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Book Storey based Stability Analysis for Multi storey Unbraced Frames Subjected to Variable Loading

Download or read book Storey based Stability Analysis for Multi storey Unbraced Frames Subjected to Variable Loading written by Xiaohong Wang and published by . This book was released on 2008 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: For decades, structural engineers have been using various conventional design approaches for assessing the strength and stability of framed structures for various loads. Today, engineers are still designing without some critical information to insure that their stability assessment yields a safe design for the life of the structure with consideration for extreme loads. Presented in this thesis is new critical information provided from the study of stability analysis and design of steel framed structures accounting for extreme loads associated to load patterns that may be experienced during their lifetime. It is conducted in five main parts. A literature survey is first carried out reviewing the previous research of analyzing frame stability including the consideration of initial geometric imperfections, and also evaluating research of the analysis and design of the increased usage of cold-formed steel (CFS) storage racks. Secondly, the elastic buckling loads for single-storey unbraced steel frames subjected to variable loading is extended to multi-storey unbraced steel frames. The formulations and procedures are developed for the multi-storey unbraced steel frames subjected to variable loading using the storey-based buckling method. Numerical examples are presented as comparisons to the conventional proportional loading approach and to demonstrate the effect of connection rigidity on the maximum and minimum frame-buckling loads. Thirdly, the lateral stiffness of axially loaded columns in unbraced frames accounting for initial geometric imperfections is derived based on the storey-based buckling. A practical method of evaluating column effective length factor with explicit accounting for the initial geometric imperfections is developed and examined using numerical examples. The fourth part is an investigation of the stability for multi-storey unbraced steel frames under variable loading with accounting for initial geometric imperfections. Finally, the stability of CFS storage racks is studied. The effective length factor of CFS storage racks with accounting for the semi-rigid nature of the beam-to-column connections of such structures are evaluated based on experimental data. A parametric study on maximum and minimum frame-buckling loads with or without accounting for initial geometric imperfections is conducted. The proposed stability analysis of multi-storey unbraced frames subjected to variable loading takes into consideration the volatility of live loads during the life span of structures and frame buckling characteristics of the frames under any possible load pattern. From the proposed method, the maximum and minimum frame-buckling loads together with their associated load patterns provides critical information to clearly define the stability capacities of frames under extreme loads. This critical information in concern for the stability of structures is generally not available through a conventional proportional loading analysis. This study of work ends with an appropriate set of conclusions.

Book The Storey Based Stability of Steel Frames Subjected to Variable Gravity and Fire Loading

Download or read book The Storey Based Stability of Steel Frames Subjected to Variable Gravity and Fire Loading written by Terence Ma and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of storey-based stability has been developed over the past several decades, and includes powerful methods to holistically assess the structural integrity of unbraced and semi-braced steel frames. Recently, it has also been applied in variable loading analysis, which unlike traditional proportional loading analysis, aims to determine the worst and best case scenarios of loading which will cause the instability of any such frame. Presented in this thesis are a number of theoretical and analytical methods which extend the field of applicability of the storey-based stability and variable loading analysis concepts, particularly towards the direction of performance-based fire-structural analysis. As building fires commonly occur and are responsible for significant losses of property and life across the world, it is of fundamental importance for structural engineers to understand and design against the instability of a structure subjected to fire conditions. In this study, the concept of storey-based stability analysis is first extended to account for shear and axial deformations in members of the frames. Although these effects are often neglected in traditional structural stability analysis, they may become significant in some cases. The effects of column initial imperfections and lateral loads on the deformations and related failure criteria of a frames are also considered. With these concepts in mind, the storey-based analysis approach is then extended to account for elevated temperatures and various fire scenarios, and the concept of variable loading is extended to consider variable fire and temperature loading instead of gravity loading. The complexity of the problem is then further heightened by considering the presence of stepped members in a frame resulting from longitudinal temperature gradients. Most especially, the post-earthquake fire situation is considered by modelling the damages to both the structure and insulation before applying the appropriate stability analysis equations. The post-earthquake fire scenario deserves special attention since large-scale conflagrations can potentially follow earthquakes during which extinguishing measures are rendered unavailable. Finally, the extension of the storey-based stability and variable gravity loading concepts towards multiple storey frames is achieved in this study, with the capabilities of considering all of the aforementioned conditions. The proposed methods contained in this study provide a comprehensive and robust toolset for holistically evaluating the stability and deformations of structures by considering them as structural systems rather than individual members. As necessary, the use of finite element modelling is used to validate the theoretical accuracy of all of the proposed methods. Finally, some recommendations for further research are proposed with aims to further extend the fields of storey-based stability and variable loading.

Book Storey based Stability Analysis of Unbraced Steel Frames at Ambient and Elevated Temperatures

Download or read book Storey based Stability Analysis of Unbraced Steel Frames at Ambient and Elevated Temperatures written by Yi Zhuang and published by . This book was released on 2013 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fundamental task in structural stability analysis is to ensure the safety of structures throughout their operational life so as to prevent catastrophic consequences either at ambient or elevated temperatures. This thesis concerns the stability of unbraced steel frames due to abnormal loadings or fire loads, and develops practical methods to evaluate the stability capacity of unbraced steel frames at ambient temperature or in fire.

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1984 with total page 1104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The General Behavior and Strength of Unbraced Multi story Frames Under Gravity Loading

Download or read book The General Behavior and Strength of Unbraced Multi story Frames Under Gravity Loading written by Bernard Michael McNamee and published by . This book was released on 1967 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The inelastic behavior of symmetrical multi-story frames under symmetrical gravity loading is described. The present state of knowledge as to the analysis of these frames is outlined. A method to compute inelastic buckling loads for multi-story frames is proposed. The results of two multi-story frame buckling tests are presented. The test specimens are three-story, single-bay, pinned-base frames. Analytical studies are conducted to examine the effects on the frame buckling loads caused by varying the structural parameters. The frames in the studies are single-bay and multi-story. They are designed on a strength basis to fail at an ultimate load equal to the beam mechanism load. The changes in the frame buckling load caused by the primary bending moments are computed and are shown to be significant. The effects on the frame buckling load caused by varying the number of stories in a frame are evaluated. The beneficial effects of partial base fixity are examined. The rotational restraints provided by the lower stories on the top stories of multi-story frames are approximated and the corresponding frame buckling loads are obtained. (Author).

Book Comprehensive Dissertation Index

Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1973 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Effective Length and Notional Load Approaches for Assessing Frame Stability

Download or read book Effective Length and Notional Load Approaches for Assessing Frame Stability written by and published by Amer Society of Civil Engineers. This book was released on 1997-01-01 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides a thorough understanding of the assumptions with respect to column and frame stability made in the American Institute of Steel Construction (AISC) specifications and presents the derivation and use of one alternate approach that is in common use in some form within several other design standards. Of the three techniques for stability design discussed, two approaches are based on the use of effective length factors and the third method involves the use of a notional load approach. Examples are included to illustrate the procedures for both common and unusual conditions encountered in practice, along with discussions on the advantages and disadvantages of each of the methods. This report is applicable to both unbraced and braced frames having either fully-restrained or partially-restrained connections.

Book Irrigation Power Abstracts

Download or read book Irrigation Power Abstracts written by and published by . This book was released on 1974 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Handbook of Structural Engineering

Download or read book Handbook of Structural Engineering written by W.F. Chen and published by CRC Press. This book was released on 2005-02-28 with total page 1765 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing the best-selling tradition of the Handbook of Structural Engineering, this second edition is a comprehensive reference to the broad spectrum of structural engineering, encapsulating the theoretical, practical, and computational aspects of the field. The contributors cover traditional and innovative approaches to analysis, design, and rehabilitation. New topics include: fundamental theories of structural dynamics; advanced analysis; wind- and earthquake-resistant design; design of prestressed structures; high-performance steel, concrete, and fiber-reinforced polymers; semirigid frame structures; structural bracing; and structural design for fire safety.

Book U S Government Research Development Reports

Download or read book U S Government Research Development Reports written by and published by . This book was released on 1967 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Stability of Structures

Download or read book Stability of Structures written by Chai H Yoo and published by Elsevier. This book was released on 2011-05-12 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current trend of building more streamlined structures has made stability analysis a subject of extreme importance. It is mostly a safety issue because Stability loss could result in an unimaginable catastrophe. Written by two authors with a combined 80 years of professional and academic experience, the objective of Stability of Structures: Principles and Applications is to provide engineers and architects with a firm grasp of the fundamentals and principles that are essential to performing effective stability analysts. Concise and readable, this guide presents stability analysis within the context of elementary nonlinear flexural analysis, providing a strong foundation for incorporating theory into everyday practice. The first chapter introduces the buckling of columns. It begins with the linear elastic theory and proceeds to include the effects of large deformations and inelastic behavior. In Chapter 2 various approximate methods are illustrated along with the fundamentals of energy methods. The chapter concludes by introducing several special topics, some advanced, that are useful in understanding the physical resistance mechanisms and consistent and rigorous mathematical analysis. Chapters 3 and 4 cover buckling of beam-columns. Chapter 5 presents torsion in structures in some detail, which is one of the least well understood subjects in the entire spectrum of structural mechanics. Strictly speaking, torsion itself does not belong to a topic in structural stability, but needs to be covered to some extent for a better understanding of buckling accompanied with torsional behavior. Chapters 6 and 7 consider stability of framed structures in conjunction with torsional behavior of structures. Chapters 8 to 10 consider buckling of plate elements, cylindrical shells, and general shells. Although the book is primarily devoted to analysis, rudimentary design aspects are discussed. Balanced presentation for both theory and practice Well-blended contents covering elementary to advanced topics Detailed presentation of the development

Book Applied Mechanics Reviews

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1997 with total page 1060 pages. Available in PDF, EPUB and Kindle. Book excerpt: