Test Research On Bridge Impact Coefficient

The dynamic response of a bridge structure under the action of moving vehicles isone of an important content to study the dynamics of bridge structure. In the movingvehicle load, the increment of deformation and stress of the bridge was obviously higherthan that of the deformation and stress of bridge under static load. With the rapiddevelopment of our economy and transportation business, the number of cars and carweight has the very big enhancement. Under the effect of overloading, high-speeddriving shock response of the structure of the bridge, more and more get the attention ofthe bridge researchers.Dynamic load test is an important method to analyze the bearing capacity anddynamic response of bridge structure. Bridge dynamic parameters including the bridgedynamic characteristics parameters and dynamic response of Bridges, the Bridgesdynamic characteristic parameters include: natural frequencies, mode shapes anddamping, etc. and bridge dynamic response parameters mainly include: dynamic stress,dynamic strain and acceleration, etc. Taking a case analysis of the measured bridge, theexperimental process of the paper analyzes the dynamic load test and matters needingattention, and puts forward some Suggestions for improvement.Whether it is in bridge design or in bridge bearing capacity evaluation, impactcoefficient is a very important parameter. In bridge bearing capacity evaluation, thebridge of the dynamic amplification effect generally in the form of impact coefficient inthe test report, analysis and research impact coefficient appears especially important. Byusing large number of collected dynamic test report about the simply supported girderbridge, continuous beam bridge and arch bridge, sort out the data of each bridge’smeasured frequency and measured impact coefficient. To research and analyze themeasured data, contrast analysis of the influence of various influence factors on theimpact coefficient of influence degree and the trend. Using statistical analysis software,the fundamental frequency and the measured data were fitted by regression envelopecurve equation of impact coefficient, and comparative analysis in subsection regressionanalysis under different bridge regression analysis respectively, and so on and so forth,it is concluded that the return of the envelope curve equation. Will get impactcoefficient of envelope curves and comparing the existing specifications formula, it isconcluded that the impact of the optimization coefficient approximate calculationformula, the hope can provide design and bearing capacity evaluation of similar Bridgeswith some reference.