Horizontally Curved Girders-State of the Art

1969 ◽  
Vol 95 (5) ◽  
pp. 853-870 ◽  
Author(s):  
Paul F. McManus ◽  
Ghulam A. Nasir ◽  
Charles G. Culver
Keyword(s):  
State Of The Art ◽  
Horizontally Curved ◽  
Curved Girders

Discussion of “Horizontally Curved Girders—State of the Art”

1969 ◽  
Vol 95 (12) ◽  
pp. 2997-3000
Author(s):  
Chen Pan Tan ◽  
Sidney Shore ◽  
Konstantin Ketchek
Keyword(s):  
State Of The Art ◽  
Horizontally Curved ◽  
Curved Girders

Discussion of “Horizontally Curved Girders—State of the Art”

1970 ◽  
Vol 96 (2) ◽  
pp. 433-436
Author(s):  
Ganpat S. Pandit ◽  
Giulio Ceradini ◽  
Carlo Gavarini ◽  
Pietro Gravina ◽  
Anatol A. Eremin
Keyword(s):  
State Of The Art ◽  
Horizontally Curved ◽  
Curved Girders

Closure to “Horizontally Curved Girders—State of the Art”

1970 ◽  
Vol 96 (8) ◽  
pp. 1807-1809
Author(s):  
Paul F. McManus ◽  
Ghulam A. Nasir ◽  
Charles G. Culver
Keyword(s):  
State Of The Art ◽  
Horizontally Curved ◽  
Curved Girders

Discussion of “Horizontally Curved Girders—State of the Art”

1969 ◽  
Vol 95 (11) ◽  
pp. 2541-2542
Author(s):  
David B. Beal ◽  
Robert J. Kissane
Keyword(s):  
State Of The Art ◽  
Horizontally Curved ◽  
Curved Girders

scholarly journals Shear Strength of Trapezoidal Corrugated Steel Webs for Horizontally Curved Girder Bridges

2019 ◽  
Vol 9 (9) ◽  
pp. 1942 ◽  
Author(s):  
Sumei Liu ◽  
Hanshan Ding ◽  
Luc Taerwe ◽  
Wouter De Corte
Keyword(s):  
Analytical Formula ◽  
Curvature Radius ◽  
Horizontally Curved ◽  
Girder Bridges ◽  
Buckling Stress ◽  
Simple Support ◽  
Shear Buckling ◽  
The Difference ◽  
Curved Girders ◽  
The Galerkin Method

Curved composite girder bridges with corrugated steel webs (CSWs) have already been constructed around the world. However, limited work has been done on their shear behavior. In this paper, the corrugated steel web (CSW) in horizontally curved girders (HCGs) is treated as an orthotropic cylindrical shallow shell, and the analytical formula for the elastic global shear buckling stress is deduced by the Galerkin method. Calculation tables for the global shear buckling coefficient for a four-edge simple support, for a four-edge fixed support, and for the two edges constrained by flanges fixed and the other two edges simply supported are given. Then, a parametric study based on a linear buckling analysis is performed to analyze the effect of the curvature radius and girder span on the shear buckling stress. Analytical and numerical results show that the difference of shear buckling stress of CSWs between curved girders and straight girders is small, so the shear design formulas for straight girders can be applied for curved girders. Finally, a series of tests were performed on three curved box girders with CSWs. Similar to CSWs in straight girders, the shear strain distributions of CSWs in HCGs are almost uniform along the direction of the web height and the principal strain direction angles are close to 45°. For the three specimens, CSWs carry about 76% of the shear force. In the destructive test, shear buckling after yielding occurred in all specimens which is in good agreement with the theoretical prediction, which means that the analytical formulas provide good predictions for the shear buckling stress of CSWs in HCGs and can be recommended for design purposes.

Practical Picture Processing

1974 ◽  
Vol 32 ◽  
pp. 338-339
Author(s):  
T. A. Welton
Keyword(s):  
Radiation Damage ◽  
Coherence Length ◽  
Spatial Information ◽  
State Of The Art ◽  
Coherent Radiation ◽  
The State ◽  
Energy Spread ◽  
Electron Micrograph ◽  
Picture Processing ◽  
Molecular Skeleton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.

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