. The columns were subjected to varying levels of axial load and had medium or weak panel zone strength. Geometric imperfections were included in all models, and some models also included residual stresses. From this study it was concluded that the column depth does not impact the behavior of the connection and deep columns can be used in SMFs. The results show that axial loads have no effect on the column behavior until very high axial loads are applied. It was also shown the twist of the column increases with increasing column depth. Columns with a doubler plate twist more than cases without a doubler plate and the column twist decreases with an increasing axial load.
Author : Piyachai Chansuk
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)
Download or read book Seismic Behavior and Design of Deep, Slender Wide-flange Structural Steel Beam-columns written by Piyachai Chansuk and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Twenty-one W24 hot-rolled columns of ASTM A992 steel with five different sections were tested in Phase 1 of this research program to investigate the effects of slenderness parameters, constant axial load levels, lateral drift loading sequences, and weak-axis bending on the column base responses. It was observed that the webs of these sections with much larger h/ ratios were not as effective in restraining and delaying flange local buckling as those of shallow and stocky (e.g., W12 or W14) columns. Specimens with sections that satisfied the highly ductile requirement in the AISC Seismic Provisions still experienced significant damage and axial shortening due to the interactive flange and web local buckling. An unusual failure mode with local buckling coupled with lateral-torsional buckling was also observed for the first time. Based on these tests results, observed buckling modes were classified, and a simplified procedure to predict the governing buckling mode was proposed. Additional 23 columns including W14, W18, W24, and W30 sections were tested to further evaluate the effects of section depths, boundary conditions, and varying axial loads. Test results revealed that findings from Phase 1 testing could be extrapolated to deeper and shallower sections; the proposed procedure predicted very well the buckling mode of Phase 2 specimens. Allowing the column top end to rotate increased the story drift capacity but did not change the buckling mode. Results from varying axial load tests showed that first-story exterior columns behave very differently from the interior ones. W14 column test results showed that classifying a column as deep or shallow based on the nominal section depth may be inappropriate; the deep column phenomenon with significant interactive local buckling could develop in W14 columns with relatively slender web and flanges.
Author : Rishi Gupta
Publisher : Springer Nature
ISBN 13 : 3031341597
Total Pages : 1180 pages
Book Rating : 4.0/5 (313 download)
Download or read book Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 written by Rishi Gupta and published by Springer Nature. This book was released on 2023-08-05 with total page 1180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the proceedings of the Annual Conference of the Canadian Society of Civil Engineering 2022. The contents of this volume focus on specialty conferences in construction, environmental, hydrotechnical, materials, structures, transportation engineering, etc. This volume will prove a valuable resource for those in academia and industry.
Author : John T. DeWolf
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.3/5 (91 download)
Download or read book Column Base Plates written by John T. DeWolf and published by . This book was released on 1990 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Federico Mazzolani
Publisher : CRC Press
ISBN 13 : 0203861590
Total Pages : 998 pages
Book Rating : 4.2/5 (38 download)
Download or read book Behaviour of Steel Structures in Seismic Areas written by Federico Mazzolani and published by CRC Press. This book was released on 2009-12-03 with total page 998 pages. Available in PDF, EPUB and Kindle. Book excerpt: Behaviour of Steel Structures in Seismic Areas comprises the latest progress in both theoretical and experimental research on the behaviour of steel structures in seismic areas. The book presents the most recent trends in the field of steel structures in seismic areas, with particular reference to the utilisation of multi-level performance bas
Author : Gulen Ozkula
Publisher :
ISBN 13 :
Total Pages : 270 pages
Book Rating : 4.:/5 (989 download)
Download or read book Seismic Behavior, Modeling and Design of Deep Wide-Flange Steel Columns for Special Moment Frames written by Gulen Ozkula and published by . This book was released on 2017 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steel Special Moment Frame (SMF) is a preferred seismic force-resisting system for its architectural flexibility and high ductility. To achieve economy in design and construction, there is a growing trend to use deeper columns (e.g., with a section depth larger than 14 in.) to limit the code-enforced story drift requirements in recent years. A deep column has larger slenderness ratios and is more vulnerable to both local and global buckling. Since AISC Seismic Provisions assume that plastic hinging will occur at not only beam ends but also column bases, little research was available on the deep column hinging behavior under axial compression and cyclic drift. A full-scale test program with thirty-seven deep columns subjected to both axial compression and cyclic drift was conducted. Test variables included sectional and member slenderness ratios for local and global buckling controls, axial force level, axial force type (constant versus variable), boundary condition (fixed-fixed versus fixed-flexible), transvers loading type (monotonic, cyclic, or near-faulty), axis of bending (strong-axis versus weak-axis) and bending type (uniaxial versus biaxial). From the database of this test program and a prior one with shallow (W14) stocky columns, three buckling modes were identified. Significant shortening was common to two buckling modes that were typical in deep columns, but not in shallow and stocky columns. While the observed buckling modes could be properly simulated by nonlinear finite element simulation, a practical procedure to predict the governing buckling mode was needed for both cyclic modeling and design purposes. One procedure which considered the interaction between flange and web local buckling was first proposed; the accuracy of the procedure was verified by results from both tested columns and a large number of numerically simulated columns. Second, the combined experimental and numerically simulated database was then used in a multi-variate regression analysis to establish expressions for the cyclic backbone curves; these curves are needed for ASCE 41-type performance-based nonlinear response analysis of SMF. Finally, the same database was used to establish the limiting width-thickness ratios for potential adoption by AISC Seismic Provisions. A novel approach which considered the axial shortening as the limit state was proposed to establish these limiting width-thickness ratios for column design.
Author : Ivan Ricardo Gomez
Publisher :
ISBN 13 : 9781124315713
Total Pages : pages
Book Rating : 4.3/5 (157 download)
Download or read book Behavior and Design of Column Base Connections written by Ivan Ricardo Gomez and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigates the design and behavior of column base plate connections, a common structural component used to transfer forces from the steel superstructure to the supporting concrete foundation. Laboratory testing and damage reported in recent earthquakes has demonstrated the susceptibility of these connections to various failure modes. However, compared to other structural connections, column bases have received relatively limited research attention. In order to characterize the connection behavior, results from two series of large-scale testing are presented. The first phase of testing investigates common base connection shear transfer mechanisms, including plate friction, anchor rod bearing and shear key bearing. The second phase of testing investigates the response of exposed bases subjected to axial compression and flexural loading. The test observations are complimented by detailed test analyses and FEM simulations. A detailed review of existing design provisions, design guides and published research reveals that current approaches to characterize the behavior of exposed column base connections loaded in shear or a combination of axial compression and flexure are not well developed nor supported by adequate experimental validation. Thus, the test data is used to evaluate existing approaches and propose refinements. For example, the tests investigating shear key bearing indicate that current strength design provisions may be significantly unconservative for large foundations due to the size effect in concrete. Furthermore, an evaluation of experimental data indicates that the current design methods for flexural loading may be highly conservative with respect to the ultimate strength of the connection. A design approach is proposed in which the ultimate strength of the connection is governed by the formation of a plastic mechanism. All test specimens show outstanding ductility, suggesting that reliable inelastic action is possible for base plate connections. Additional methods, which are based on the concept of the center-of-rotation of the base plate, are proposed to characterize the anchor rod forces and the initial moment-rotation behavior. The proposed behavior predictions are highly accurate with respect to the test data. The dissertation concludes with a detailed overview of current design provisions along with analysis and recommendations for design.
Author : Earthquake Engineering Research Institute
Publisher :
ISBN 13 :
Total Pages : 666 pages
Book Rating : 4.X/5 (3 download)
Download or read book Seventh U.S. National Conference on Earthquake Engineering written by Earthquake Engineering Research Institute and published by . This book was released on 2021 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the twenty-ninth volume in the Earthquake Engineering Research Institute's series, Connections: The EERI Oral History Series. EERI began this series to preserve the recollections of some of those who have had pioneering careers in the field of earthquake engineering. Significant, even revolutionary, changes have occurred in earthquake engineering since individuals first began thinking in modern, scientific ways about how to protect construction and society from earthquakes. The Connections series helps document this important history. This volume in the EERI Oral History Series presents the life and career of Anil K. Chopra, Professor Emeritus in the Department of Civil and Environmental Engineering at the University of California, Berkeley. After he graduated from college in India, he went to UC Berkeley to earn his Master's and PhD degrees, then taught at the University of Minnesota before returning to join the faculty of UC Berkeley for the next 47 years, retiring in 2016. The first class he was asked to teach at UC Berkeley was structural dynamics, a course which had been started by his mentors, Ray Clough and Joe Penzien. His work in that field resulted in a number of publications on a wide range of topics in earthquake engineering and structural dynamics. Chopra chaired the structural analysis committee of the project producing the influential ATC-3, Tentative Provisions for the Development of Seismic Regulations for Buildings, and he tells interesting stories about working with Nate Newmark, Emilio Rosenblueth, Henry Degenkolb, and others. His expertise in structural dynamics resulted in his being asked to write the EERI monograph on structural dynamics, Dynamics of Structures: A Primer, and later led to his very widely used university textbook, Dynamics of Structures: Theory and Application to Earthquake Engineering, now in its fifth edition. A major theme in Chopra's research is the seismic analysis and design of concrete dams. He and a number of PhD students developed procedures for earthquake analysis of concrete dams, and he has consulted on dozens of major projects around the world. In 2020 he published his comprehensive book on the subject, Earthquake Engineering for Concrete Dams: Analysis, Design, and Evaluation.
Author : Patxi Uriz
Publisher :
ISBN 13 :
Total Pages : 940 pages
Book Rating : 4.:/5 (35 download)
Download or read book Towards Earthquake Resistant Design of Concentrically Braced Steel Structures written by Patxi Uriz and published by . This book was released on 2005 with total page 940 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, there has been a shift in typical steel construction from moment frames to concentrically braced frames for use in regions of high seismic risk in the United States. Given the large increase in popularity, it is surprising to find that large-scale testing of subassemblages or components of special concentric braced frames is sparse, particularly with frames containing conventional buckling braces and modern construction details. Rigorous analytical modeling of structures with proportions and details typical to those used in concentrically braced frames today are also limited. Test validated analytical models are paramount to adequately predict and assess performance of these structures when subjected to severe ground shaking.
Author : David Grilli
Publisher :
ISBN 13 : 9781339261584
Total Pages : pages
Book Rating : 4.2/5 (615 download)
Download or read book Seismic Response of Embedded Column Base Connections and Anchorages written by David Grilli and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigates the seismic response of Embedded Column Base (ECB) connections and anchor groups, and the rotational stiffness characteristics of exposed column base connections. The research presented is intended to address various unresolved issues on the seismic performance of column base connections. ECB connections are common components in mid- to high- rise steel moment frames, used to transfer base moments and forces into the footing. Despite their prevalence, published research on ECB connections is sparse, and a strength characterization method is yet to be established. Additionally, column base connections are often designed for uplift, requiring use of an anchoring system. Provisions in ACI 318-Appendix D generally govern such systems. However, an alternative detail has become increasingly common, wherein anchors are embedded in the footing with a plate at their lower end, also embedded in the footing. This configuration is subject to less cumbersome design requirements, though no experimental data or validated design guidelines are available to support the design of this detail.Three studies are presented, investigating (1) seismic response of EBC connections, (2) tensile capacity of anchor groups, and (3) rotational stiffness of exposed base connections. The first study includes five full-scale tests on ECB connections subjected to cyclic lateral deformations in the presence of an axial (tensile or compressive) load. Test variables for ECB connections tests include embedment depth, axial load, and column size. The connections demonstrated excellent deformation capacity, and based on test observations, it is determined that ECB connections resist applied moment, axial force, and shear through a combination of the following mechanisms: (1) horizontal bearing stresses acting on the column flanges (2) vertical bearing stresses acting on the embedded base plate at the bottom of the column, and (3) panel shear. In addition, it was determined that although designed as rotationally fixed, the specimens have some flexibility which must be considered in simulation and design. Based on observations, a method is developed to predict the strength of and ECB connection, for the purposes of developing a design model. The method shows good agreement with test data (1.01 test-to-predicted ratio), however, careful application of the method is recommended due to its reliance on empirical factors calibrated to a limited data sample. The second study involves two full-scale tests on anchors grouped to an embedded plate, and analyzes the effect of plate embedment depth (12 and 18 inches) on concrete breakout strength. The results are compared to three strength models, including ACI 318-Appendix D method, the ACI 318 punching shear equation, and the Concrete Capacity Design (CCD) method. It is determined that The CCD method shows the most promise, with an average test-predicted ratio of 0.99, while the ACI 318-Appendix D method and ACI 318 punching shear method appeared conservative and unconservative, respectively. Limitations of the study include the small size of the test set, and the absence of reinforcement in the specimens. The third study was conducted to address observations of significant rotational flexibility in exposed base connections. A method is presented to predict the rotational stiffness of an exposed base connection, validated by experimental data. The method is particularly accurate for conditions where the moment to axial load ratio is large, whereas it overestimates the stiffness of connections where this ratio is low. A detailed analysis and discussion of limitations of each study is provided.
Author : Luis Bernardo Fargier-Gabaldón
Publisher :
ISBN 13 :
Total Pages : 412 pages
Book Rating : 4.3/5 (91 download)
Download or read book Seismic Behavior of Reinforced Concrete Column-to-steel Beam (RCS) Connections with Special Configurations written by Luis Bernardo Fargier-Gabaldón and published by . This book was released on 2005 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gustavo Parra-Montesinos
Publisher :
ISBN 13 :
Total Pages : 632 pages
Book Rating : 4.3/5 (91 download)
Download or read book Seismic Behavior, Strength and Retrofit of Exterior RC Column-to-steel Beam Connections written by Gustavo Parra-Montesinos and published by . This book was released on 2000 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 816 pages
Book Rating : 4.3/5 (91 download)
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chang-Koon Choi
Publisher :
ISBN 13 :
Total Pages : 882 pages
Book Rating : 4.:/5 (318 download)
Download or read book Proceedings of the First International Conference on Steel & Composite Structures written by Chang-Koon Choi and published by . This book was released on 2001 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt:
