Bridge cross connection real-time assessment method based on stress proportion

Abstract

The invention relates to a bridge cross connection real-time assessment method based on the stress proportion. The method comprises the steps of obtaining stress values of a midspan beam bottom through a stress sensor in real time, calculating the actually-measured stress proportion of each beam, taking the actually-measured stress proportion as stress proportion actually-measured values, utilizing a numerical simulation technology for damage simulation, obtaining the change tendency and range of the stress proportion of the beams when different cross-connection parts are damaged in varying degrees under the health state, taking the change tendency and range of the stress proportion as the stress proportion calculating values, comparing actually-measured values with the calculating values, and therefore identifying the cross connection damage of the structure. The method has the advantages that a fiber bragg grating stress monitoring system is combined, so that the monitoring precision is greatly improved, according to the stress proportion index, the false alarm rate is low, the real-time structural health assessment is provided, and the structure monitoring continuity is good. Compared with a traditional structure health assessment means, a static load test is not required, normal traffic is not disturbed, cost is low, precision is high, real time performance is good, and the method is suitable for monitoring various small and medium-sized span fabricated bridges.

Description

technical field [0001] The invention relates to a real-time evaluation method for bridge transverse connections based on stress specific gravity. Background technique [0002] In recent years, health monitoring and damage identification of girder bridges have been extensively studied. Chinese patent application 200910053434.7 proposes a method for evaluating the bearing capacity of eccentric linear prestressed concrete beam bridges based on the dynamic measurement method. The bridge structure is forced to vibrate to obtain the single-point vibration response. Structural health status identification and bearing capacity assessment. Chinese patent application 201210062742.8 proposes a method for evaluating the damage degree of hinge joints of slab girder bridges, using the relationship between the relative displacement of the hinge joints, the shear force of the hinge joints, and the stiffness of the hinge joints, according to the load size, position and The shear force and ...

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Problems solved by technology

This kind of damage assessment technology and means need to rely on independent physical quantity monitoring devi

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