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Download e-book for kindle: Bridge aerodynamics : proceedings of a conference; London, by coll.

By coll.

ISBN-10: 0727701355

ISBN-13: 9780727701350

ISBN-10: 0727745867

ISBN-13: 9780727745866

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Wind Effects on Buildings and Structures Ottawa 1967. Appendix I Parts I and II: NPL Report Mar, R127, June 1975. Tp. 47 W. C. ARROL, and MSc, Department of Transport S. C H A T T E R J E E , PhD, Department of Transport Implications of the Rules on bridge design —past and future INTRODUCTION 1. Following the collapse of Cleddau Bridge at Milford Haven and the Yarra Bridge in Australia, the Merrison Committee was appointed in 1970 to consider the design criteria for box girder bridges. The committee were also asked to devise new design rules where necessary and to indicate areas requiring further research.

Iii) single rectangular boxes , generally produced higher vertical bending response than single trapezoidal boxes. iv) single trapezoidal boxes produced higher vertical bending response than twin box section configurations. v) there was no significant pattern of behaviour between the section types for torsional motion. However, it was not possible to isolate the effect of specific parameters to the degree that would permit an accurate prediction to be built up from basic values related to the structural form and overall geometric ratios, by superposition of specific allowances for (for example) edge detail and parapet and barrier configurations.

In general, strong winds flowing over flat terrain will be subject 29 British design rules to limited transient inclinations due to gusts. Much larger inclinations may arise in low speed w i n d s , perhaps up to 10 m/s mean speed, due to thermal effects. Longer-term average inclina­ tions may affect part or all of a bridge due to the specific influence of local topography; in some cases the resulting non-uniformity over the span is believed to have been beneficial to stability. No cases are known to the authors where this effect has been adverse, but reported data on inclinations resulting from topography are scanty.

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Bridge aerodynamics : proceedings of a conference; London, 25-26 March, 1981 by coll.


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