In this paper, we studied the natural oscillations in the vertical and horizontal surface of viaduct of Ivanci. A number of schemes which allow determining the frequency on a more simple dependencies are given
The article, using the example of a three-flight irregular beam, studies the influence of irregularities of linear, stiffness- and mass-related parameters on the change of own frequencies. It has been shown that at certain parameters of irregularity it is possible to use in practical calculations simple solutions for regular schemes, the obtained approximated dependences, charts and nomograms.
In this paper on the example of continuous spans of bridges the asymmetry influence of the scheme on the frequency and forms of natural oscillations is investigated. It is shown that under certain span lengths of regular schemes the use of them to determine the span frequencies is possible.
The article is devoted to the possibility of replacement of complex inseparable irregular bridge structures by their regular counterparts, with minimal errors in definition of the own frequencies. The analysis has been performed on a real five-span bridge structure, designed under a 66 +126 +147 +115 + 76 – meter scheme.
The article considers the questions of defining the actual rigidity of bridge supports and arising in some cases necessity of replacement the absolutely rigid supports for resilient ones in calculation of the own frequencies of bridge designs.
In work on the example of three-flight irregular beam on resilient supports influence of the once-personal on inflexibility resilient supports is probed on a regular beam, and influence of different stiffness of resilient supports (identical between itself) is similarly probed on a beam, irregular on lengths of flights. It is shown that at the certain parameters of irregularity in practical calculations it is possible to utilize simple solutions for the regular systems, got close dependences, graphs
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