El Pecado De Chumico
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The present paper reports the experimental results of structural steel frame and masonry elements made of normal constructional cement concrete designed for an experimental bridge with eight lanes. Relative behavior of the structural concrete beams and vertical columns in the experimental bridge was evaluated under deformations and loadings produced by target traffic loads. Load-deformation and load-deflection behaviors of the steel frame elements both in static and dynamic conditions was investigated. Additionally, experimental behavior of the bridge was compared to the predicted and the measured in-service responses of the bridge in the same study. In the study, a structural bridge of eight lanes and fixed section concrete box girder frame with three deck spans and 16 partial box columns was designed and fabricated. The deck box spans were a uniform and a variable (equal to the length of the deck box span) deck box span. The concrete bridge was tested at Riga University of Technology, Riga, Latvia in six different configurations. The experimental results of the bridge performance in both static and dynamic conditions were compared to the numerical results and measured in-service bridge response. By comparing, the present results the experimental design and the fabrications of the bridge were proven to have an acceptable level of accuracy and the reliability of all elements. Nevertheless, the fatigue limit test of the bridge predicted to be less than 1.5% of the ultimate limit load. (orig.) With full text (HTML)
Simultaneously with the increase in application of appertizing technology in road construction, the quality of prepared road surfaces has increased. To improve road surfaces, the ‘appertizing technology’ is used in technological and economical processes, where various materials for the application of apertizing are placed on the road surface. For preparation of new roads, excavation of road surface and decomposition of the road surface layer by means of chemical means are used. Earth, pebbles, gravel, soil, stone, asphalt, concrete, bitumen, asphalt, thermoplastic using apertizing technology are applied on the road surface. The aesthetical, technical and economical character of using appertizing materials and technologies on application of road pavements are evaluated. (orig.) With full text (HTML) d2c66b5586