Research Of Bridge Deflection Measurement Based On Wireless Inclination Sensors

In our country,dial indicator or displacement meter are mostly used in maintenance ofbridges,safety assessment of old bridge and acceptance of new bridges.These two methodshave the advantages.for example,equipments are simple,multi-point detection can beperformed,the value of the deflection can be obtained directly,and the measurement resultsare stable and reliable.However,direct measurement method requires steel wire to bedrawn,and shelves to be erected at each measured point.And detection can not be performedwhen there is water under the bridge.When impacted by rail or road traffic gauge,overpassand takahashi across canyons and other terrain can not be measured using the directmethod.And the layout and withdrawal of instrumentation are complicated andtime-consumingThis paper systematically introduces a bridge deflection detection method.Anglesensors are routed on a selected number of measurement points in the axis parallel to theaxis of the bridge,and angle changes are obtained after loading The dynamic deflection orstatic deflection of any point on the axis can be obtained by calculating.Measuring andmodeling analysis indicates that this method is suitable for simply supported beams andcontinuous beams under the action of dynamic and static load,and the precision is quitehigh.Using wireless inclination angle sensor does not require a stationary reference pointbridge,particularly suitable for measuring across canyon bridge,cross sea bridge andtakahashi,and the measurement efficiency has been greatly improved.This article mainly research contents and the main achievements are as follows:1．A comprehensive review of the current domestic and international deflectionmeasuring research status and recent developments has been given.The commonly usedmethods,such as dial indicator method,level method and total station method, in bridgedeflection measurement have been introduced,and advantages,disadvantages and applicableconditions of these methods have been analyzed comparatively.On this basis,the object ofthis paper-based on wireless inclination angle sensor to measure bridge deflection.2．According to the inclination angle of the measured point,use cubic spline functionto derive the equation for solving deflection.3．According to the aforementioned equation,write the solving program is written byusing Matlab.In order to improve convenience of the program,a deflection-calculating GUI interface has been produced based on Matlab.4．Establish Ansys finite element models of a reinforced concrete beam bridge and athree-span variable cross-section continuous rigid frame bridge.Loads are applied at variouslocations of the model to simulate real bridge under the action of load,and then solve themodel.contrast deflection solved by Ansys and deflection values calculated in accordancewith angle,and determine whether the error is within reasonable limits...