Dynamic load and chlorine salt erosion coupled facade zoning corrosion pier damage degree evaluation method

Abstract

The invention provides a dynamic load and chlorine salt erosion coupled facade zoning corrosion pier damage degree evaluation method, which comprises the steps of preparing an RC offshore bridge piertest piece, and dividing regions, carrying out electrochemical accelerated corrosion to form corrosion rates of all regions of the test piece at different service moments, and measuring the concentration distribution condition of chloride ions in the test piece, screening a plurality of seismic oscillations for excitation based on the seismic activity characteristics and the acceleration responsespectrum design form of the area where the pier prototype is located, and measuring the time-varying displacement of the top of the test piece and the time-varying vertical relative displacement alongthe pier body direction, and judging a pier failure mode and a plastic hinge generation position according to the measurement data and the damage distribution, calculating a displacement ductility ratio and a curvature ductility ratio of the test piece under earthquake excitation, and evaluating the damage degree. According to the method, the performance degradation characteristics of the bridgepier in a complex marine environment can be accurately reflected, meanwhile, the damage degree judgment method considering the pier top displacement and multi-region curvature change characteristics is established, and the anti-seismic property degradation rule of the offshore bridge pier is accurately disclosed.

Description

Technical field: [0001] The invention belongs to the technical field of seismic performance evaluation of offshore bridge piers, and in particular relates to a method for evaluating the damage degree of facade partition corrosion piers coupled with dynamic load and chlorine salt erosion. Background technique: [0002] Offshore bridges are an important link for the flow of people and logistics in coastal areas. Due to the high salinity and high humidity sea erosion environment, the risk of corrosion damage and collapse of offshore bridges is much higher than that of inland structures. In addition, due to the tide and wave action of seawater, the offshore bridge structure can be divided into atmospheric area, splash area, tidal range area and submerged area in the whole facade height, and the concentration of chloride ion on the concrete surface in different areas and the splash area and tidal range The dry-wet cycle in the area will lead to significant performance degradatio...

AI Technical Summary

Problems solved by technology

However, if considering the characteristics of structural performance degradation caused by corrosion during the long-life service period of offshore bridge piers, especially the more serious corrosion phenomena in the splash zone and tidal range zone, the plastic hinge of the structure may be transferred from the bottom of the pier to the splash zone under earthquake action. area and tidal range area, where structural damage significantly different from the design conditions occurs

[0005] In this case, the traditional single index of displacement ductility ratio or curvature ductility ratio cannot reasonably reflect the plastic hinge transfer and earthquake damage of zonal corroded offshore bridge piers under earthquake action. Analysis and evaluation of the degree of damage

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