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Analihz osoblivostejj prostorovoji roboti bezdihafragmovoji prol'otnoji budovi

Sobko J.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

2000

z. 32[180], cz.1

485-492

The purpose of this investigation was to study and analyze the specificity of space work of diaphragmless of beam-and-slab bridge span structure. The experimental investigation consisted study the behavior of simply supported 1:4 scale RC bridge of diaphragmless model. The model had six tee beams joined together by longitudinal cast-in-situ concrete joints with reinforcement laps. The beam were placed adjacent to each other on the end supports, then the longitudinal strands were threaded through the reinforcement laps. The joints between the beams were filled with Portland cement fine grain concrete. Dynamometers, dial gages and tensoresistors were used for measuring the support reactions, vertical deflections and strains. The TA-2 tensometers were installed at midspan to measure the strain in concrete and reinforcement too. The finite elements method was used to analyze the 1:4 scale model of beam-and-slab bridge deck. The continuous form of the deck is replaced by FE model. This model consist of four-node flat plate FE elements of highway plate and one-dimention two-node FE elements of T-beam webs which together make up a slab reinforced by a set of equidistant ribs of stiffness. The 24-th degrees of freedom flat FE and 12-th degrees of freedom one-dimention FE was connected by intermediate rigid inserts along local axis Z1. The loading on the FE model was applied in the form of scaled down concentrated load orthogonally to the horizontal plane of deck at nodal points. The method of elastic supports was used to analyze the bridge model too. A comparison between experimental and analitical bending moments at midspan for edge beam was made. The FEM analysis provides good correlation with the test results. The comparison of experimental bending moments and those obtained from elastic supports method showed that diference. It was established that the nonacounted by elastic calculation reserve of strength of diaphragmless beam-and-slab bridge spans is 14.5 percent.