Author: Kara Christine Unterreiner
Publisher:
ISBN:
Category : Composite construction
Languages : en
Pages : 318

View

Book Description

Author: Kerry Kreitman
Publisher:
ISBN:
Category :
Languages : en
Pages : 600

View

Book Description
Many continuous steel bridges constructed prior to the 1970s have floor systems consisting of a non-composite concrete deck over steel beams with no shear connectors. While many of these bridges are still in good condition, the structures may not satisfy current load requirements and thus may need to be strengthened or replaced to avoid load-posting and to maintain structural safety. One potentially economical method of extending the service life of such bridges is to post-install adhesive anchor shear connectors to create composite action between the existing steel beams and concrete deck. This is efficient in regions dominated by positive flexural demands where the concrete deck is in compression. Inelastic moment redistribution away from the interior pier sections can be considered to address strength deficiencies in these regions, which are dominated by negative flexural demands. This dissertation explores this method of strengthening continuous non-composite steel girder bridges. Of particular interest is the “shakedown” behavior of partially composite strengthened girders under large repeated loads requiring moment redistribution. These concepts are commonly referred to as “autostress” design. After conducting preliminary studies on the feasibility of this strengthening method for typical bridges in the state of Texas, an extensive large-scale experimental program was conducted in conjunction with finite element modeling. The results of the testing and modeling are discussed in detail. Design recommendations and a design example are also provided.

Author: Pol D. Spanos
Publisher: Springer Science & Business Media
ISBN: 3642850928
Category : Technology & Engineering
Languages : en
Pages : 621

View

Book Description
This symposium is the seventh of a series of IUTAM sponsored symposia which focus on probabilistic methods in mechanics. It is the sequel to the series of meetings in Coventry, UK (1972), Southhampton, UK (1976), Frankfurt/Oder, Germany (1982), Stockholm, Sweden (1984), Innsbruck/Igls, Austria (1987), and Turin, Italy (1991). The symposium focused on advances in the area of probabilistic mechanics with direct application to structural reliability issues. The contributed papers address collectively the four components of a structural reliability problem. They are: characterization of stochastic loads, description of material properties in terms of fatigue and fracture, response determination, and quantitative assessment of the reliability of the structural system. Four Keynote Lectures by V. Bolotin (Russia), o. Ditlevsen (Denmark), R. Heller (USA), and F. Ziegler (Austria) were delivered; the remaining contributed papers were organized in ten technical sessIons. A reception was hosted by Dr. Y. Wu the first day of the symposium; the second day of the symposium a banquet was hosted by Dr. P. Spanos, with Dr. N. Abramson serving as the banquet speaker. Closing remarks were provided by the IUTAM Secretary General, Dr. F. Ziegler.

Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 130

View

Book Description

Author: D. Dubin&acaron;
Publisher: Elsevier
ISBN: 0080552927
Category : Technology & Engineering
Languages : en
Pages : 659

View

Book Description
With the gradual development of rules for designing against instability the idea emerged, in London, in 1974 to hold an International Colloquium treating every aspect of structural instability of steel structures. There have been 17 International Colloquia Stability Sessions around the world, starting with the first one in Paris in 1972, until with the last one in Nagoya in 1997. In Nagoya it was decided to continue the series of travelling colloquia by launching the Sixth Colloquium in September 1999 with the First Session to be held at the "Politehnica" University of Timişoara, România, which will be followed by another in the year 2000 at the Gediminas Technical University in Vilnius, Lithuania, a third one during SSRC's Year 2000 Annual Meeting in the US, and a fourth one in Australia or New Zealand. At present important research projects are in progress around the world, like SAC Joint Venture Project in USA, INCO-COPERNICUS "RECOS" in Europe and others, which are devoted to improve and develop new methods for the safety design of steel structures in seismic zones. Special attention is paid in Europe, USA and Japan to improve the design codes and detailing of seismic resistant steel structures. This was the reason to organise the Session of Nagoya as "Stability and Ductility of Steel Structures" Colloquium. Romania is also a strong seismic territory and therefore, the topic of the Timişoara Session covered both stability and ductility problems. The technical programme of the SDSS'99 Colloquium in Timişoara has been split into nine working sessions.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 6

View

Book Description
According to standards CAN/CSA-S6-88 and OHBDC (1983), a fully plastic stress distribution or a linear stress distribution at first yielding of the steel section should be used to determine the factored bending resistance of a composite section made of a non-compact steel section, depending upon the depth of the compression portion of the web. In this paper, an elastoplastic analysis is presented and is illustrated by an example. Comments on some clauses from the S6 Standard are also presented.

Author: Journal Editors
Publisher: Elsevier
ISBN: 9780080440385
Category : Technology & Engineering
Languages : en
Pages : 524

View

Book Description
This compendium is made up of a selection of the best and most representative papers from a group of Elsevier's structural engineering journals. Selections were made by the journal's editorial teams. The papers appeared in the following journals during 2000: Journal of Constructional Steel Research P.J. Dowling, J.E. Harding, R. Bjorhovde Thin Walled Structures J. Loughlan, K.P. Chong Engineering Structures P.L. Gould Computers and Structures K.J. Bathe, B.H.V. Topping Construction and Building Materials M.C. Forde Journal of Wind Engineering & Industrial Areodynamics N.P. Jones Marine Structures P.A. Frieze, A. Mansour, T. Yao Each paper appears in the same format as it was published in the journal; citations should be made using the original journal publication details. It is intended that this compendium will be the first in a series of such collections. A compendium has also been published in the area of geotechnical engineering.

Author: Donald W. White
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 150

View

Book Description

Author: Ronald D. Ziemian
Publisher: John Wiley & Sons
ISBN: 0470085258
Category : Technology & Engineering
Languages : en
Pages : 1120

View

Book Description
The definitive guide to stability design criteria, fully updated and incorporating current research Representing nearly fifty years of cooperation between Wiley and the Structural Stability Research Council, the Guide to Stability Design Criteria for Metal Structures is often described as an invaluable reference for practicing structural engineers and researchers. For generations of engineers and architects, the Guide has served as the definitive work on designing steel and aluminum structures for stability. Under the editorship of Ronald Ziemian and written by SSRC task group members who are leading experts in structural stability theory and research, this Sixth Edition brings this foundational work in line with current practice and research. The Sixth Edition incorporates a decade of progress in the field since the previous edition, with new features including: Updated chapters on beams, beam-columns, bracing, plates, box girders, and curved girders. Significantly revised chapters on columns, plates, composite columns and structural systems, frame stability, and arches Fully rewritten chapters on thin-walled (cold-formed) metal structural members, stability under seismic loading, and stability analysis by finite element methods State-of-the-art coverage of many topics such as shear walls, concrete filled tubes, direct strength member design method, behavior of arches, direct analysis method, structural integrity and disproportionate collapse resistance, and inelastic seismic performance and design recommendations for various moment-resistant and braced steel frames Complete with over 350 illustrations, plus references and technical memoranda, the Guide to Stability Design Criteria for Metal Structures, Sixth Edition offers detailed guidance and background on design specifications, codes, and standards worldwide.

Author: Hani Melhem
Publisher:
ISBN:
Category : Bridges, Iron and steel
Languages : en
Pages : 92

View

Book Description
The changes in the properties of a multi-span continuous steel girder composite bridge during construction can cause final dead load deflections that are quite different from the calculated theoretical values. The casting rate and the sequence of span casting affect the development of concrete stiffness which can significantly affect the final dead load deflections. The study involved two activities: collecting data from the testing of concrete cylinders and laboratory-size beams representative of composite bridge girders and developing a computer program that calculates dead load deflections during construction based on the data from the laboratory testing. The 300 concrete cylinders were tested at ages varying from 2 to 36 hours after pouring to establish stress-strain relations in axial compression. The four composite beams (20 ft (6.1 m) long) with 16 strain gages and 4 deflection gages were tested by applying small incremental loads starting soon after the concrete was poured. Based on these measurements, the change in stiffness of the composite beam was computed and the concrete properties evaluated. The test results helped obtain a relationship that describes the variation of the concrete Young's Modulus with time varying from 2 to 36 hours. Best results were obtained between 4 and 19 hours. The relationship established seems logical and appeared to be consistent in all tests. It was implemented in the computer program and is most valid for ages up to 10 hours. The additional concrete stiffness gained after 10 hours is based on the slope of the curve at 10 hours and a limitation factor that determines the characteristic length of the transition polynomial and which specifies how soon the curve should be asymptotic to the standard value of the 28-days modulus of elasticity. The computer program was verified, however, additional research is needed to test the program more rigorously, to study the effect of concrete confinement and the use of plasticizers, and to compare the results of additional test data with actual field measurements. The effect of the weight of construction equipment should also be studied. Excessive bridge deflection could be avoided with a better understanding of the factors and parameters that affect the deflection.