Bridge Structure Impact Factor Influencing Factors Research And Expeirmental Analysis

The bridge impact coefficient refers to the bridge structure Dynamic augmentationeffect when moving load is passing through the bridge. it is an important index ofdynamic performance evaluation of bridge structure driving. Engineering practice oftengauge theory calculated and measured impact coefficient to evaluate the structure’ssafety performance and comfort, and both the size of the money play an important rolein the bridge carrying capacity assessment. For normative theory between calculatedvalue and the measured impact coefficient discussed differences seem is particularlyimportant. Specification is considered for theoretical calculation of the impactcoefficient of a single factor, while the influence of the measured impact factorinfluencing factors tend to be more complex.Article on the basis of a large number of measured data, Through the statisticalanalysis of beam bridge, continuous steel bridge and arch bridge impact coefficient andinfluence factors, Study on the vehicle-bridge coupling, surface roughness, vehiclespeed, calculation method, damping ratio, dynamic loading efficiency, span andrise-span ratio of arch effects on the bridge impact coefficient. The analysis results showthat the surface roughness and the difference of vehicle-bridge coupling for the bridgeimpact coefficient plays the decision role. The impact coefficient and velocity haveobvious relevance. its value changes due to bridge differences are different, and theimpact coefficient peak speed is in30km/h~40km/h. Standard calculation method usingthe peak to peak value calculation of impact coefficient sometimes there will be random,While the impact coefficient using digital filter has good stability calculation; Themeasured bridge structural damping is relatively small, the bridge once the frequencycoupling, and its knock-on effects will be very significant. Arch Bridge ImpactCoefficient with span ratio decreases was an increasing trend.At the same time, through the comparison of the measured data and the standardvalue, article discusses the rationality of the existing norms calculation of impactcoefficient and Points out the deficiency of existing code calculation of impactcoefficient. Finally, the regression based on the measured data, the comparison with theactual law of experience formula, the formula can be applied to engineering practice.