Sensor distribution method for bowstring arc bridge structure made of special-shaped steel tube concrete

Abstract

Provided is a sensor distribution method for a bowstring arc bridge structure made of special-shaped steel tube concrete. After an integrated finite element model in a full-bridge structure is established and a refined submodel of an inverted triangle rigid frame and a concrete-steel composite beam is built and incision boundary nodes of the submodel of the inverted triangle rigid frame and the concrete-steel composite beam are defined, structural response analysis is performed on the integrated finite element model with the full-bridge structure to determine vulnerability of an integrated stress construction member and monitoring content and monitoring positions on a structural stress integrated analysis layer. Values of freedom degrees of boundary nodes of the integrated model are obtained and inserted on the incision boundary nodes of the refined submodel, and the structural response analysis of the refined submodels is performed sequentially so as to determine the monitoring content and the monitoring positions on the refined submodels of the inverted triangle rigid frame and the concrete-steel composite beam. Compared with a traditional sensor distribution method, the method can accurately solve the problem of distributing sensors on the special-shaped steel tube concrete structure at complex stressed portions and guarantee robustness, effectiveness and economic rationalization of a health monitoring system.

Description

technical field [0001] The invention belongs to the field of bridge structure analysis and structure monitoring system design in bridge engineering, and in particular relates to the optimized layout and monitoring strategy of the structural health monitoring sensor measuring points of a long-span special-shaped steel pipe concrete tied arch bridge. Background technique [0002] The basic monitoring function of the structural health monitoring and safety evaluation system is realized by the sensor system, and the reasonable arrangement of sensors is the premise to ensure the quality of structural monitoring. At present, the distribution of bridge monitoring sensors is mostly based on experience. For complex structures such as special-shaped tie rod steel pipe arch bridges, experience cannot guarantee the quality of sensor distribution. Generally speaking, sensors should be arranged at stress concentration points, structural support points, components that have a relatively la...

AI Technical Summary

Problems solved by technology

Therefore, it is impossible to make an accurate analysis of the local stress state

The overall structure analysis can meet the requirements of the overall behavior monitoring sensor layout of the structure, but it is difficult to meet the requirements of the local behavior monitoring sensor layout and the safety assessment requirements of complex structures

[0005] At present, bridge health monitoring systems at home and abroad are mainly for long-span cable-supported extra-large bridges, and there are fewer health monitoring systems for tied arch bridges and prestressed concrete bridges.

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