Concrete walls are the seismic-force-resisting system of choice for high-rise buildings on
the west coast of Canada, and they are becoming an increasingly popular system in other
seismically active regions of the world.
A concrete wall system dissipates energy during earthquakes by forming inelastic
mechanisms at the base, and in the coupling beams (for coupled walls). For this to occur
in a safe and controlled manner, the inelastic rotational demand on the walls and the
coupling beams must not exceed the inelastic rotational capacities of these elements.
The inelastic rotational demand on a concrete wall or coupling beam can be determined
using non-linear dynamic analysis; however simplified methods are preferable for design.
Axial forces are developed in the wall piers of a coupled wall system when shear
forces are transferred from the coupling beams. The Canadian Concrete Code A23.3-94
requires the factored resistance of the wall piers in axial tension be greater than or equal
to the sum of the nominal shear strengths of the coupling beams. While this certainly
applies to short walls, it is a matter of debate as to whether it should also be applied to
high-rise walls. Additionally, it is not known how the performance of coupled walls is
affected if the walls do yield in axial tension. Allowing for a reduction in the tension
capacity for tall coupled walls would allow for a more cost-effective design.
In this study, simple and rational procedures are developed to estimate the
inelastic rotational demand of concrete walls, and the maximum total coupling beam
chord rotation and, the performance of concrete walls with axial yielding is assessed.
These findings were derived on an understanding of the behaviour of concrete walls,
based on the results from numerous dynamic analyses.
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This work presents a method for estimating the expected damage caused by an earthquake
on steel buildings in Puerto Rico. Since Puerto Rico is located between a series of tectonic
faults, buildings could suffer the damages caused by a major earthquake. The objective of
this research is to develop the information needed for insurance companies to estimate the
earthquake damage of steel buildings in a simple and practical way. Steel buildings typically
found in Puerto Rico have been analyzed. The response of these buildings to many
acceleration time histories have been recorded. With these recorded data, fragility curves
which indicate the probability of a damage state to occur were created. A cost per square
foot has been assigned to each damage state. This cost is then multiplied by the probability
of damage for each damage state and the final expected cost for the total damage is obtained.
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Externally bonded fiber reinforced polymer (FRP) composites are an increasingly
adopted technology for the renewal of existing concrete structures. In order to encourage the
further use of these materials, a design code is needed that considers the inherent material
variability of the composite, as well as the variations introduced during field manufacture and
environmental exposure while in service. Load and Resistance Factor Design (LRFD) is a
reliability-based design methodology that provides an ideal framework for these
considerations and is compatible with existing trends in civil engineering design codes. This
dissertation studies the application of LRFD to FRP strengthening schemes with an emphasis
on wet layup, carbon fiber composites applied to reinforced concrete T-beam bridge girders.
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Observations after the 1994 Northridge earthquake revealed the limited ductility
capacity of welded connections. It has been established that typical welded connections
are susceptible to abrupt stiffness and strength loss at rotations as low as 1/10th of the
presumed ductility capacity. Furthermore, variations in the ductility capacity of
“improved” welded connections reflect the effects of inevitable variations in the weld
quality. It has also been demonstrated that bolted frames originally designed for gravity
loads retain their lateral load resisting capacity up to interstory drift ratios of three
percent. In this study, the possibility of improving the earthquake resistance of structural
steel buildings by utilizing the stable and ductile response of bolted frames was
investigated. Based on a satisfactory limit to interstory drift ratio set as two percent, the
earthquake resistances of representative three- and nine-story steel buildings designed for
regions of high seismicity were found to be inadequate. Reductions in the interstory drift
ratios were obtained by increasing the stiffness of bolted interior frames. Ultimately, it
was demonstrated that, subjected to equal ground-motion demands, buildings with bolted
frames are more likely to sustain interstory drift ratios not exceeding two percent than
comparable buildings with welded perimeter frames and bolted interior frames.
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Hi friends
Please share these articles; Buckling of Thin-Walled Circular Cylinders Under Axial Compression and Internal Pressure
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Elastic stability of thin-walled cylindrical and conical shells under axial compression
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The much-anticipated new edition of the popular project management introductory bookThe role of the project manager continues to become more diverse and demanding, placing strong project management skills in high demand. This in-depth introductory guide offers aspiring project managers the essential fundamentals of project management. Fully revised since the previous version, this new edition includes updated project management methods and practices as well as new examples and study questions. Project management guru Kim Heldman presents you with a clear, concise, and enjoyable writing style so that you can approach project management from a practical?rather than theoretical?standpoint. Serves as an introduction to the fundamentals of project managementProvides completely updated and revised material on project management methods and practicesFeatures new examples and study questionsAddresses how to create project schedules and budgets and define project goalsCovers project management principles, Project Management Institute?s project management standards, and practical application of project management for the workplaceWhether you're considering a career in project management or simply wish to expand?your understanding of general project management principles, Project Management JumpStart, Third Edition is ideal reading.
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Prepare for a Project Management Career—Fast!Project Management JumpStart gives you the solid grounding you need to approach a career in project management with confidence.The basic skills of a successful project managerCreating project schedules and determining project budgetsWinning the support of department managersMonitoring project progress, resources, and budgetsCommunication and negotiation skillsTips for motivating people who don't work for youEffective documentation skills for essential project management documents
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PE Review - CE . Foundation & Retaining Structures
Author: Alan Williams PhD, SE C.Eng | Size: 3,6 MB | Format:PDF | Quality:Unspecified | Publisher: Austin TX | ISBN: ISBN 0 - 7931 - 8507 - 6
Usefull file for getting your PE.
Only part 4 . Foundation & Retaining Structure
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BS 0,A standard for standards, is the main document by which BSI sets out how British Standards and related documents are developed and maintained.
This edition of BS 0 is in a single part, covering broadly the same scope as BS 0-1:2005. The drafting rules previously specified in BS 0-2:2005 have been replaced by a version of the ISO/IEC Directives, Part 2:Rules for the drafting and
presentation of International Standards[N1], which incorporates much of the BSI-specific drafting guidance previously presented in other documents.
Reverting to earlier practice, the provisions of this British Standard are not expressed as absolute requirements, but as principles. These establish the basis on which common expectations can confidently be held, whilst allowing some
flexibility in interpretation and application. The exercise of this flexibility has to be based on a soundly reasoned consideration of what is appropriate, reasonable, necessary and practicable in any particular context. This approach is intended to provide an effective framework for British Standards to support the
increasingly diverse markets and circumstances in which they are developed and applied.
Replaces BS 0-1:2005 and BS 0-2:2005 which remain current.
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