Vehicles Of Transverse Position Random Response Analysis Of The Bridge Space Effect

Vehicle load transverse distribution is one of the random traffic flow characteristic parameters and is an important factor of impacting vehicle load effect. Under normal traffic flow situations, the transverse position of vehicle running is random, but in the former design and calculation it usually supposes that the vehicle runs in the center of driveway, which surely will have deviation with horizontal position of the vehicle actually driving and then in some extent influence the computational results. Therefore, researched on the corresponding impact which is produced by vehicle load transverse distribution and beam bodies has important significance for confirming new bridges'design load, bridge time-varying reliability analysis, ultimately bearing capacity calculation and random traffic flows'analogue simulation etc. This paper examines the 24 hours'traffic load condition of highway, selectively analyzes the vehicle transverse position when steering, BDANS is used to calculate the response produced by bridge structure under an actual traffic load condition.Meanwhile, response value is counted and researched detailedly, the impact on bridge structure caused by Transverse position of vehicles with random or no random is compared when the vehicle bridge. Specific research content as follows:First, through analyzed statistically practical survey acquisition of traffic load sample data, we research random traffic stream's space-time distribution rule, analyze emphatically the vehicle transverse position, and then summarize the rules and characteristics of vehicle load transverse distribution.Second, pointed at the actual situation of traffic survey, BDANS is used to calculate dynamic response produced by each piece of beam body when every vehicle actual bridge; the response extreme value was chosen for analysis object, each piece of beam body's dynamic response characteristics under the vehicle transverse positions random is researched, and then each piece of beam body's dynamic response characteristics for different types of vehicles under the vehicle transverse positions is discussed.Third, though assuming that the vehicle by traffic surveyed travels on the partitioning driveway, the dynamic response produced by each piece of beam body under the vehicle transverse positions no random is calculated. Though compared the characteristics of traffic stream under transverse positions is random or no random, dynamic deflection time-history curves of beam body, the beam body's dynamic deflection and bending moment response extreme value under different circumstances, we can get the influence of bridge structure caused by the vehicle transverse positions' random or no random, and the response value of each piece of beam position on the vehicle lateral sensitivity of random and not random.