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The paper presents the results of experimental research conducted on the newly constructed post-tensioned pre-stressed concrete road bridge situated over water plant of water reservoir under dynamic field load tests in Topola village (Poland). The dynamic loads consist of four heavy trucks passing at different speeds, through threshold and braking at the midspan. The obtained results from field load tests and the calculation of dynamic coefficients, values of amplitudes of vibration velocities and frequencies of two bridge spans have allowed to assessment of effectiveness of structural solutions applied at this bridge and establish some guidelines for using of this type of construction process in design structural solutions located over water plants in the future engineering practice. Wide range of conducted dynamic tests have allowed for comprehensive evaluation of the concrete elements effort of bridge structure. Final conclusions confirmed the observations taken from the research under static load. [ABSTRACT FROM AUTHOR]

This paper concerns the problem of ground vibrations induced by road traffic and its influence on nearby historical monuments. The influence of vibrations induced by road traffic on buildings of St. Catherine's church was studied, this church lying in Warsaw, near a heavily used street. The measurements of vibrations of soil and walls of the church were executed using standard, 10 Hz, seismic, three-component geophone stations. Measuring points were established along chosen profiles between the street and the church. Interpretation of the obtained vibration records permitted to trace road-traffic- induced vibrations to the church wall with a velocity in the range characteristic of surface seismic waves and to quantify the range of the frequency and acceleration of the vibrations of soils and walls of the church. These results were compared to the Polish construction norm PN-85/B -02170 (title: "Evaluation of the harmfulness of building vibrations due to ground motion"). In effect, the recorded and traced vibrations exceeded the norms tolerable for such constructions. [ABSTRACT FROM AUTHOR]