NATURAL OSCILLATIONS OF PLATE-BEAM FLOOR FRAGMENT OF BUILDINGS

Aliawdin P.W., Doctor of Technical Sciences; University of Technology; Szczecin, the Republic of Poland

Muzychkin Yu.A., Institute BelNIIS; Minsk, the Republic of Belarus

Natural oscillation frequencies of a hinge supported fragment for a reinforced concrete flooring consisting of a prefabricated hollow-core slab and monolithic girt beams on the floor contour are analyzed. Both the initial design model of the fragment in the form of a plate-beam structure as well as its simplified model in the form of a rod system is examined. For the simplified model that has the infinite number of freedom degrees, natural oscillation frequencies with account of shearing forces and rotational inertia as well as prestressing in slab are defined. For the initial model, as for a discrete system, modeling of natural and harmonic oscillations on the basis of the finite element method is executed. A full-scale experiment for fragment oscillations at various types of dynamic loads, including shock, harmonic force and perturbation under the random law (white noise) is performed. Analytical and numerical results are compared with experimental data.

Oscillation frequencies, hollow-core slab, monolithic girt beams, shearing force, rotational inertia, dynamic load

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