Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Lateral Distribution of Dynamic Loads in a Prestressed Concrete Box-Beam Bridge Drehersville Bridge
The report describes the field testing of a two-lane beam-slab highway bridge consisting of a reinforced concrete deck supported by five precast prestressed concrete box girders. The test structure was the first of five similar structures included in an investigation of lateral load distribution in bridges of this particular type. The principal objectives were to develop information on the distribution of vehicle loads to the girders, and to evaluate various field test techniques for use in the following studies. The report covers the effects of moving vehicles on lateral distribution of load to the girders. The effects are compared with the results from crawl-runs (2 mph) of the load vehicle, as described in an earlier report. It was found that increases in moment coefficients over crawl-run values were generally less than the value of the impact factor (50/L+125) used in the design of the structure. The differences were greater for the interior girders than for the exterior girders. However, it is felt that runs at speeds greater than 34 mph are necessary before the absolute maximum increases can be determined. Also, it was found that the magnitudes of the distribution coefficients were relatively insensitive to the speed of the load vehicle. The distribution factors resulting from crawl-run tests were greater than those developed from the speed runs. The use of superposition yielded excellent results for crawl-run loading and for one truck at crawl speed with the other at a higher speed. However, with both trucks at high speeds, the correlation of values from two-truck runs with those obtained by superposition was poor. The measured natural frequency of the unloaded bridge was in close agreement with the theoretical value. (Author)
Lateral Distribution of Dynamic Loads in a Prestressed Concrete Box-Beam Bridge Drehersville Bridge
The report describes the field testing of a two-lane beam-slab highway bridge consisting of a reinforced concrete deck supported by five precast prestressed concrete box girders. The test structure was the first of five similar structures included in an investigation of lateral load distribution in bridges of this particular type. The principal objectives were to develop information on the distribution of vehicle loads to the girders, and to evaluate various field test techniques for use in the following studies. The report covers the effects of moving vehicles on lateral distribution of load to the girders. The effects are compared with the results from crawl-runs (2 mph) of the load vehicle, as described in an earlier report. It was found that increases in moment coefficients over crawl-run values were generally less than the value of the impact factor (50/L+125) used in the design of the structure. The differences were greater for the interior girders than for the exterior girders. However, it is felt that runs at speeds greater than 34 mph are necessary before the absolute maximum increases can be determined. Also, it was found that the magnitudes of the distribution coefficients were relatively insensitive to the speed of the load vehicle. The distribution factors resulting from crawl-run tests were greater than those developed from the speed runs. The use of superposition yielded excellent results for crawl-run loading and for one truck at crawl speed with the other at a higher speed. However, with both trucks at high speeds, the correlation of values from two-truck runs with those obtained by superposition was poor. The measured natural frequency of the unloaded bridge was in close agreement with the theoretical value. (Author)
Lateral Distribution of Dynamic Loads in a Prestressed Concrete Box-Beam Bridge Drehersville Bridge
A. A. Guilford (Autor:in) / D. A. VanHorn (Autor:in)
1967
123 pages
Report
Keine Angabe
Englisch
Lateral distribution of vehicular loads in prestressed concrete box-beam bridge -- Berwick bridge
| Engineering Index Backfile | 1967
Lateral distribution of static loads in prestressed concrete drehersville bridge -- 2
| Engineering Index Backfile | 1967