The purpose of this study is to determine the rational use areas of various computational models types while dynamic analysis. This topic is relevant because of the need to carry out precise dynamic calculations for structures at the high-speed rail, in order to ensure the design of a reliable structures. The object of the study is a single-span girder for the high-speed rail. Research methods are numerical analysis using various models; modal calculation of the oscillation shapes and frequencies; comparative analysis. The result of this study are recommendations on the areas of rational use of various types of models.

No abstract

One of the most stable trends is the use of multi-component solutions in the practice of bridge construction, one of which is the use of rigid reinforcement elements in bridge girders and decks. The purpose of this work is to assess the possibility of using filler bridge girders on the Russian railway network and determine the scope of their effective application. In the course of the study, the analysis of design solutions was carried out taking into account foreign experience in design and operation and the study of relevant regulatory documents. Also in the course of the work, a comparison of the cost indicators of rigid-reinforced girders and the existing standard projects of the reinforced concrete and steel simple beam bridges was performed. The results of the study are presented by the formed list of the main advantages and disadvantages of girders with rigid reinforcement and the definition of the area of their most effective application. The practical significance of the work is because steel-concrete girders with rigid reinforcement are the most effective solution for the short span bridges up to 15 meters length from both technical, operational and economic sides. The proposed solution allows reducing the resource intensity of the construction and labor costs for its construction and maintenance.

No abstract

Purpose: Accounting for dynamic nature of the effects of forces from a rolling stock on a bridge taking into account passway roughness in high-speed traffic conditions in the calculation model “Moving Dynamic Forces on the Beam”. Methods: Derivation of the differential equations of the proposed system by analytical method. Results: Equations for determining the magnitude of the inertia forces X1 and X2 of a rolling stock sprung part. Practical importance: Obtaining the updated picture of bridge structure dynamic operation in high-speed traffic conditions by the way of change of “Moving Forces on the Beam” calculation model to “Moving Dynamic Forces on the Beam” model.