Dr Wai-Fah Chen - a Chinese-born American academic and widely recognized structural engineering specialist in the field of mechanics, materials, and computing - has certainly led a fascinating life. A well-respected leader in the field of plasticity, structural stability, and structural steel design over the past half-century, he has made major contributions to introduce the mathematical theory of plasticity to civil engineering practice, especially in the application of limit analysis methods to the geotechnical engineering field.Having headed the engineering departments at the University of Hawaii and Purdue University, Chen is a widely cited author and the recipient of several national engineering awards, including the 1990 Shortridge Hardesty Award from the American Society of Civil Engineers and the 2003 Lifetime Achievement Award from the American Institute of Steel Construction. This book traces the life journey and reflections of Dr Chen. It presents a remarkable opportunity to understand his personal history and cultural passions: his struggle to achieve the American dream, his life as an eyewitness to the rise of China, and his career path to establish a solid engineering reputation. Presenting his scientific achievements spanning the last 40 years of his career, readers will thus be privy to his personal thoughts, experiences, and perspectives on these events.
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A key objective of the 19th NZGS symposium is to reduce human suffering due to a future natural disaster. For example, it is my personal observation and experience that “smart design”, which results in high levels of post-disaster key infrastructure functionality, is critical to minimise the adverse effects of major disasters on society, and, help to expedite the short-term emergency response and long-term recovery process.
Tony Fairclough,
Convenor
19th NZGS Symposium
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The aim of this book is to guide both new and experienced analysts on the use of finite element techniques to solve geotechnical problems.
Finite element analysis has been used within the realm of geotechnical engineering for some time. Universities and various specialist organisations now have experts in this field. More recently, however, there have been significant increases in the availability and affordability of computer power, and a proliferation of finite element packages that are relatively easy to use thus drastically reducing the learning curve for a novice user. This combined with the increased pressure for ever more efficient structures is leading to the use of finite element analysis becoming far more widespread.
This book is intended to be an introductory text for new users of the software, many of whom will fall into one of two groups. Those who have a wealth of geotechnical engineering experience, but are relative novices in the art of numerical analysis and “young engineers” who have recently graduated from University and have typically spent a short time since graduation performing linear static finite element analysis. Some basic geotechnical aspects have been described and a glossary summarising the geotechnical terms (shown in bold italics) used in this booklet has been included. However, non-geotechnical engineers are advised to refer to other texts for a more detailed description.
Potentially there is a dangerous consequence of software becoming too easy to use in that such packages may be used completely as a “black box” without some knowledge of the underlying mechanics. As such, it is recognised that a need to understand the principles of the finite element method is required to help analysts in converting a real world problem into a representative finite element model. The aim of this booklet is to fulfill that need. It is assumed that the reader understands a little Finite Element jargon, including the terms such as node, element etc. If this is not the case, the reader is strongly advised to refer to other booklets such as ‘How to get started with Finite Elements’, ‘How to model with Finite Elements’ and ‘How to understand Finite Element Jargon’.
4.59MB pdf
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Author: Carl Chatfield & Timothy Johnson D. | Size: 26 MB | Format:PDF | Quality:Unspecified | Publisher: Microsoft Press | Year: April 1, 2013 | pages: 578 | ISBN: 0735669112
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Article/eBook Full Name: Advanced Geotechnical Engineering: Soil-Structure Interaction using Computer and Material Models
Author(s): Chandrakant S. Desai, Musharraf Zaman
Edition: 1
Publish Date: 2013
ISBN: 1466515600, 978-1466515604
Published By: CRC Press
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Soil-structure interaction is an area of major importance in geotechnical engineering and geomechanics Advanced Geotechnical Engineering: Soil-Structure Interaction using Computer and Material Models covers computer and analytical methods for a number of geotechnical problems. It introduces the main factors important to the application of computer methods and constitutive models with emphasis on the behavior of soils, rocks, interfaces, and joints, vital for reliable and accurate solutions.
This book presents finite element (FE), finite difference (FD), and analytical methods and their applications by using computers, in conjunction with the use of appropriate constitutive models; they can provide realistic solutions for soil–structure problems. A part of this book is devoted to solving practical problems using hand calculations in addition to the use of computer methods. The book also introduces commercial computer codes as well as computer codes developed by the authors.
Uses simplified constitutive models such as linear and nonlinear elastic for resistance-displacement response in 1-D problems
Uses advanced constitutive models such as elasticplastic, continued yield plasticity and DSC for microstructural changes leading to microcracking, failure and liquefaction
Delves into the FE and FD methods for problems that are idealized as two-dimensional (2-D) and three-dimensional (3-D)
Covers the application for 3-D FE methods and an approximate procedure called multicomponent methods
Includes the application to a number of problems such as dams , slopes, piles, retaining (reinforced earth) structures, tunnels, pavements, seepage, consolidation, involving field measurements, shake table, and centrifuge tests
Discusses the effect of interface response on the behavior of geotechnical systems and liquefaction (considered as a microstructural instability)
This text is useful to practitioners, students, teachers, and researchers who have backgrounds in geotechnical, structural engineering, and basic mechanics courses.
Quote:They ignored signs which said it could only support 40 people, not hundreds
Because we design for some loads.
And most of the time the live load is limited by the available amount of space (2kN/sqm, about 200 kg/sqm, about 1 sumo warrior /sqm and looks reasonable.
But still it happens that we need to place a sign and say no more than 50 kg/sqm.
Because at first look there should be no reason for larger loads. Moreover a sign is there and so any additional loading is prevented.
What about the blind guys or those who don't like to read signs, like myself .
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The bridge is pinned maximum bending moment at middle according the video it looks like the collapse is caused by lateral buckling of the
handrail which is compressed, the top chord of the truss.
If the bridge was up side down, most likely it could have supported many sumo warriors.
Funny though they had handrail to prevent few from falling into watter but still they all got into water.
A fragile design, one point of failure. Finally a money issue, why build both handrail and chord when you can reuse the chord and place a sign (clearly visible for blind people, from a distance in crowded conditions ).
And instead of placing signs, some design handrails for out of plane loads caused by crowds who push it, in this case helping it buckle faster.
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is prevented.