Author: Arsalan Zamir Khan | Size: 4.6 MB | Format:DOC | Quality:Unspecified | Publisher: Department of Metallurgy and Materials Engineering, Mehran University of Engineering and Technology Jamshoro, Pakistan. | Year: December, 2008. | pages: 47
This project report has been a very enlightening and rewarding experience for us in an area that is of great personal interest. We would like to acknowledge my deep sense of gratitude and indebtedness to our meritorious supervisor, Prof. Dr. Moazzam Baloch with great reverence ecstasy for his encouragement, expert advice, sincere efforts and precious time. He is really a versatile genius of high order. His devoted love is worth appreciable. We couldn’t find the words to express my deepest gratefulness to all our teachers at MUET, JAMSHORO, whose efforts made us what we are today, especially Prof. Dr. Abdul Hakeem Mallah, Chairman Department of Metallurgy and Materials Engineering for his guidance and wisdom throughout our academic carrier, Mr. Nisar Memon for his dedication to teaching and efforts he makes towards explaining the details in every subject he teaches, Mr. Riaz Memon for his moral advices and Mr. Ishfaque Ahmed Isani for his ever-ready help regarding anything computers.
We would also like to acknowledge the help offered to us by Mr. Rehan Majid, Mr. Hamid Raza and Mr. Mehboob Shah of PMO for providing the required materials for the Project and their much valued help.
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Author: John A. Rolfes / Rober A Macrimmon | Size: 0.5 MB | Format:PDF | Quality:Unspecified | Publisher: Iron & Steel Technology | Year: MAY 2007 | pages: 17
This paper discusses current seismic provisions for the design and construction of steel-framed industrial buildings. Also discussed are current design codes for, and the design of, nonbuilding structures often contained within these facilities.
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Friction dissipating joints with slotted bolt holes have been used in concentrically
braced frames (linear sliding) and more recently, in moment resisting frames (rotational sliding).
Such joints have the ability to provide many cycles of ductile energy dissipation with little or no
primary structural damage and permit the decoupling of the strength and stiffness of connected
members. Suggestions are offered on the use of linear sliding joints in K-braced frames where
they could lead to cheaper, stiffer structures with high levels of ductility. Rotating sliding bolted
joints extend the benefits of damage-free energy dissipation to moment-resisting frames. The
decoupling of beam stiffness and end moment strength avoids over-sizing columns to deal with
beam over-strength moments. The performance of a rotational slotted joint having a hierarchy of
two distinct moment levels at which limited rotational slip can occur is discussed. The basic
characteristics of the joint are described and some observations made on the seismic response of
some sample frames to seismic ground motion.
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SEISMIC DESIGN OF FRICTION DAMPED BRACED STEEL PLANE FRAMES BY ENERGY METHODS
Author: ANDRE FILIATRAULT | Size: 13.2 MB | Format:PDF | Quality:Unspecified | Publisher: THE UNIVERSITY OF BRITISH COLUMBIA | Year: 1988 | pages: 340
The investigatio n described i n t h i s thesi s represents the f i r s tknown attempt to develop a s i m p l i f i e d method fo r the seismic design ofstructure s equipped with a novel f r i c t i o n damping system. The systemhas been shown experimentally to perform very wel l and i s an excitin g development i n earthquake resistan t design. The design of a buildin gequipped with the f r i c t i o n damping system i s achieved by determining the optimum s l i p load d i s t r i b u t i o n to minimize s t r u c t u r a l response. A new e f f i c i e n t numerical modelling approach fo r the analysi s and design of F r i c t i o n Damped Braced Frames (FDBF) i s presented. The hystereti c propertie s of the f r i c t i o n devices are derive d t h e o r e t i c a l l y and include d i n a F r i c t i o n Damped Braced Frame Analysi s Program (FDBFAP), which i s adaptable to a microcomputer environment. The optimum s l i p load d i s t r i b u t i o n i s determined by minimizing a Relativ e
Performance Index (RPI) derive d from energy concepts.
The steady-state response of a singl e storey f r i c t i o n damped structur e subjected to sinusoida l ground motion i s investigate d a n a l y t i c a l l y . Basic design informatio n on the optimum s l i p load fo r the f r i c t i o n device i s obtained. The parameters governing the optimum s l i p load, which minimizes the amplitude fo r any forcin g frequency, are derived. The study indicate s that the optimum s l i p load depends on the c h a r a c t e r i s t i c s of the ground motion and of the structure .
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DESIGN OF STRUCTURAL CONNECTIONS TO EUROCODE 3 FREQUENTLY ASKED QUESTIONS
Author: Watford, September 2003 Building Research Establishment, Ltd. | Size: 10 MB | Format:PDF | Quality:Unspecified | Year: 2003
Developments in the design, fabrication and erection of steel structures together with
the introduction of new high performance materials have lead to significant changes in the design,
buildability and performance of steel structures and in particular their connections. Early steel
structures used riveted connections but following technological developments shop welded and site
bolted connections are now common place. The introduction of high strength steels has increased the
types and grades of bolt available to the designer. The range of bolts now includes ordinary strength
steels bolts such as grades 4.5, 4.6 and 5.6 and high strength steel bolts such as grades 8.8, 10.9 and
12.9. Developments in automatic fabrication have seen a move away from manually produced
drawings and setting out to sophisticated design software directly connected to numerically controlled
machines for laser cutting, punching and drilling. The quality of welding has also improved with the
introduction of continuous casting of steel and welding robots.
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Analysis and design of the prototype of a steel 1-MW wind turbine tower
Author: Lavassas, G. Nikolaidis, P. Zervas, E. Efthimiou, I.N. Doudoumis, C.C. Baniotopoulos∗ | Size: 0.85 MB | Format:PDF | Quality:Unspecified | Publisher: Engineering Structures 25 (2003) 1097–1106
In the present paper, some basic features of the analysis and the design of the prototype of a steel 1 MW wind turbine tower
are presented. The structure is 44,075 m high and has a tubular shape with variable cross section and variable thickness of the wall
along its height. The steelwork has been manufactured by steel quality S355J2G3. For the simulation of its structural response,
two different finite element models have been developed. Based on the results of the latter analyses, the design of the steel tower
for gravity, seismic and wind loadings has been performed according to the relevant Eurocodes. In particular, regarding seismic
loading, a dynamic phasmatic analysis of the tower has been carried out according to the Greek Antiseismic Code (EAK 2000).
The structure has been also checked against fatigue by applying the respective Eurocodes methodology. In the last part of the paper,
some points that concern the previous analysis and the respective design procedure are discussed in detail.
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This paper presents an innovative structural system, named weld-free system,
developed to overcome the difficulty in the quality assurance encountered in
construction of steel moment resisting frames with conventional welded connections.
The proposed structural system adopts a mechanical joint equipped with metallicyielding
damper as beam-to-column connection, wherein slip-critical joints are made by
recently developed super high-strength bolts. The structural configuration and loadcarrying
mechanism of the weld-free system are described herein. Key features of the
super high-strength bolts are also introduced. Consequently, two series of experimental
verifications of weld-free steel structures are presented. The first series was conducted
on three full-scale models of weld-free beam-column subassemblies and one base-line
specimen with conventional welded connection. The second series was performed on
the whole full-scale three-story weld-free building. The two test series clearly reveal the
efficiency of the weld-free system in enhancing large and stable hysteresis loops, while
beams and columns above the base can be proportioned to remain elastic under the
design earthquakes.
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Author: M. J . N. Priestley J . H. Wood and B. J . Davidson | Size: 3.6 MB | Format:PDF | Quality:Unspecified | Publisher: BULLETI N O F TH E NEW ZEALAN D NATIONA L SOCIET Y FOR EARTHQUAK E ENGINEERING, Vol. 19, No. 4, December 1986
A study group of the New Zealand National Society for Earthquake Engineering has recently completed recommendations for the Seismic Design of Storage Tanks, in a form suitable to be used as a code by the design profession. The recommendations cover design criteria, loading, actions and details and are based on a consistant philosophy of serviceability under the design level earthquake. This paper provides a review of the study group's recommendations.
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Article/eBook Full Name: Horizontal Response of Piles in Layered Soils
Author(s): Gazetas, G. and Dobry, R
Edition: Volume 110, Issue 1
Publish Date: 1984
ISBN: ISSN (print): 0733-9410
Published By: Journal of Geotechnical Engineering
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