Statistical Analysis Of Vehicle Loads And Effects For Midspan Bending Moment And Abutment Shear Force Of Two-span Continuous Beams On Highway Bridges

Since the 21 st century,the transportation industry and the automobile industry have developed rapidly,and the number of cars and heavy-duty vehicles has increased compared with the past.Highway bridge engineering is not only part of the engineering structure design,but also an important part of highway engineering.Its safety,reliability and rationality of economic benefits are all related to the allocation of social resources.If the road bridge design is unreasonable,it will lead to huge loss of social wealth and state-owned assets.It may even happen that the collapse of the bridge will endanger the safety of the national life.As one of the important influencing factors,vehicle load research on highway bridges has received the attention of the state and people from all walks of life,and has developed a series of relevant standards and norms for the design of highway bridge structures in China.The content of this paper is a sub-project extended by the research project “Research and Analysis of Highway Bridge Vehicle Load Reliability” provided by China Communications Road and Bridge Technology Co.,Ltd.With the help of the automatic vehicle heavy observation instrument(VIM),the data related to the measured vehicle load of the 107 national highway bridge is collected,and the amount of data is large and abundant.After repeated random sampling,parameter estimation and distribution fitting test,the distribution of the traverse of the bridge vehicle load is log-normal distribution.The maximum distribution of vehicle load during the design service life is the extreme value I distribution.On this basis,it is used to investigate the statistical analysis method of the mid-spin bending moment and the bearing shearing effect of the static-stable single-span simply supported beam and the statically indeterminate continuous beam.Because the structural span,span and bridge materials of the bridge are various;the focus of this research is to explore the statistical analysis method of the load effect of the statically indeterminate structure,so choose the simplest two-span continuous beam bridge(including etc.Two kinds of effects of cross-center bending moment and bearing shearing force of span and unequal span are discussed.The statistical analysis method of load transformation into effect of statically indeterminate structure is discussed,and the heavy load of continuous beam and unequal two-span continuous beam is analyzed.The load distribution maximum value distribution model and the effect standard value during the service life period,the vehicle heavy load has different effects on different bridge structures to facilitate the corresponding parameter adjustment of the bridge structure reliability and safety.In the search for vehicle load and load effects,a "big data technology" was used for statistical analysis.