Author: Henry L. Kinnier
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
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Book Description
This report describes the experimental and analytical study of a rigid frame highway bridge conducted under the auspices of the Federal Highway Administration and the Virginia Highway & Transportation Research Council. Data collected during the experimental phase provided measures of strains and deflections at midspan of selected girders and strain data in the vicinity of one of the haunches. These data, along with calculated values of bending moment based on the measurements, provided a basis for evaluating the design and for comparison with subsequently calculated analytical data. The theoretical study was performed by modeling a typical rigid frame girder as a series of flexural elements and analyzing the model using a finite element computer program. Results obtained included shears, moments and deflections at each node point on the model; also influence lines for moment and deflection at midspan and at the haunch extremities were generated. Calculated values of moment and deflection were found to compare quite favorably with those determined from the experimental study. Effects of various parameters on moments and deflections were studied by varying such characteristics as haunch representation, support conditions and member representation. Variations in support conditions were found to be the only parameter to have any significant effect on moments and deflections, and then primarily on stresses in the vicinity in the haunch.
Author: Steven Del Leftwich
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 130
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Book Description
Author: Ching-Sheng Wu
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 84
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Book Description
Author: Clifford David Williams
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 64
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Book Description
Author: Steven Del Leftwich
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 47
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Book Description
The purpose of this study was to obtain an understanding of the behavior and stress distribution in the haunch region of a rigid frame highway bridge. A finite element model of the haunch of the bridge was developed to permit the prediction of stress levels within the haunch region. Loadings on this region were determined using an analytical model of the total frame. Results from an analytical model of the haunch region were compared with the results obtained from previously made field tests of the studied bridge. Stress contours of minimum principal stress in the haunch were plotted for live loading by a test vehicle placed at three locations. Areas of probable high stress concentrations were identified, and the effect of varying web and flange thicknesses on live load stress levels in these regions was determined. Current analysis procedures of the region are generally based on a method proposed by Olander. A comparison between stresses calculated in this study and those determined by Olander's method indicated that Olander's procedure may be on the nonconservative side and designers should be extremely cautious in its use. Though only one bridge configuration and haunch geometry was considered, it is believed that the results from this study can be readily extrapolated to haunch configurations in other rigid frame bridges.
Author: Joseph Simeon Ward (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 160
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Author: Arpad A. Pap
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 278
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Book Description
Author: Conrad Heins
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 548
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Book Description
Provides complete, integrated coverage of structural analysis and design of conventional and modern bridges, with appropriate specifications and design examples. Also examines bridge history and development, materials, and loads. Demonstrates design procedures and development, the organization of design computations, and the interpretation of AASHTO design specifications. Includes discussions of substructures, bridge piers, abutments, and bridge rating and repair.
Author: Henry John Banach
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 114
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Book Description
Author: Henry Lee Kinnier
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 63
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Book Description
A comprehensive field test was conducted on a highway truss bridge in Allegheny County, Virginia, in July 1974. All typical truss members as well as structural members of the bridge floor system were instrumented and unit strains measured when the structure was loaded with a 3-axle tractor trailer weighting 78,000 lb. placed in incremental positions throughout its length. The purpose of the study was to determine the present capacity of this representative older type design that was used extensively in the. 1920's and 1930's and is represented in many bridges which remain in use today. Although the structure was designed for two 30,000 lb. vehicles passing, it was found that the static loading of the 78,000 lb. test vehicle did not cause serious stresses.
