A simplified method to estimate the fundamental frequency of skew continuous multicell box-girder bridges

AUTOR(ES)

Mohseni, Iman, Rashid, Abdul Khalim Abdul, Kang, Junsunk

FONTE

Lat. Am. j. solids struct.

DATA DE PUBLICAÇÃO

2014-08

RESUMO

Here Fundamental Frequency is the main factor used to calculate the vibration of a vehicle when passing across a bridge. With knowledge of the fundamental frequency, bridges can be evaluated and designed in such a manner so as to avoid the critical range of 1.5 Hz to 4.5 Hz, which is occupied by most vehicles. Therefore it is crucial to develop a reliable method to estimate the fundamental frequency of bridges. To overcome the above issue, numerical analysis combined with a theoretical method is applied to estimate the fundamental frequency of multicell box-girder bridges. The effect of span-length, number of boxes and skew angle on the estimation of this factor is discussed. Finally, reliable expressions are proposed to predict the first fundamental frequency of this type of bridge, and the accuracy of the expressions is verified. The results indicate that the fundamental frequency decreases when span length increases, due to development of crack as well as decrease stiffness of girders.

Documentos Relacionados

• Protensão em pontes celulares curvas.
• Transverse load distribution of skew cast-in-place concrete multicell box - girder bridges subjected to traffic condition
• A laboratory method to estimate the efficiency of plant extract to neutralize soil acidity
• A rapid method to estimate Westergren sedimentation rates
• Using a Clinical Data Repository to Estimate the Frequency and Costs of Adverse Drug Events