Modeling of cable-stayed bridge and research of frequency characteristics

Abstract

The frequency characteristics of the cablestayed bridge according to several of its schemes are considered. The analysis of the influence on the frequency characteristics of the type of resistance according to different sets is carried out. Among the types of resistance were taken complete whitening, hinge and lack of resistance. Goal. The purpose of the study is to determine the causes of emergencies, including those recorded as road accidents. For this purpose it is offered to carry out the analysis of natural frequencies of the cablestayed bridge on its different types of contact (resistance) with columns. The object of this study is a cablestayed bridge, which has been in operation for 45 years. The bridge is a system of three types of elements: pylon, span and columns. The subject of the study is the spectrum of natural frequencies of the bridge according to its various models. Methodology. The research was performed using the methods of oscillations and finite elements, as well as the methods developed by the author for building models of complex machine-building systems. Results. According to the results of the performed researches, mathematical threedimensional finiteelement models of parts and the whole system of the bridge were made for different types of resistance, natural frequencies for each system were obtained. The conducted research provided grounds for conclusions on concretization of the causes of emergency situations and directions for their avoidance. Originality. Regarding the type of developed models of the cablestayed bridge, we note their uniqueness. Due to the existing personalities of the models used, it is possible to model three states of interaction of parts of the system. To conduct a study with a high degree of reliability of the real model, you need to have available data on the types of connections of its elements. This is possible with the help of unique author’s methods of model construction and use of universal possibilities of the finite element method. Research of the bridge by other methods did not allow to solve the set tasks on emergence of emergency situations. Practical value. The results of the work have a direct practical application. Based on the results of the work, a conclusion was made on measures to increase the troublefree operation of the system and measures to avoid the occurrence of an emergency situation.