Research On Limited Load Of Bridge Vehicles In Typical Cities In Hefei

The bridge plays an important role in the modern transportation engineering,especially in the city of human activities that highly populated areas,currently in the country in the design code of Bridge Lane load specific value,resulting in domestic bridge load limit value for research less,coupled with the current domestic lack of bridge load limit management standard therefore,it is necessary to study the reasonable limit of city bridge vehicle load.In this paper,the data of two typical freight traffic channels are selected and analyzed by data comparison.Based on the parameters of the actual traffic flow analysis,the random traffic flow is generated by the Monte Carlo method,and then the load effect is carried out with the fitted flow data.Finally,the bridge is divided according to the bridge.The results of class statistics are based on the selection of 5 typical bridges based on the parameters,such as the number and the span,and then according to the existing bridge detection report and the finite element modeling analysis,the structural resistance is established and the load limit analysis is carried out.The specific research results include the following points:(1)traffic information investigation and statistical analysisSelect the Xin'An River Road and Langxi Road West,South Second Ring Road and south of the jade of the two point data as the analysis object,according to the distribution of several common types,the K-S inspection method to carry on the statistical analysis of vehicle weight,vehicle spacing,and other data.The probability and statistical parameters of the distribution parameters are obtained,which lays the foundation for the establishment of random traffic model in the later period.(2)the establishment of random traffic flow model and the development of calculation softwareBased on the MATLAB platform,a random traffic load effect analysis software is developed,which has two functions of generating random traffic flow and load effect.At the same time,it provides a computing platform for later processing a lot of traffic data.(3)analysis of vehicle load effect and calculation of typical bridge load limitSelection of bearing shear and bending moment as the research object,using influence line loading principle,the effect and the city traffic data randomly generated in standard span T beam bridge on a standard load were analyzed,the results indicated that the differences between the actual traffic load and standard load in the specification.In the area of Hefei bridge type of statistical results,select the bridge 5 typical city,based on Monte Carlo method,according to the target reliability,using weight function can be selected in the software,the inverse reasonable load limit value,also verified according to the reasonable limit of old bridges standard design of old standard load.(4)exploring and putting forward a new model of bridge load managementThe purpose of this paper is to get the reasonable vehicle load limits of typical urban bridges in Hefei area,and explore a new bridge load management mode based on the research.At present,the pilot work has been gradually started.In the design stage,two bridges in Hefei area have been reserved for the installation of dynamic weighing system,and the research and development of related systems are also gradually following up.