Experimental and Analytical Studies of Full-scale Pre-Northridge Steel Moment Connections Under Dynamic Loading PDF Download

Author: Qi-Song Yu
Publisher:
ISBN:
Category : Earthquake resistant design
Languages : en
Pages : 186

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Author: Qi-Song Yu
Publisher:
ISBN:
Category :
Languages : en
Pages : 634

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Author: Qisong Yu
Publisher:
ISBN:
Category : Composite construction
Languages : en
Pages : 354

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Author: Sungyeob Shin
Publisher:
ISBN:
Category :
Languages : en
Pages : 844

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Book Description
Steel moment resisting frames (MRFs) are one of the most commonly used lateral force resisting system for steel building construction located in regions of high seismic risk. Although steel moment frames were studied extensively following the 1994 Northridge Earthquake, one critical design issue is not yet completely understood: the role of the panel zone. Recent U.S. building codes have significantly increased the required shear strength of the panel zone for seismic applications. This leads to increased column sizes or the need for costly doubler plates. A number of past research studies showed that shear yielding of panel zones results in highly ductile behavior and provides a major contribution to frame deformation as an excellent source of energy dissipation. However, these same studies suggested that large panel zone shear deformation can cause high strain concentrations near the beam flange groove welds and can cause premature fracture at the joint. The overall goal of this research is to provide additional data to help answer the question: how much panel zone participation should be permitted in the inelastic seismic response of a steel moment frame? Despite a number of past studies on this issue, there are sharply conflicting views of how panel zones should be treated in design, both within the research community as well as within the building regulatory community. At the crux of the disagreements are concerns regarding fracture induced by panel zone yielding. There appears to be broad agreement that panel zone yielding is a highly ductile process. However, there is broad disagreement on the role that panel zone yielding plays in joint fracture. While there have been a number of past experimental studies on moment frame subassemblies with weak panel zones, the availability of data on large-scale specimens constructed using current US connection detailing and welding practices is very scarce. Further, the experimental database lacks critical data on panel zone behavior in deep columns and for columns subjected to significant axial forces. The primary focus of this dissertation is to provide much needed large-scale experimental data on the cyclic loading performance of steel moment frame joints with weak panel zones. The experimental study was supplemented by finite element analysis of the test specimens, intended to provide additional insights into the response of the test specimens. Cyclic loading tests were conducted on ten large-scale interior steel moment connections to study the seismic performance of the connections. The key variables for the tests were: panel zone strength; beam and column size; beam-to-column connection detail; and column axial stress. Nine of the ten test specimens performed well and met the acceptance criteria of 0.04 radian story drift angle for special moment frames in the current AISC Seismic Provisions. One specimen failed by fracture of the column flange just prior to achieving 0.04 radian story drift angle. In the experimental program, the weak panel zone specimens showed excellent performance, developing drift capacities as large as or larger than the strong panel zone specimens. The weak panel zone specimens exhibited less beam buckling and therefore less strength degradation than the strong panel zone specimens. Shear yielding of the panel zones in these specimens showed highly ductile behavior with stable hysteretic loops. The panel zone was an excellent energy dissipater. The results of this test program showed that acceptable performance of moment frame joints can be achieved over a range of panel zone strengths, varying from very weak to very strong. The experimental results also show that joints with weak panel zones can achieve very large inter-story drift angles prior to fracture. These experimental results suggest that current U.S. code requirements for panel zone strength merit reevaluation. Finite element models were developed of the test specimens, including a global model using shell elements and a local joint model using solid elements. The overall load deflection response of the test specimens predicted by the global models showed good agreement with the experimental results. Local joint models were developed to examine the potential for ductile fracture initiation using the Rupture Index. These studies suggested that the weak panel zone specimens should be far more prone to fracture than the strong panel zone specimens. This prediction, however, was inconsistent with the experimental observations. This suggest that using the Rupture Index as an indicator of the potential for ductile fracture initiation when comparing differing moment frame joint design options, as has been done by previous researchers, should be approached with caution.

Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 806

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Author: Krishna B. Misra
Publisher: Springer Nature
ISBN: 3030557324
Category : Technology & Engineering
Languages : en
Pages : 811

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Book Description
This book considers all aspects of performability engineering, providing a holistic view of the activities associated with a product throughout its entire life cycle of the product, as well as the cost of minimizing the environmental impact at each stage, while maximizing the performance. Building on the editor's previous Handbook of Performability Engineering, it explains how performability engineering provides us with a framework to consider both dependability and sustainability in the optimal design of products, systems and services, and explores the role of performability in energy and waste minimization, raw material selection, increased production volume, and many other areas of engineering and production. The book discusses a range of new ideas, concepts, disciplines, and applications in performability, including smart manufacturing and Industry 4.0; cyber-physical systems and artificial intelligence; digital transformation of railways; and asset management. Given its broad scope, it will appeal to researchers, academics, industrial practitioners and postgraduate students involved in manufacturing, engineering, and system and product development.

Author: Walter G. Reuter
Publisher: ASTM International
ISBN: 0803128991
Category :
Languages : en
Pages : 778

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Book Description
Covering the whole of Asia and the Pacific region, this text provides both an analytic overview and specific data for each of the 60 countries. Introductory chapters cover regional issues, including: a regional review with the year's trends, developments and key events' analysis of the threat of terrorism in the region; the effects of deflation on the economy; the water crisis and its impact on the poor; and the successes and failures of micro-credit in the region.

Author: M. Anson
Publisher: Elsevier
ISBN: 0080526632
Category : Technology & Engineering
Languages : en
Pages : 1844

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Book Description
This set of proceedings is based on the International Conference on Advances in Building Technology in Hong Kong on 4-6 December 2002. The two volumes of proceedings contain 9 invited keynote papers, 72 papers delivered by 11 teams , and 133 contributed papers from over 20 countries around the world. The papers cover a wide spectrum of topics across the three technology sub-themes of structures and construction, environment, and information technology. The variety within these categories spans a width of topics, and these proceedings provide readers with a good general overview of recent advances in building research.

Author: Yousef Bozorgnia
Publisher: CRC Press
ISBN: 0203486242
Category : Technology & Engineering
Languages : en
Pages : 958

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Book Description
This multi-contributor book provides comprehensive coverage of earthquake engineering problems, an overview of traditional methods, and the scientific background on recent developments. It discusses computer methods on structural analysis and provides access to the recent design methodologies and serves as a reference for both professionals and res

Author:
Publisher:
ISBN:
Category : Earthquake engineering
Languages : en
Pages : 454

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