Single-Span Deep Beams Subjected to Unsymmetrical Loads
Author: Ning Zhang1, Kang-Hai Tan and Chee-Lai Leong | Size: 1.4 MB | Format:PDF | Quality:Unspecified | Publisher: ASCE | Year: 2009 | pages: 14
This paper investigates the effects of unsymmetrical loadings on the strength and behavior of simply supported deep beams.
An experimental program consisting of 14 specimens has been carried out. Test results including crack patterns, load-deflection responses,
steel and concrete strains, and failure loads are presented and discussed with the effects of load inequality LI and load asymmetry LA.
Conclusions are drawn on the effects of LI and LA on deep beam behavior. The ACI 318-05 strut-and-tie method is found to slightly
overestimate the beam shear capacity. The writers proposed a direct strut-and-tie method STM for predicting the failure loads of
unsymmetrically loaded deep beams. By adopting an interactive failure criterion, no preset empirical stress limit is required in the model.
A load parameter is introduced such that the proposed STM can simulate both the effects of LI and LA. It is shown that the proposed
STM is a generalized form that embodies the special cases of single-point and two-equal-point symmetric loading conditions. Besides, the
model gives promising results in predicting the possible failure modes. The STM predictions are in good agreement with test results as
well as finite-element predictions of 14 specimens.
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Direct Strut-and-Tie Model for Prestressed Deep Beams
Author: K. H. Tan, K. Tong and C. Y. Tang | Size: 169 KB | Format:PDF | Quality:Unspecified | Publisher: ASCE | Year: 2001 | pages: 9
The strut-and-tie method is a promising analytical tool for the design of disturbed regions where
the conventional plane bending theory does not hold. These include pile caps, corbels, frame joints, deep beams,
and so forth. This paper focuses on the application of a strut-and-tie model to prestressed deep beams. A simple
and direct model is proposed, taking the prestressing effect into consideration. The model can be used for both
pre- and posttensioned deep beams. Different configurations of web reinforcement can also be properly modeled
in the proposed approach. A comparison shows that the predictions are in good agreement with experimental
results of four case studies of 39 beams.
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Bentley Systems, Incorporated, the leading company dedicated to providing comprehensive software solutions for sustaining infrastructure, announced the release of MXROAD V8i (SELECTseries 3) and the forthcoming SELECTseries 3 releases of its country-specific PowerCivil products throughout 2013. All of the products now share the powerful and unifying capabilities of Bentley’s OpenRoads technology, advancing through information modeling for multi-disciplinary roadway teams “BIM” objectives such as better design decisions, increased construction awareness, and interoperability for asset management.
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This advanced and graduate-level text and self-tutorial teaches readers to understand and to apply analytical design principles across the breadth of the engineering sciences. Emphasizing fundamentals, the book addresses the stability of key engineering elements such as rigid-body assemblage, beam-column, beam, rigid frame, thin plate, arch, ring, and shell. Each chapter contains numerous worked-out problems that clarify practical application and aid comprehension of the basics of stability theory, plus end-of-chapter review exercises. Others key features are the citing and comparison of different national building standards, use of non-dimensional parameters, and many tables with much practical data and simplified formula, that enable readers to use them in the design of structural components. First six chapters most suitable for undergraduate-level study and remaining chapters for graduate-level courses.
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This advanced and graduate-level text and self-tutorial teaches readers to understand and to apply analytical design principles across the breadth of the engineering sciences. Emphasizing fundamentals, the book addresses the stability of key engineering elements such as rigid-body assemblage, beam-column, beam, rigid frame, thin plate, arch, ring, and shell. Each chapter contains numerous worked-out problems that clarify practical application and aid comprehension of the basics of stability theory, plus end-of-chapter review exercises. Others key features are the citing and comparison of different national building standards, use of non-dimensional parameters, and many tables with much practical data and simplified formula, that enable readers to use them in the design of structural components. First six chapters most suitable for undergraduate-level study and remaining chapters for graduate-level courses.
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- Presents concepts, methods and techniques to examine symptoms of faults and failures of structures, systems and components and to monitor functional performance and structural integrity;
- Integrates knowledge of basic sciences and engineering disciplines with contributions from research institutions, academy, and industry;
- Written by a team of internationally known experts in the field;
This book presents concepts, methods and techniques to examine symptoms of faults and failures of structures, systems and components and to monitor functional performance and structural integrity. The book is organized in five parts. Part A introduces the scope and application of technical diagnostics and gives a comprehensive overview of the physics of failure. Part B presents all relevant methods and techniques for diagnostics and monitoring: from stress, strain, vibration analysis, nondestructive evaluation, thermography and industrial radiology to computed tomography and subsurface microstructural analysis. Part C cores the principles and concepts of technical failure analysis, illustrates case studies, and outlines machinery diagnostics with an emphasis on tribological systems. Part D describes the application of structural health monitoring and performance control to plants and the technical infrastructure, including buildings, bridges, pipelines, electric power stations, offshore wind structures, and railway systems. And finally, Part E is an excursion on diagnostics in arts and culture. The book integrates knowledge of basic sciences and engineering disciplines with contributions from research institutions, academe, and industry, written by internationally known experts from various parts of the world, including Europe, Canada, India, Japan, and USA.
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Computational Plasticity with Emphasis on the Application of the Unified Strength Theory” explores a new and important branch of computational mechanics and is the third book in a plasticity series published by Springer. The other two are: Generalized Plasticity, Springer: Berlin, 2006; and Structural Plasticity, Springer and Zhejiang University Press: Hangzhou, 2009. This monograph describes the unified strength theory and associated flow rule, the implementation of these basic theories in computational programs, and shows how a series of results can be obtained by using them. The unified strength theory has been implemented in several special nonlinear finite-element programs and commercial Finite Element Codes by individual users and corporations. Many new and interesting findings for beams, plates, underground caves, excavations, strip foundations, circular foundations, slop, underground structures of hydraulic power stations, pumped-storage power stations, underground mining, high-velocity penetration of concrete structures, ancient structures, and rocket components, along with relevant computational results, are presented. This book is intended for graduate students, researchers and engineers working in solid mechanics, engineering and materials science. The theories and methods provided in this book can also be used for other computer codes and different structures. More results can be obtained, which put the potential strength of the material to better use, thus offering material-saving and energy-saving solutions
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Abstract: A numerical study is presented on the kinematic response of groups of floating piles connected through rigid massless caps and subjected to vertically-propagating harmonic S waves. Pile-soil and pile-pile interaction effects are modeled rigorously. Parametric results for the effective seismic input motion at the pile cap, normalized by the free-field ground-surface motion, are displayed in dimensionless form for a number of typical pile-group configurations, in three idealized soil profiles. Pile-head fixity conditions and the pile/soil modulus ratio are found to affect the seismic response of both single piles and pile groups. The presented results can be utilized in assessing the influence of piles on the effective seismic excitation at the base of a structure.
- Unique approach to the subject
- One-stop resource
- With practical applications
The subject of mechanical behavior has been in the front line of basic studies in engineering curricula for many years. This textbook was written for engineering students with the aim of presenting, in a relatively simple manner, the basic concepts of mechanical behavior in solid materials. A second aim of the book is to guide students in their laboratory experiments by helping them to understand their observations in parallel with the lectures of their various courses; therefore the first chapter of the book is devoted to mechanical testing. Another aim of the book is to provide practicing engineers with basic help to bridge the gap of time that has passed from their graduation up to their actual involvement in engineering work.
The book also serves as the basis for more advanced studies and seminars when pursuing courses on a graduate level.
The content of this textbook and the topics discussed correspond to courses that are usually taught in universities and colleges all over the world, but with a different and more modern approach. It is however unique by the inclusion of an extensive chapter on mechanical behavior in the micron and submicron/nanometer range. Mechanical deformation phenomena are explained and often related to the presence of dislocations in structures. Many practical illustrations are provided representing various observations encountered in actual structures of particularly technical significance. A comprehensive list of references at the end of each chapter is included to provide a broad basis for further studying the subject.
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