Split type box girder capable of adjusting ventilation rate between grooves

Abstract

The invention discloses a split type box girder capable of adjusting ventilation rate between grooves. The split type box girder comprises two box girders, at least one open groove formed between the two box girders and at least one cross beam connected with the two box girders, a ventilation rate adjusting device is arranged at the position of the open groove, and the ventilation rate adjusting device comprises at least one ventilation rate adjusting mechanism arranged in the longitudinal direction. The ventilation rate adjusting mechanism comprises two supports oppositely arranged in the longitudinal direction, a plurality of fender plates arranged between the two supports in the transverse direction at intervals and two driving devices arranged on the two supports respectively, and the two driving devices drive the fender plates to rotate and move horizontally. The ventilation rate adjusting mechanism is fixed in the open groove between the two box girders, under the driving condition, the ventilation rate between the grooves is reduced or the ventilation rate between the grooves is adjusted alternately in the spanwise direction so that vortex vibration can be eliminated, the driving comfort and safety can be guaranteed, under the potential flutter condition, the ventilation rate between the grooves is adjusted to the maximum, and the ventilation rate between the grooves can be adjusted to the maximum. Therefore, the requirement of bridge flutter stability performance is met.

Description

technical field [0001] The invention relates to the technical field of bridge structures, in particular to a split-type box girder with adjustable ventilation rate between slots. Background technique [0002] With the increase of bridge span, wind-induced vibration has gradually become one of the factors that must be considered for long-span bridges. The main forms of wind-induced vibration can be divided into flutter, eddy vibration and buffeting. Flutter is a phenomenon of bridge aeroelastic instability, manifested as torsional single degree of freedom or divergent vibration coupled with bending and torsional degrees of freedom under high wind speed, once it occurs, it may cause bridge structure collapse and damage. Vortex vibration is a kind of wind-induced vibration phenomenon that is easy to occur at low wind speeds. However, since the vibration of the structure will form a certain feedback effect on the vortex shedding at this time, the aerodynamic damping gradually c...

AI Technical Summary

Problems solved by technology

At present, the commonly used method is to determine the ventilation rate between the slots during construction, but it cannot be adjusted in the subsequent use process, and the flutter and vortex control cannot reach the optimal solution at the same time, so it is necessary to combine the specific wind conditions to determine the adopted method. measure

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