Seismic behavior of box girder cable-stayed bridges considering large deformations
Author: Halabian, Amir M.; Keshtegar, Behrouz; Hashemolhosseini, S. Hamid | Size: 440 KB | Format:PDF | Quality:Unspecified | Publisher: NISEE e-Library | Year: 2007 | pages: 9
The main purpose of this study is to consider large deformations of the deck in response of long-span cable-stayed bridges during seismic excitations taking into account both kinds of geometric and material non-linearities. A 3D finite element model was developed. Large deformation beam elements with very low bending stiffness were used to model main supporting cables. The orthotropic deck was represented in the model with large deformation shell elements. Non-linear time history analyses using explicit approach were performed for a practical cable-stayed bridge subjected to different ground excitations considering ground motion spatial variation. In a parametric study the effects of the spatial variation in ground motions and cablesβ post-tensioned forces on seismic response of the structure were examined. Results of time history analyses indicated that neglecting large deformations could lead one to overestimate the stiffness of the deck in some areas.
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Vulnerability, Uncertainty, and Risk: Analysis, Modeling, and Management
Author: Bilal M. Ayyub | Size: 40.1 MB | Format:PDF | Quality:Unspecified | Publisher: American Society of Civil Engineers | Year: 2011 | pages: 1004 | ISBN: 9780784411704
Proceedings of the International Conference on Vulnerability and Risk Analysis and Management (ICVRAM 2011) and the International Symposium on Uncertainty Modeling and Analysis (ISUMA 2011), held in Hyattsville, Maryland, April 11-13, 2011. Sponsored by the Council on Disaster Risk Management of ASCE. This collection contains 120 peer-reviewed papers that build upon recent significant advances in the modeling, analysis, and management of risk, vulnerability, and uncertainty. Yet, even as advancements are made in technology, new hazards appear. These papers demonstrate the transformation of intellectual discussions into robust frameworks for handling emerging vulnerabilities and risks and providing analytical bases to prepare for national and international disasters
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In this revised second edition, Elements of Plasticity continues to bridge the gap between classical theory and modern computational techniques and does so by focusing on the most important elements of theory and computation using matrix notation. Some complementary aspects of creep and viscoplasticity are considered and a number of applications from engineering practice are used to demonstrate the use of computational techniques. Practicing engineers, consultants and graduate students from civil, mechanical, automotive and aerospace engineering will find this revised edition indispensable.
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The most common terminals for tankers are sea islands and piers; however, many other shipboard operations such as mooring at Single Point Moorings (SPM's), Multi-Buoy Moorings (MBM's), emergency towing, barge mooring, tug handling, anchoring, canal transit may fall into the category of mooring and thus require specialized equipment or fittings.
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Abstract
Bridge girders exposed to aggressive environmental conditions are subject to time-variant changes in resistance. There is therefore a need for evaluation procedures that produce accurate predictions of the load-carrying capacity and reliability of bridge structures to allow rational decisions to be made about repair, rehabilitation and expected life-cycle costs. This study deals with the stability of damaged steel I-beams with web opening subjected to bending loads. A three-dimensional (3D) finite element (FE) model using ABAQUS for the elastic flexural torsional analysis of I-beams has been used to assess the effect of web opening on the lateral buckling moment capacity. Artificial neural network (ANN) approach has been also employed to derive empirical formulae for predicting the lateral-torsional buckling moment capacity of deteriorated steel I-beams with different sizes of rectangular web opening using obtained FE results. It is found out that the proposed formulae can accurately predict residual lateral buckling capacities of doubly-symmetric steel I-beams with rectangular web opening. Hence, the results of this study can be used for better prediction of buckling life of web opening of steel beams by practice engineers.
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Author: by Richard A. Davis, Jr., Robert W. Dalrymple | Size: 50 MB | Format:PDF | Quality:Unspecified | Publisher: SΡringΠ΅r SΡiBus | Year: 2012 | pages: 638 | ISBN: 9400701225 9789400701229 9789400701236
This book presents a comprehensive, contemporary review of tidal environments and deposits, overview of tidal sedimentology. The approach is comprehensive with state-of-the-art reviews of the full spectrum of tidal depositional environments, from supratidal salt marshes, through the full range of coastal environments and continental shelves, to the deep sea.
Examples from modern environments and ancient deposits are provided, and both siliciclastic and carbonate environments are discussed.
The book is organized in the following four parts.
1) Chapters 1 β 4 provide overviews of the fundamentals of: the generation of tides, the nature of sediment transport by tidal currents, the criteria by which tidal deposits can be recognized, and the ichnology of tidal deposits.
2) Chapters 5 β 14 review the charac teristics of the full range of siliciclastic tidal environments, including both tide-dominated estuaries and deltas, as well as the various tidal components of barrier-lagoon systems. These chapters cover all aspects of the sedimentology of these environments, from the details of the physical processes operating in them, through the morphodynamics and facies, and the stratigraphic organization of the deposits.
3) Chapters 15 β 18 provide syntheses of particular times and places in earth history where tidal deposits are particularly notable.
4) Chapters 19 β 21 discuss tidal sedimentation in modern and ancient carbonate environments.
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