A DISPLACEMENT-BASED ADAPTIVE PUSHOVER ALGORITHM FOR ASSESSMENT OF VERTICALLY IRREGULAR FRAMES
Author: RUI PINHO ; STELIOS ANTONIOU | Size: 259 KB | Format:PDF | Quality:Unspecified | Publisher: 4th European Workshop on the Seismic Behaviour of Irregular and Complex Structures Thessaloniki, Greece, 26–27 August 2005 | Year: 2005 | pages: 16
Due to the unvarying nature of the applied displacement loading vector, conventional (nonadaptive) displacement-based pushover analysis can conceal important structural characteristics, such as strength irregularities and soft storeys, should the displacement pattern adopted at the start of the analysis not correspond to the structure’s post-yield failure mechanism. Consequently, when only non-adaptive static nonlinear analysis tools are available, as has been the case throughout the past, force-based pushover does constitute a preferable choice over its displacement-based counterpart. On the other hand, however, if one
is able to apply displacements, rather than forces, in an adaptive fashion, that is, with the
possibility of updating the displacement loading pattern according to the structural properties of the model at each step of the analysis, then a conceptually appealing deformation-based nonlinear static analysis tool would be obtained. The present study focuses therefore on the
verification of the accuracy of such an innovative displacement-based adaptive pushover method (DAP), to estimate the response characteristics of vertically irregular frames subjected
to earthquake excitation.
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A series of pushover analyses on two-dimensional RC frames, part of an office building, are
performed. They constitute a detailed parametric study, varying the number of stories and its height, and also
the bay width. Regarding the stated objective, several commercial packages universally used in the design of
civil engineering structures were used, namely SAP 2000, SeismoStruct and MIDAS. To represent the
influence of the masonry infill panels, the equivalent tie method is used considering several values for the tie
width. The influence of other parameters, on the structural behavior of the RC frame through a pushover
analysis, is also analyzed: the confinement of the structural elements (columns and beams) and the length and
location of the plastic hinges forming near the end of the structural elements. Finally, it is also parameterized
the behavior of the structure when submitted to different load patterns, such as: uniform and modal, as
suggested in the Eurocode8, and triangular. Major conclusions of the study elaborated are presented and
future developments are pointed-out in order to deepen the pushover analysis of two dimensional RC frames.
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Autodesk Inc., a world leader in 3D design software for entertainment, natural resources, manufacturing, engineering, construction, and civil infrastructure, announced the release of Robot Structural Analysis 2015, is a complements building information (BIM) with coordinated digital analysis and design for structural engineers.
Autodesk Robot Structural Analysis Professional software provides structural engineers with advanced structural analysis capabilities for even large and complex structures. Analyze models with powerful finite element auto-meshing, nonlinear algorithms, and a comprehensive library of country-specific design codes.
Autodesk Robot Structural Analysis Professional is faster and more flexible enabling structural analysis to be performed more quickly and easily. The software supports smoother workflow and interoperability with Autodesk Revit Structure software, the Autodesk structural engineering building information modeling (BIM) solution. The software's open API (application programming interface) enables design and analysis capabilities to be extended to other Autodesk software solutions and third party software.
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Provides comprehensive and up-to-date information about hydrologic time series analysis
Covers all important aspects of hydrologic time series analysis along with salient case studies demonstrating the use of time series analysis in different areas of hydrology
All the chapters contain necessary details about the topics discussed, are presented in a rational way for a systematic and effective reading, and written in an easy-to-understand language
There is a dearth of relevant books dealing with both theory and application of time series analysis techniques, particularly in the field of water resources engineering. Therefore, many hydrologists and hydrogeologists face difficulties in adopting time series analysis as one of the tools for their research. This book fills this gap by providing a proper blend of theoretical and practical aspects of time sereies analysis. It deals with a comprehensive overview of time series characteristics in hydrology/water resources engineering, various tools and techniques for analyzing time series data, theoretical details of 31 available statistical tests along with detailed procedures for applying them to real-world time series data, theory and methodology of stochastic modelling, and current status of time series analysis in hydrological sciences. In adition, it demonstrates the application of most time series tests through a case study as well as presents a comparative performance evaluation of various time series tests, together with four invited case studies from India and abroad.
This book will not only serve as a textbook for the students and teachers in water resources engineering but will also serve as the most comprehensive reference to educate researchers/scientists about the theory and practice of time series analysis in hydrological sciences. This book will be very useful to the students, researchers, teachers and professionals involved in water resources, hydrology, ecology, climate change, earth science, and environmental studies.
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This book comprehensively accounts the advances in data-based approaches for hydrologic modeling and forecasting. Eight major and most popular approaches are selected, with a chapter for each -- stochastic methods, parameter estimation techniques, scaling and fractal methods, remote sensing, artificial neural networks, evolutionary computing, wavelets, and nonlinear dynamics and chaos methods.
These approaches are chosen to address a wide range of hydrologic system characteristics, processes, and the associated problems. Each of these eight approaches includes a comprehensive review of the fundamental concepts, their applications in hydrology, and a discussion on potential future directions.
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Gourley, J.T. and Johnson, G.B., “Developments in Geopolymer Precast Concrete”, Proceedings of the International Workshop on Geopolymers and Geopolymer Concrete, Perth, Australia, 2005.
Author: S.S. Ray, J. Barr, L. Clark | Size: 6.2 MB | Format:PDF | Quality:Unspecified | Year: 1996 | pages: 162 | ISBN: 0860174409
This work guides bridge designers, working for either the owner or a constructor, on how to improve the buildability of common highway bridge structures. Checklists of actions provide a reminder of "conceptual" and "specific" issues related to design for buildability and can be extended to suit individual projects.
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Series on Stability, Vibration and Control of Systems, Series A, Volume 5> Presents the idea of zero-range potentials and shows the limitations of the point models used in structural mechanics. Offers specific examples from the theory of generalized functions, regularization of super-singular integral equations and other specifics of the boundary value problems.
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Details the effects of light spectrum
Organizes lighting requirements from the perspective of driving tasks rather than technology
Incorporates a coherent philosophy for lighting based on the supply of visual information
Provides a review of the latest findings on the most effective use of lighting for road safety
Examines future trends in road, signal, and vehicle lighting
Summary:
Integrates Vehicle, Signal, and Road Lighting into a Unified System
Many people drive many miles after dark and rely on lighting to help them gather information about the road ahead and the presence and intentions of other people on and near the road. With new technology on the industry’s horizon, Lighting for Driving: Roads, Vehicle, Signs and Signals conveys the crucial role lighting plays in road safety and examines how it could be used more effectively.
Authored by a lighting and visibility expert, this book explains the thinking and scientific reasoning behind various forms of lighting and analyzes their contribution to the driver’s understanding of real and potential road hazards. Filled with useful information, this resource straightforwardly addresses a wide range of safety factors encountered in real driving situations, such as weather conditions, complex signage, and driver age. It also deals with the often-ignored consequences of too much light, such as light trespass and sky glow.
Comprehensively Explores the Field, Emphasizing Improved Safety
Vehicle, road, sign, and signal lighting are provided to enable drivers to reach their destinations quickly and safely. However, the attention given to how these forms of lighting function is likely to change as new technology is introduced and understanding of ergonomics and human factors improves. This book effectively illustrates how these forms of lighting can be modified to work together to best provide a coherent flow of information to the driver.
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