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Author: Roger Meier; Andrew Abbo; Linbing Wang | Size: 31 MB | Format:PDF | Quality:Original preprint | Publisher: ASCE | Year: 2010 | pages: 292 | ISBN: 9780784411018
Soil Behavior and Geo-Micromechanics (GSP 200) contains 41 papers addressing many different areas of soil behavior, constitutive modeling, and geo-micromechanics. The papers in this Geotechnical Special Publication range from experimental studies of soil shear strength and compressibility to theoretical advances in Biot's consolidation theory and constitutive modeling. The research described in this proceedings advances our understanding of soil as an engineering material and improves our ability to model the behavior of soil in slopes, foundations, and earth structures. The papers in this publication were presented during the GeoShanghai 2010 International Conference held in Shanghai, China, June 3-5, 2010.
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ACI 318-08 DEVELOPMENT AND SPLICES OF REINFORCEMENT
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A practical guide to analyzing soil and structural systems using Excel spreadsheets and VBA macro programs (in open-source code) that are provided on the accompanying CD.
This book gives readers the tools to understand the methods such as finite element analysis used to analyze common problems in structural engineering, foundation engineering and soil-structure interaction. The book has value just based on its instructions in Excel spreadsheets and the Visual Basic for Applications (VBA) macro programming language alone. By providing an expert system and guidance to the reader in its use through examples, the author shows the methods and simple modelling techniques that demystify soil-structure applications by presenting the essentials in a clear and concise way.
The book also addresses some of the disappointments in geo-engineering by providing tools to calculate deformations, implement soil-structure interaction procedures, provide simple computer solutions, while incorporating proper soil and rock properties in the analyses.
Can be used by students or practicing professional engineers as a hands-on self-study guide as prewritten complete Excel spreadsheets and VBA programs are applied to many different Civil Engineering example problems
VBA code techniques and its use and programming are explained but a working knowledge is not required to use the spreadsheet and programs provided
Computations are performed using VBA macro programs getting input data from worksheet cells (whereby the spreadsheet functions as a pre-processor) or from input data files
Robert L. Sogge has a background which includes training, teaching, research and practical consulting in the area of soil-structure interaction. He achieved his PhD in Civil Engineering at the University of Arizona, USA, and practices in that state and California. He has developed many of these computer programs in the pursuit of his work as a consultant.
Science for Environmental Protection: The Road Ahead
Author: Committee on Science for EPA's Future, Board on Environmental Studies and Toxicology, Division on Earth and Life Studies, National Research Council | Size: 5.4 MB | Format:PDF | Quality:Original preprint | Publisher: National Academies Press | Year: 2012 | pages: 164 | ISBN: 9780309264891
In anticipation of future environmental science and engineering challenges and technologic advances, EPA asked the National Research Council (NRC) to assess the overall capabilities of the agency to develop, obtain, and use the best available scientific and technologic information and tools to meet persistent, emerging, and future mission challenges and opportunities. Although the committee cannot predict with certainty what new environmental problems EPA will face in the next 10 years or more, it worked to identify some of the common drivers and common characteristics of problems that are likely to occur.
Tensions inherent to the structure of EPA's work contribute to the current and persistent challenges faced by the agency, and meeting those challenges will require development of leading-edge scientific methods, tools, and technologies, and a more deliberate approach to systems thinking and interdisciplinary science. Science for Environmental Protection: The Road Ahead outlines a framework for building science for environmental protection in the 21st century and identified key areas where enhanced leadership and capacity can strengthen the agency's abilities to address current and emerging environmental challenges as well as take advantage of new tools and technologies to address them. The foundation of EPA science is strong, but the agency needs to continue to address numerous present and future challenges if it is to maintain its science leadership and meet its expanding mandates.
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Studies of Bond Between Concrete and Steel and Related Factors -5 Papers
Author: Carl A. Menzel,Williams M. Woods | Size: 17.75 MB | Format:PDF | Quality:Scanner | Publisher: PCA | Year: 1952 | pages: 300
A Compilation of the following five papers:
PAPER I Some Factors Influencing Results of Pull-Out Bond Tests
by Carl A. Menzel
PAPER II A Proposed Standard Deformed Bar for Reinforcing Concrete
by Carl A. Menzel
PAPER III Some Factors Influencing the Strength of Concrete Confining Admixtures of Powdered Aluminum
by Carl A. Menzel
PAPER IV Effect of Settlement of Concrete on Results of Pull-Out Bond Tests
by Carl A. Menzel
pAPER V An Investigation of Bond, Anchorage and Related Factors in Reinforced Concrete Beams.
by Carl A. Menzel and Williams M. Woods
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It is anticipated that the construction of homes and multiple storey buildings which
incorporate light gauge steel frame I wood panel shear walls as primary lateral load
resisting elements will increase across Canada in coming years. This includes sites
that have a relatively high seismic risk, such as found along the West Coast of
British Columbia and in the Ottawa and St. Lawrence River Valleys. With this rise
in construction activity comes an accompanying increase in the probability that a
light gauge steel frame structure will be subjected to the demands of a severe
earthquake. Currently, guidelines for engineers with which the design of laterally
loaded light gauge steel frame I wood panel shear walls can be carried out are not
available in Canada. For this reason an extensive shear wall research program has
been undertaken at McGill University.
This thesis provides details on the 109 specimen main testing program as well as a
summary of past wood frame and steel frame shear wall research. An extensive
review of existing data interpretation methodologies is presented. The equivalent
energy elastic-plastic (EEEP) technique is chosen as most suitable for the wall
systems under study to deduce key design parameters including the yield wall
resistance, elastic stiffness, and system ductility. It is recommended that the EEEP
methodology be implemented for all future steel frame I wood panel shear wall
data interpretation. The calibration of a resistance factor for use with the limit
states design philosophy consistent with the upcoming draft version of the 2005
National Building Code of Canada (NBCC) is also presented.
It was found that a resistance factor (<l>) of 0.7 provided sufficient reliability and a
reasonable factor of safety under the NBCC wind loading case. Final nominal
strength and unit elastic stiffness values for use in design are presented in tabular
format according to given perimeter fastener schedules. Finally, recommendations
for future research and testing are outlined.
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Blast resistant design in the civil sector is a balancing act of risk assessment versus cost of protection. Modem steel buildings designed under the provisions of current codes and
practices, particularly those in urban environments, are incapable of maintaining structural integrity under the influence of random acts of terrorism. Protective measures should focus on minimizing the level of avoidable deaths during a blast, by ensuring that blast loadings do not contribute to structural failure that is remote from the applied load. In order to achieve a complete level of redundancy, it is necessary to relate local structural behavior to global structural behavior.
A typical 11-story office building has been designed for gravity and wind loads. The structure is subjected to three cases of blast loadings on vulnerable regions of the building complex. Elements are modeled using a single degree of freedom dynamic analysis, whereby they are subjected to failure criteria. Upgrades and reinforcement proposals reflect minimum provisions for the prevention of progressive collapse. It is determined that an additional 10.5% of steel for beams, 13% for columns, 22% for connections, and 8.2% for miscellaneous metal are required for upgrade of the steel frame.
ii
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Approximately thirty to forty percent of all bridges across North America have some
form of deterioration on them. Many organizations/agencies across North America are
investing significant amounts of money on repairing and rehabilitating their bridges. The
reason being, these bridges are deteriorating due to heavy use (overloading from today' s
oversized trucks), old age (many built in late 1950s and 1960s) and environmental and
chemical attacks (deicing salt applications during the winter season).
The purpose of this thesis concentrated on one area, namely bridge decks. To better
understand how these organizations/agencies were dealing with bridge deck deterioration,
a survey containing thirteen questions was developed and sent out throughout North
America, to Department of Transportation, Ministry of Transportation, Municipalities,
Bridge Authorities and Consultants.
The survey was made up of six parts, each focusing on different areas during a bridge
rehabilitation/repair operation. Areas looked at were: Condition Surveys, Concrete
Removal, Rehabilitation Techniques, Environmental Impacts and Service Life.
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Lack of a scientific design approach for repair and rehabilitation of corroding
reinforced concrete infrastructure has resulted in significant financial and social costs.
This experimental program was primarily undertaken to examine the corrosion process in
reinforced concrete repair, which has different characteristics as compared with corrosion
in new construction. The program was designed to gain a deeper understanding of how
certain restoration strategies may lead to problems of electrochemical incompatibility and
result in ineffective corrosion mitigation.
Fifteen specimens, 1m by 1m by 0.2m, were cast to represent a section of a
deteriorating reinforced concrete bridge deck slab. The central portion was uniquely
designed to simulate the deterioration caused by corrosion activity in a bridge deck slab.
After initiating corrosion using wetting and drying cycles with 15 %salt solution, each
specimen was subjected to a unique restoration strategy. The wetting and drying cycles
continued, and a monitoring program was established to observe the corrosion activity of
each specimen.
The results corroborate current research, that patch repairs can trigger the
formation of a macrocell corrosion cell, or a ring of active corrosion surrounding the
repaired zone. In addition, the results from the electrochemical testing revealed sharp
differences in the corrosion behaviour of the different restoration strategies. However, the
physical evidence of minimal corrosion for all four specimens that were demolished at
the end of the testing period, reveals a discrepancy with the electrochemical testing
results.
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