Arrangement method of supports of continuous box girder bridge

Abstract

The invention relates to a planar arrangement method of supports of a continuous box girder bridge. The planar arrangement method comprises the following steps: calculating anti-thrust rigidities at the tops of bridge piers according to the geological conditions at the positions of the bridge piers and the lower structures of the bridge piers, calculating a stationary point (S.P.) of a box girder according to the anti-thrust rigidity of each pier, calculating horizontal force at the top of each pier according to constant-load support reaction force R at the top of each bridge pier, calculating the maximum horizontal displacement at the top of each bridge pier when the supports slide, calculating shrinkage deformation amount of each bridge pier, arranging a fixed support at the bridge pier which is closest to the stationary point (S.P.), if the other bridge piers meet the condition, arranging fixed support saddles at the other bridge piers; otherwise, arranging one-way sliding supports. According to the method disclosed by the invention, the longitudinal anti-thrust capability of a large longitudinal slope bridge can be improved, the resisting force of the bridge piers can be indirectly improved, the transverse position-limiting capability of the bridge can be improved by 2-4 times, and the transverse slippage of a curved bridge and a large transverse slope box girder can be effectively prevented; and a stress system of the original structure and the bearing force of the supports are not changed in the method, the stress system can be effectively utilized, and the cost is not increased.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a support plane arrangement method of a continuous box girder bridge. Background technique [0002] Bridges move under the action of temperature changes, elastic strains caused by various loads, especially traffic loads. In ancient times, bridges were built of stone, brick or wood. The expansion and contraction of most stone bridges was little affected by temperature fluctuations. The wooden bridges were small in scale and had natural cracks. The expansion and contraction of the entire bridge was scattered due to the expansion and contraction of each part. Therefore, the ancient bridge can have no support. But in modern times, with the use of steel structures and later reinforced concrete and prestressed concrete, bridge bearings have been widely used. [0003] Bridge supports are generally divided into fixed supports and movable supports. The fixed supports not only fix the ...

AI Technical Summary

Problems solved by technology

The disadvantages of this arrangement method are: ① Some bridge piers are installed with sliding bearings and will not slide, and the sliding bearings do not play their due role; ② Due to the installation of sliding bearings, the thrust stiffness of the bridge piers is reduced

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