Study On Pedestrian-Induced Vibration Of Steel Box-Girder Footbridge With Corrugated Webs

The current pedestrian bridge is headed in big stride, tender, and the light of direction development. But for the large span gently pedestrian bridge and the structure vibration frequency tend to be low, if the people under the excitation of the vibration, it can lead to more substantial structure vibration, so the pedestrian bridge is designed to reduce the performance. More serious will be lead to the pedestrian bridge in people under the incentive resonate, even cause a major accident to the pedestrian life. Therefore, this paper will proposes a pedestrian bridge steel structure of the new structure form--use the corrugated steel webs ordinary straight steel box girder webs alternative pedestrian bridge, and gives its structure form and detail structure design too. The bridge structure software of finite element analysis MIDAS/Civil respectively on ordinary steel webs footbridge and ripple webs do bridge did incentive load and structure dynamic response analysis, and the paper puts forward to verify the pedestrian bridge structure performance.First of all, pedestrian bridge crowd load dynamic model were summarized, in the literature review is presented on the basis of the crowd of3kinds of power load model, including single load, load and low density group the crowd poured load., and using the method of the camera playback to survey pedestrian through a pedestrian bridge for the time and the quantity, and the calculation bridge step and step frequency, of the survey data are analyzed.With the common straight webs pedestrian bridge to design prototype for steel box girder, and the ripple of the steel box girder of web pedestrian bridge for try design, and gives the main structure and the size of section.The software of bridge structure finite element analysis MIDAS/Civil are built up for the ordinary straight webs pedestrian bridge and the corrugated steel box girder redesign of the finite element model of the steel box girder of footbridge. For convenience of contrast, the two pedestrian bridge using the steel quantity is the same. Considering the three types of pedestrian incentive load, namely single load,, load and low density group the crowd poured load, the load on the finite element method and draw the conclusion is that in these three kinds of a pedestrian bridge load of displacement upper the structure, velocity and acceleration power time history analysis of the results, and the comparison of the two kinds of steel box girder in a pedestrian bridge structure of the performance inspired is by quality. The results of the calculation show that the proposed corrugated steel box girder webs pedestrian bridge are more lateral stiffness, in pedestrian load, cross the most unfavorable position in the process parameters (displacement, velocity and acceleration) than that of ordinary straight webs pedestrian bridge to small steel box girder, ang the pedestrian bridge comfort can be improve.Finally, the study of the ripple webs steel box girder footbridge typical design parameters, and the comparison of the corrugated webs wavelength, the wave Angle changes to pedestrian bridge structure dynamic performance, the influence of the right wavelength, its concluded that the parameters of the wave angle ang the wavelength is designed for the reference.