Year: 2023
Type: article
Abstract: The development and reconstruction of the transport infrastructure of cities and their agglomerations cannot be imagined without pedestrian overpasses. They allow you to increase the throughput of roads with a relatively small investment, while ensuring complete safety of pedestrian traffic. The span structures of pedestrian bridges are relatively light in comparison with road spans, which makes them sensitive to dynamic influences of various nature, as well as to simplifications and neglects generally accepted in engineering calculations.As confirmation of this assumption, the paper presents the results of testing three pedestrian bridges built in 2009–2012 in the Far East region. The test results substantiate the proposed concept of regulation of the dynamic characteristics of span structures. The essence of the concept is the use of polymer bearing parts with a given shear stiffness and damping properties, which makes it possible to effectively control the dynamic characteristics of the span. It is proposed to use polyurethane of various grades as the base material.Due to the lack of reference data on the physical and mechanical characteristics of polyurethane of various stiffness (hardness), experimental laboratory studies were carried out, as reflected in this article. As part of the experiment, three series of bearing parts were made from rubber and polyurethane of various grades. As part of the experiment, three series of bearing parts were made from rubber and polyurethane of various grades. As a result of the study, the shear modulus values of interest to us for the tested materials were obtained. In addition, during dynamic tests, signs of high dissipation of polyurethane were revealed compared to rubber used in bearing parts, which confirms its effectiveness as a damping element in a pedestrian superstructure.The materials presented in the article substantiate the practical significance of the study, and the results obtained will be applied in modeling bearing parts for real objects.
Authors: A. V. Lapin, I. Yu. Belutskiy, L. V. Marygina
Institution: Pacific National University
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7141292995