DYNAMIC CHARACTERISTICS FOR TRANSPORT STRUCTURES WITH ELASTIC SUPPORTS

Currently, the issues of strengthening the load-bearing capacity of transport structures under the action of dynamic loads are becoming increasingly relevant. To ensure a reserve of structural strength under dynamic impacts, active methods of protection are increasingly being used. The use of active methods of protection in the form of pliable supports makes it possible to increase the energy intensity of the “support-structure” system and reduce the intensity of the dynamic impact. They play the role of dampers, reducing vibration amplitudes and absorbing deformation energy. The dynamic characteristics of transport structures play a significant role in the oscillatory process, because the resistance of the structure to external influences depends on them. By changing them, you can lower the value of the dynamic coefficient, thereby reducing the dynamic effect. The aim of the research is to evaluate the influence of the stiffness of the support links of transport structures on the dynamic characteristics of road overpass spans. To determine the natural frequencies, a homogeneous partial differential equation is used, the solution of which is presented using hyperbolic functions. The solution of the transcendental equation is obtained using the approximation method. The relevance of the obtained results lies in the fact that when using elastically supple supports in transport structures it is possible to change dynamic characteristics and thereby increase the strength reserve and reduce the dynamic effect.