Rapid estimation method for natural vibration frequency of steel-concrete composite continuous beam bridge

Abstract

A rapid estimation method for the natural vibration frequency of a steel-concrete composite continuous beam bridge relates to a natural vibration frequency estimation method. According to basic parameters of a bridge, n-order natural vibration frequencies of a single-span steel-concrete composite beam under two boundary conditions, namely, simple support at two ends and simple support at one end and consolidation at the other end, are calculated, and according to the calculated natural vibration frequencies of the single-span steel-concrete composite beam under the two boundary conditions, parameters k and gamma are introduced to quickly calculate the multi-order natural vibration frequency of the continuous beam bridge. According to the method, the multi-order natural vibration frequencyof the uniform-section equal-span steel-concrete composite continuous beam bridge can be rapidly estimated, and the method has very remarkable advantages under the condition of limited calculation means.

Description

technical field [0001] The invention relates to a method for estimating the natural frequency, in particular to a method for quickly estimating the natural frequency of a steel-concrete composite continuous girder bridge, which belongs to the technical field of bridge engineering. Background technique [0002] With the overcapacity of steel in my country, the transportation industry is vigorously promoting the development of steel structures and steel-concrete composite structures. Compared with concrete bridges, steel bridges and steel-concrete composite beam bridges have the advantages of green environmental protection, safety and durability. Steel has better tensile properties, and concrete has better compressive properties. For small and medium-span girder bridges, if steel structures are used entirely, the fatigue problem will be particularly obvious due to excessive vibration, which will greatly reduce the service life of the bridge structure. Between the structure and...

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Problems solved by technology

[0006] In order to solve the deficiencies in the background technology and to solve the problem of complex calculation of the natural frequency of steel-concrete composite continuous girder bridges with equal cross-section and equal span, the present invention provides a method for quickly estimating the natural frequency of steel-concrete composite continuous girder bridges, which can quickly Estimating the multi-order natural frequency of steel-concrete composite continuous girder bridges with equal cross-section and equal span has a very significant advantage in the case of limited calculation methods

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