Download or read book Seismic Behavior of Deep Slender Wide Flange Structural Steel Beam columns written by Piyachai Chansuk and published by . This book was released on 2018 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates nonlinear cyclic responses of deep wide-flange steel beam-columns, which are primarily used in Special Moment Frame (SMF) for their high in-plane, strong-axis moment of inertia to satisfy story drift limits specified in building codes. SMF design principles aim to achieve energy dissipation through plastic hinging of the beams, while flexural yielding of the columns at the base is also permitted. Although behavior of the beams has been extensively researched, that of the columns is lacking especially for deep columns (e.g., W18 to W36). Therefore, cyclic testing of deep columns was conducted to generate experimental database. Due to large width-to-thickness ratios of these sections, test results showed significant web and flange local buckling; some specimens also exhibited lateral-torsional buckling. These local and global instabilities resulted in significant axial shortening and flexural strength degradation. These behaviors differ significantly from those observed in prior testing of shallow W14 columns, featuring excellent ductility capacity at high axial loads. Additionally, the test matrix was designed to investigate the effects of section depths, varying axial loads, lateral-drift loading sequences, and boundary conditions on the column responses. Inevitably in this testing, the responses were also influenced by flexibility of column-end connections. To eliminate this undesired variable from the responses, a procedure was developed to correct the lateral drift response based on the second-order Timoshenko elastic theory. The effects of boundary conditions were further investigated using high-fidelity finite element software ABAQUS. Results show that fixed-fixed and fixed-rotating column responses can be converted to one another.

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.

Download or read book Research Plan for the Study of Seismic Behavior and Design of Deep Slender Wide Flange Structural Steel Beam column Members written by NEHRP Consultants Joint Venture and published by . This book was released on 2017 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this task was to develop a comprehensive long-range plan to research the seismic behavior of deep, slender wide flange structural steel beam-columns in steel frames. Development of the plan included the investigation of available information on beam-column member and connection behavior in the literature, and considered the differences and interrelationships between member, subassemblage, and system performance. The resulting plan includes a summary of tasks for conducting both experimental and analytical research, and is intended to be the first step in the development of national consensus guidelines for designing and assessing the seismic performance of deep, slender wide-flange beam-columns in steel frame systems.

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.

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.

Download or read book Proceedings of the 11th International Conference on Behaviour of Steel Structures in Seismic Areas written by Federico M. Mazzolani and published by Springer Nature. This book was released on with total page 1192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Performance of Wide Flange Beam to Deep column Moment Connections written by Xiaofeng Zhang and published by . This book was released on 2004 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt: The behavior of the test specimens indicates that an RBS connection with a floor slab or a supplemental lateral brace at the RBS has good inelastic cyclic performance. The performance of the test specimens meet the requirements for seismic use that are stipulated in Appendix S of the 2002 AISC Seismic Provisions.

Download or read book Seismic Behavior of Unreinforced Steel Beam to column Moment Connections written by Areg Margarian and published by . This book was released on 2002 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Seismic Performance of Composite Beam columns written by Shannon D. Paboojian and published by . This book was released on 1993 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "An experimental study was undertaken to investigate the cyclic strength and ductility of composite columns subjected to simulatedseismic loading conditions. Eight two-thirds scale specimens were tested, each consisting of a structural steel shape encased in reinforcedconcrete. Parameters studied in the test program included: the degree of concrete confinement required to achieve adequate ductility; the effectiveness of shear studs for developing flexural stiffness and capacity under combined loading; the distribution of transverse shear resistance among the elements of the composite column; and concrete compressive strength. The results of the test program indicate that composite columns possess exceptional ductility and strength under cyclic loading if the buckling of longitudinal reinforcement is inhibited. Furthermore, the steel shape provides the primary resistance to transverse shear during overloading, and shear studs are not effective in enhancing the resistance against lateral loading. The elastic secant stiffness of the composite section corresponding to initial yielding of the longitudinal reinforcement was found to be well approximated by using one-half the gross moment of inertia (0.5I[subscript g]) in conjunction with Young's modulus for concrete. A prediction method based on superimposing the individual strengths of the reinforced concrete and structural steel shape was found to provide good agreement with test results. Current AISC LRFD provisions were determined to grossly underestimate the flexural capacity of the test specimens, which were axially loaded to 20% of their nominal pure axial load capacity [sic]."

Download or read book Proceedings of the 10th International Conference on Behaviour of Steel Structures in Seismic Areas written by Federico M. Mazzolani and published by Springer Nature. This book was released on 2022-05-07 with total page 1146 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume highlights the latest advances, innovations, and applications in the field of seismic design and performance of steel structures, as presented by leading international researchers and engineers at the 10th International Conference on the Behaviour of Steel Structures in Seismic Areas (STESSA), held in Timisoara, Romania, on 25-27 May 2022. It covers a diverse range of topics such as behaviour of structural members and connections, performance of structural systems, mixed and composite structures, energy dissipation systems, self-centring and low-damage systems, assessment and retrofitting, codes and standards, light-gauge systems. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster multidisciplinary collaboration among different specialists.

Download or read book Seismic Behavior of Concrete Filled Tube Column wide Flange Beam Frames written by Ricardo Herrera and published by . This book was released on 2005 with total page 1484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the results from the analytical and experimental studies, CFT-MRFs can be successfully applied to seismic resistant design and their behavior can be studied using the analytical model developed in this study.

Download or read book Further Studies on Seismic Behavior of Steel Beam to column Subassemblages written by Vitelmo Victorio Bertero and published by . This book was released on 1973 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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:

Download or read book Experimental Evaluation of Steel Wide flange Columns in Moment resisting Frames Under High Axial Load and Lateral Drift Demands written by Julien Cravero and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Steel moment-resisting frames (MRFs) in seismic regions are designed to concentrate yielding in beams to dissipate the energy released by earthquakes. However, capacity design procedures in North American code provisions (CSA 2009; AISC 2010a) do not systematically prevent plastic deformations from occurring in columns. Under ground motions with a low probability of occurrence, steel columns as part of MRFs may develop plastic hinges which can lead to undesirable frame mechanisms. Due to a limited set of test data, the current modelling guidelines (PEER/ATC 2010; ASCE 2014) provide little guidance and often employ highly conservative component models for nonlinear modelling of steel columns. Thus, ASCE 41-13 (ASCE 2014) considers that a column possesses no plastic rotation capacity when the compressive axial load demands become larger than 50% of the critical load associated with the member. Hence, the seismic behaviour of steel columns needs to be characterized experimentally, in particular for high axial load and lateral drift demands. High axial load demands on columns are common in existing steel frame buildings due to gravity and can be increased by vertical accelerations and/or dynamic overturning effects in the case of end columns. This thesis intends to advance the state of knowledge on the hysteretic behaviour of steel columns with a large-scale testing program. Twelve column specimens utilizing W14 and W16 cross-sections that are typically used in steel MRFs are subjected to diverse axial and lateral loading sequences. Monotonic, symmetric and collapse-consistent loading histories are employed to push the columns far into the inelastic range and to assess their performance until collapse (i.e., point of loss of axial load carrying capacity). The transient effect on end columns within MRFs is also studied. Test results provide unique experimental data characterizing the cyclic behaviour of steel columns through the loss of their axial load carrying capacity. The effect of the local slenderness, the cross-section depth, the applied axial load ratio, the loading history and the steel material on the column performance is discussed. Moreover, test data are compared with pre-test simulation predictions carried out with a continuum finite element and a concentrated plasticity model.The thesis provides valuable insights on column performance under a wide range of seismic inputs, the interaction of axial load and lateral drift demands, strength and stiffness deterioration phenomena occurring at the component level and a failure mode associated with column axial shortening. In particular, experimental results show that all the tested column specimens exhibit an appreciable plastic rotation capacity even when subjected to high axial load demands. These results can serve to refine seismic design code provisions, revisit guidelines for the nonlinear analysis of steel columns and calibrate numerical models, on the basis of the proposed recommendations." --

Download or read book Recommended Seismic Design Criteria for New Steel Moment Frame Buildings FEMA 350 written by Federal Emergency Agency and published by FEMA. This book was released on 2013-03-16 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

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