scholarly journals A novel index for damage detection of deck and dynamic behavior of horizontally curved bridges under moving load

2017 ◽  
Vol 19 (7) ◽  
pp. 5421-5433 ◽  
Author(s):  
Farhad Daneshjoo ◽  
Alireza Arabha Najafabadi ◽  
Mahmoud Bayat
Keyword(s):  
Damage Detection ◽  
Dynamic Behavior ◽  
Moving Load ◽  
Curved Bridges ◽  
Horizontally Curved ◽  
Horizontally Curved Bridges

scholarly journals Dynamic Analysis Of Horizontally Curved Bridges

2019 ◽  
Vol 8 (9) ◽  
pp. 953-959
Keyword(s):  
Moving Load ◽  
Torsional Moment ◽  
Dead Load ◽  
Curved Bridges ◽  
Sequential Order ◽  
Skewed Bridges ◽  
Curved Bridge ◽  
Horizontally Curved ◽  
Skew Bridges ◽  
Horizontally Curved Bridges

—Horizontally curved bridges are the most feasible options at complicated interchanges or river crossings where geometric restrictions and constraint of limited site space, make difficult the adoption of standard straight superstructures. Usually these bridges are of cellular cross-section so that high torsional moment can be well resisted economically. In this paper a parametric comparison was made between straight bridge and different curved bridges and skew bridges. Then these bridges were analyzed for dead, modal and moving load cases. This was done in order to study difference in the results obtained between straight, curved and skewed bridges for dead and moving load cases. The modeling part of the both bridges was done by using SAP 2000 in which there is an option named bridge wizard by which modeling of the bridge can done in a sequential order. After analyzing for dead load case unlike straight bridge there is torsion in the curved and skew bridges along the length of the bridge as there is unsymmetrical mass distribution in curved bridge about horizontal axis. Modal analysis showed the curved and skewed bridges have more initial torsional modes but whereas for straight bridge the initial modes were transverse and longitudinal. The amplifications in torsion were large compared to other parameters for curved and skewed bridges compared to straight bridge.

Dynamic characteristics of horizontally curved bridges

2017 ◽  
Vol 24 (19) ◽  
pp. 4465-4483 ◽  
Author(s):  
Mohsen Amjadian ◽  
Anil K Agrawal
Keyword(s):  
Free Vibration ◽  
Dynamic Characteristics ◽  
Natural Frequencies ◽  
Response Spectrum ◽  
Translational Motion ◽  
Free Vibration Analysis ◽  
Mode Shapes ◽  
Curved Bridges ◽  
Horizontally Curved ◽  
Horizontally Curved Bridges

Horizontally curved bridges have complicated dynamic characteristics because of their irregular geometry and nonuniform mass and stiffness distributions. This paper aims to develop a simplified and practical method for the calculation of the natural frequencies and mode shapes of horizontally curved bridges that would be of interest to bridge engineers for the estimation of the seismic response of these types of bridges. For this purpose, a simple three-degree-of-freedom (3DOF) dynamic model for free vibration equation of this type of bridge has been developed. It is shown that the translational motion of the deck of horizontally curved bridges in the direction that is perpendicular to their axis of symmetry is always coupled with the rotational motion of the deck, regardless of the location of the stiffness center. The model is further exploited to develop closed-form formulas for the estimation of the maximum displacements of the corners of the deck of one-way asymmetric horizontally curved bridges. The accuracy of the model is verified by finite-element model of a horizontally curved bridge prototype in OpenSEES. Finally, the model is utilized to study the influence of the location of the stiffness center with respect to the deck curvature center on the natural frequency and the maximum displacements of the corners of the deck for different curvatures of the deck. The results of free vibration analysis show that the natural frequencies of one-way asymmetric horizontally curved bridges, in general, increase with the increase of the subtended angle of the deck. The results of earthquake response spectrum analysis show that the increase in the subtended angle of one-way asymmetric horizontally curved bridges decreases the radial displacements of the corners of the deck but increases the azimuthal displacement. These two responses both increase with the increase in the distance between the stiffness center and the curvature center.

Horizontally Curved Bridges

2019 ◽  
pp. 15-1-15-16
Author(s):  
Ahmad M. Itani ◽  
Mark L. Reno
Keyword(s):  
Curved Bridges ◽  
Horizontally Curved ◽  
Horizontally Curved Bridges

scholarly journals SUITABILITY OFALUMINIUM ALLOY DECKS ON STEEL GIRDERS IN HORIZONTALLY CURVED BRIDGES.

2016 ◽  
Vol 4 (4) ◽  
pp. 1097-1111 ◽  
Author(s):  
A.A. Shittu ◽  
◽  
H.S. Lukman ◽  
O.S. Abejide. ◽  
◽  
...  
Keyword(s):  
Steel Girders ◽  
Curved Bridges ◽  
Horizontally Curved ◽  
Horizontally Curved Bridges

Horizontally Curved Bridges Subject to Moving Loads

1969 ◽  
Vol 95 (8) ◽  
pp. 1615-1643
Author(s):  
Paul P. Christiano ◽  
Charles G. Culver
Keyword(s):  
Moving Loads ◽  
Curved Bridges ◽  
Horizontally Curved ◽  
Horizontally Curved Bridges
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