Christian Menn (auth.), Çetin Yilmaz, S. Tanvir Wasti (eds.)'s Analysis and Design of Bridges PDF

By Christian Menn (auth.), Çetin Yilmaz, S. Tanvir Wasti (eds.)

ISBN-10: 9400961227

ISBN-13: 9789400961227

ISBN-10: 9400961243

ISBN-13: 9789400961241

The court cases of the NATO complicated research Institute on research and layout of Bridges held at ~e§me, lzmir, Turkey from 28 June 1982 to nine July 1982 are inside the current quantity. The complicated research Institute was once attended through 37 academics and members from 10 diversified nations. The Organizing Committee consisted of Professors P. Gtilkan, A. C. Scordelis, S. T. Wasti and nine. Yl. lmaz. the ideas set by means of NATO for the complicated research Institute require it to serve not just as an effective discussion board for the dissemination of obtainable complex wisdom to a specific workforce of certified humans but in addition as a platform for the exploration of destiny examine chances within the clinical or engineering parts involved. the most subject matters coated through the current complicated examine Institute have been the mathematical modelling of bridges for greater research and the clinical review of bridge behaviour for the creation of more desirable layout approaches. it's been our remark that a result of variety and intensity of the lectures offered and the various casual discussions that happened, rules grew to become fissile, the stimulus by no means flagged and lots of gaps within the engineering wisdom of the contributors have been "bridged". the following we quite desire to point out that beneficial casual presenta­ tions of study paintings have been made throughout the process the Institute through Drs. Friedrich, Karaesmen, Lamas and Parker.

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ANALYSIS TECHNIQUES The determination of the induced forces in a horizontally curved bridge system requires consideration of the interaction of the entire bridge structure. The influences of torsion (St. Venant and warping) must be included in such analysis. As indicated in the AASHTO code (2), the effects of curvature 58 may be neglected in evaluating the bending moments in the longitudinal members, according to the following; Number of Girders 5 Angle for 1 span Angle for 2 or more SEar 2 20 30 3,4 30 40 40 50 or more However, the influence of such curvature on the induced torsional forces should be examined.

The system damping cannot prevent torsional oscillations of bridges which are hung up by cables in one plane along the center-line; furthermore, the frequencies of bending and torsional oscillations are independent of each other. There may be a danger of getting torsional resonance if the box girder has a shape which would give a large cM factor (shape factor related to pitching moments), so that the wind forces could start torsional deformations. 45 Our knowledge in this respect is still limited and, therefore, a diligent investigation must be recommended.

2540mm. I11(57') 000") (100") Fig. ;:;::~~::l===~1200 5000 z 4000 -;;; Co 0 lrom BOVAS -' « f- 400 a f- o DEFLECTION AT SECTION A-A (mm) Fig. 3 Load versus Deflection Curve this bridge testing and analysis can be found in reference 2. The load levels given above are above the practical limits. If the analysis includes the residual stresses (results of which will not be presented herein), there may be a 20-30% decrease in the load levels that will cause yielding in the girders.

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Analysis and Design of Bridges by Christian Menn (auth.), Çetin Yilmaz, S. Tanvir Wasti (eds.)

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