Modeling of cable-stayed bridge and modal analysis

Abstract

Problem. The considered Characteristics of the own forms of a cable-stayed bridge according to several of its schemes. The analysis of the influence of the type of resistance on the characteristics of the own forms of resistance for different sets was carried out. Among the types of resistance, full rigidity, hinge and no resistance were taken. Goal. The purpose of the study is to determine the causes of registered traffic accidents and emergencies associated with them. To do this, it is proposed to analyze the own forms of the cable-stayed bridge for various types of its contact (resistance) with the columns. The object of the study is a cable-stayed bridge with a service life of about 50 years. The bridge is a system of three types of elements: pylon, span and columns. The subject of the study is the forms of natural oscillations of the bridge according to its various models. Methodology. The study was carried out by using oscillation and finite element methods. It should also be noted that the original methods for constructing models of complex machine-building systems were used, which were developed directly by the author. Results. Based on the results of the research, three-dimensional finite element models of parts and the entire bridge as a single system for various types of resistance were built, and their own forms were obtained for each model of the system. The study allows us to draw conclusions on specifying the causes of road traffic accidents and ways to prevent them. Originality. Regarding the methods of constructing models of a cable-stayed bridge, we note their uniqueness. Taking into account the features of modeling, it became possible to create several states of interaction between the parts of the system. To conduct reliable research for a real model of a structure, it is necessary to have reliable data about the real state of the connections of its elements. This state can range from absolutely rigid to free. Accounting for these features is possible with the help of a unique author's methodology for building models using the universal capabilities of the finite element method. Previous studies of the bridge by other methods did not allow us to solve the tasks set for the occurrence of traffic accidents. Practical value. The results of the work have direct practical application. Based on the results of the work, conclusions were drawn about ways to improve the reliability of the system and the measures to prevent traffic accidents.