Analysis and Experimental Verification of Vehicle Weighting Coefficients for Continuous Beam
The vehicle weighing method using bridge response has the advantages of low cost,easy maintenance and good durability.Its weighting accuracy depends on the accuracy of the weighting coefficients.Taking a typical three-span prestressed concrete continuous small box girder bridge as the application background,the mathematical expressions correlating vehicle weight and bridge response indices were derived.The definition and theoretical analysis of vehicle weighing coefficients were given,and the correction factor for the lateral position of the weighing coefficients was proposed for actual wide bridges.Secondly,the finite element model of the bridge was established and loaded with random traffic flow of two lanes to extract bridge response.Finally,a bridge weigh-in-motion system and a pavement weigh-in-motion system were designed and installed on the actual bridge to monitor the information of passing vehicles,and the vehicle weighing coefficients under big data statistics were obtained through matching algorithms.Research results show that the theoretical weighting coefficients are consistent with the numerical simulation results,with an error of 1.8％.The measured calibration coefficients are also consistent with the theoretical and numerical simulation results,with an absolute error of 1.73％.The research results provide research ideas for other types of bridges such as simply supported beams and unequal span continuous beams,in order to obtain vehicle weighing coefficients at different positions of the bridge.It is also recommended to cross check the theoretical,simulated and measured weighing coefficients in practical engineering applications to improve the accuracy of calibration.
万方数据
维普
