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.
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