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In this paper, a 1D dynamical model with substrate resistance was imposed with three frequencies of displacement amplitudes with two amplitudes with frequencies in the resonant region. If the external excitation is treated as a continuous periodic real function with two variables (the basic oscillation period - the first and the ratio of the frequency of the external excitation and the response of the model - the second) then we can present the final solution of the motion of the 1D model in conjugated complex form. Applying FFT algorithms with MathCAD, the treated displacement amplitudes in the frequency and time domains respect the mapping suggested by the transfer function (I.M. Miličić, 2015) and with a smaller number of order members. Computer simulations confirmed that the harmonic response of a 1D dynamic model system can be successfully modeled based on the equivalent solution which shown here.

In this paper, an excitation with two different frequencies of displacement amplitudes outside the resonant region is imposed on a 1D dynamic model with resistance of the substrate. Applying FFT algorithms with MathCAD applications, are treated displacement amplitudes in the frequency and time domains respect the mapping suggested by the transfer function (I.M. Miličić, 2015). Conducted computer simulations confirmed that the harmonic response of a 1D dynamic model system can be successfully modeled based on the demonstrated equivalent solution.

In this paper is shown computational modelling one span road structures truss bridge with the roadway on the upper belt of. Calculation models were treated as planar and spatial girders made up of 1D finite elements with applications for CAA: Tower and Bridge Designer 2016 (2nd Edition). The conducted computer simulations results are obtained for each comparison of the impact of moving load according to the recommendations of the two standards SRPS and AASHATO. Therefore, it is a variant of the bridge structure modeling application that provides Bridge Designer 2016 (2nd Edition) identical modeled in an environment of Tower. As important information for the selection of a computer applications point out that the application Bridge Designer 2016 (2nd Edition) we arent unable to treat the impacts moving load model under national standard - V600. .