Method for evaluating operation comfort of large-span common-rail cable-stayed bridge on same floor based on deformation monitoring

Abstract

The invention provides a method for evaluating the operation comfort of a large-span common-rail cable-stayed bridge on same floor based on deformation monitoring, and relates to the field of bridge operation. A comfort evaluation index is represented by a vertical acceleration and a transverse acceleration, and is verified by an index Sperling index; a maximum vertical deformation response value S and a maximum transverse deformation response value H of the main beam are determined according to monitoring technical means such as a GPS system and a Beidou system; according to the technical methods of bridge structure finite element model analysis, axle coupling vibration analysis and the like, the vertical deformation limit value Smax and the transverse deformation limit value Hmax of a main beam are determined through calculation of the relation between the operation comfort and the rigidity change of the main beam; according to vector calculation of the response value and the limit value, operation comfort evaluation is achieved; and an evaluation conclusion is formed, and an operation maintenance decision suggestion is proposed.

Description

technical field [0001] The invention relates to the technical field of bridge operation, in particular to a method for evaluating the operating comfort of a long-span public rail cable-stayed bridge on the same floor based on deformation monitoring. Background technique [0002] Cable-stayed bridges are cable-supported flexible structural systems. Under the action of vehicle loads, temperature loads, wind loads, etc., the main girder has large space deformation and significant load response. In addition, due to the intricate influence of material variation, prestress loss, and cyclic loads , the main girder presents non-recoverable deformation, which greatly affects the operating comfort, and in serious cases, endangers the operating safety, especially for cable-stayed bridges with long-span public rails on the same floor, and the evaluation of operating comfort is more complicated and severe. [0003] At present, the urban rail transit bridge design code only stipulates the...

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Problems solved by technology

[0002] Cable-stayed bridges are cable-supported flexible structural systems. Under the action of vehicle loads, temperature loads, wind loads, etc., the main girder has large space deformation and significant load response. In addition, due to the intricate influence of material variation, prestress loss, and cyclic loads , the main girder presents non-recoverable deformation, which greatly affects the operating comfort, and in serious cases, endangers the operating safety, especially for cable-stayed bridges with long-span public rails on the same floor, and the evaluation of operating comfort is more complicated and severe

[0003] At present, the urban rail transit bridge design code only stipulates the deformation limit value for each load separately, and does not stipulate the uniform stiffness limit value under the load combination. Under the simultaneous action of the static and live load of the road, the vertical deflection of the structure should not be greater than 1 / 500 of the calculated span. Therefore, when analyzing the operating comfort, the deformation limit specified in the code cannot be applied, and there is a technical bottleneck

On the other hand, at this stage, acceleration sensors are directly arranged on the trains, and the train acceleration is obtained through information collection, analysis and processing, but the effect is not satisfactory, and the structural monitoring system, which is commonly installed on long-span bridges and is becoming more and more mature, cannot be effectively utilized. Leading to different degrees of increase in evaluation procedures and investment quotas

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