Experimental Investigation of a Prestressed Concrete Girder Bridge Model PDF Download
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Author: Ryan Robert Paradis
Publisher:
ISBN:
Category :
Languages : en
Pages : 344
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Book Description
Loads were applied to the structure in the undamaged condition to obtain baseline behavior and at various levels of damage. Damage was inflicted to the exterior girder of the bridge to simulate field damage. Damage consisted of both removal of concrete and the severing of the prestressing strands. Concrete and steel were removed in small increments so that critical levels of damage could be determined. A total of thirteen levels of damage were inflicted on the exterior girder, each subjected to various load tests. The results of the tests are compared throughout the range of damage levels to determine bridge behavior in the damaged condition.
Author: Ryan Robert Paradis
Publisher:
ISBN:
Category :
Languages : en
Pages : 344
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Book Description
Loads were applied to the structure in the undamaged condition to obtain baseline behavior and at various levels of damage. Damage was inflicted to the exterior girder of the bridge to simulate field damage. Damage consisted of both removal of concrete and the severing of the prestressing strands. Concrete and steel were removed in small increments so that critical levels of damage could be determined. A total of thirteen levels of damage were inflicted on the exterior girder, each subjected to various load tests. The results of the tests are compared throughout the range of damage levels to determine bridge behavior in the damaged condition.
Author: Frederick Lane Moreadith
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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Book Description
Author: Amar Hadj-arab
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
An experimental study of the behaviour of a 1:7.10 scale direct physical model of a simply supported single span, one cell, prestressed concrete box girder bridge is presented. The experimental techniques developed for construction and the instrumentation required during testing of the bridge model are summarized. Variation of the flexural stiffness and the dynamic characteristics, such as the damping ratio and the fundamental natural frequency, of the bridge model at different level of damage are presented. [...].
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Book Description
Experimental data from static and dynamic tests on 1/7-scale direct models of simply supported, one- and two-cell, box girder bridges are presented. Variation of flexural and torsional stiffnesses and dynamic characteristics, such as the natural frequency of vibrations and dampinig ratios of the bridge models at different levels of cracking damage, are examined; in turn, these dynamic characteristics can be used to estimate the cracking damage in the bridge. the physical model proved to be an adequate tool for the study of static and dynamic responses of box girder bridges at all load levels.
Author: James M. Thompson
Publisher:
ISBN:
Category : Precast concrete
Languages : en
Pages : 300
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Book Description
Author: Oscar M. Valencia
Publisher:
ISBN:
Category : Continuous bridges
Languages : en
Pages : 0
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Book Description
Author: Amar Hadj-Arab
Publisher:
ISBN:
Category : Box girder bridges
Languages : en
Pages : 256
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Book Description
Author: Karim Joucdar
Publisher:
ISBN:
Category : Box girder bridges
Languages : en
Pages : 348
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Book Description
Author: Eric Steven Throckmorton
Publisher:
ISBN:
Category :
Languages : en
Pages : 243
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Book Description
Author: Jonghang Lee
Publisher:
ISBN:
Category : Concrete beams
Languages : en
Pages :
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Book Description
An experimental and analytical study was conducted on a BT-63 prestressed concrete girder to investigate the thermal effects on the girder. A 2D finite element heat transfer analysis model was then developed which accounted for heat conduction, convection, radiation, and irradiation. The solar radiation was predicted using the location and geometry of the girder, variations in the solar position, and the shadow from the top flange on other girder surfaces. The girder temperatures obtained from the 2D heat transfer analysis matched well with the measurements. Using the temperatures from the 2D heat transfer analysis, a 3D solid finite element analysis was performed assuming the temperatures constant along the length of the girder. The maximum vertical displacement due to measured environmental conditions was found to be 0.29 inches and the maximum lateral displacement was found to be 0.57 inches. Using the proposed numerical approach, extremes in thermal effects including seasonal variations and bridge orientations were investigated around the United States to propose vertical and transverse thermal gradients which could then be used in the design of I-shaped prestressed concrete bridge girders. A simple beam model was developed to calculate the vertical and lateral thermal deformations which were shown to be within 6% of the 3D finite element analyses results. Finally, equations were developed to predict the maximum thermal vertical and lateral displacements for four AASHTO-PCI standard girders. To analyze the combined effects of thermal response, initial sweep, and bearing support slope on a 100-foot long BT-63 prestressed concrete girder, a 3D finite element sequential analysis procedure was developed which accounted for the changes in the geometry and stress state of the girder in each construction stage. The final construction stage then exposed the girder to thermal effects and performed a geometric nonlinear analysis which also considered the nonlinear behavior of the elastomeric bearing pads. This solution detected an instability under the following conditions: support slope of 5¡©6 and initial sweep of 4.5 inches.
