Abstract
ABSTRACT A simplified methodology is proposed for the dynamic analysis of curved road bridges under the effect of a 3C class heavy vehicle. The dynamic models of both vehicle and bridge are considered to be uncoupled, being bound by the interaction forces. These forces come from the vehicle dynamic analysis, initially under rigid deck, subjected to a support excitation caused by the pavement geometric irregularities. Such forces are statically condensed in the vehicle centre of mass and applied to a simplified structural model (‘unifilar’) of a curved bridge with box girder section, considering the bridge super elevation. The influence of the rigid deck hypothesis on the dynamic response is assessed by an iterative procedure, in which the deck displacements are added to the pavement irregularities, to obtain an “equivalent irregularity” function. The new interaction forces are re-applied to the bridge model to determine new displacements, repeating the procedure until the results converge.
Highlights
Road bridges are important elements of a country’s infrastructure, influencing its socio-economic development associated with road transport, especially in countries with deficiency in others types of transport, such as rail. (Santos [1]) The development of the road traffic in Brazil led to an increase in its volume and weight of vehicles
A simplified methodology is proposed for the dynamic analysis of curved road bridges under the effect of a 3C class heavy vehicle
The dynamic models of both vehicle and bridge are considered to be uncoupled, being bound by the interaction forces. These forces come from the vehicle dynamic analysis, initially under rigid deck, subjected to a support excitation caused by the pavement geometric irregularities
Summary
Road bridges are important elements of a country’s infrastructure, influencing its socio-economic development associated with road transport, especially in countries with deficiency in others types of transport, such as rail. (Santos [1]) The development of the road traffic in Brazil led to an increase in its volume and weight of vehicles. (Santos [1]) The development of the road traffic in Brazil led to an increase in its volume and weight of vehicles The combination of these factors with the development of increasingly slender structures and track irregularities characteristics, leads to an important variation of the stress amplitudes and amplification of the vibration frequency spectrum, these being relevant factors for the deterioration and reduction of the lifespan of road pavements and structures. The first studies on dynamic problems date from 1849 and it is an approach of Willis [3]: an equation of motion was deduced based on a model formed by a mass, moving with constant velocity on a massless and flexible -supported beam. In Brazil, such a model was employed by Bruch [9] to the analysis of the dynamic behaviour of rectangular plates with moving load; by Carneiro [10] for the analysis of beams with various support conditions, using stiffness and damping matrices variable with the vehicle position; and by Ferreira [11] to verify the effects of moving loads on the road bridge decks
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