| The box girder bridge with trapezoidal corrugated steel webs is composed ofconcrete roof, floor and corrugated steel web, using8~20mm trapezoidal corrugatedsteel webs instead of concrete webs, which can lighten superstructure self-weight toachieve the lightweight and then enlarge spanning ability. With the widely generalizedand used of the box girder bridge with trapezoidal corrugated steel webs at home,studies are more concentrated on basic mechanical property and design theory insteadof its seismic performance. So it is necessary to study the seismic performance of thebox girder bridge with trapezoidal corrugated steel webs in details, so as to ensure thebridge with the new structure could withstand the test of earthquake. The maincontent of this paper includes:(1)Firstly, this essay mainly discussed the characteristics of earthquake disastersand the seismic characteristics. With a large number of quotation of essays bothdomestic and foreign, the common manifestations of bridge seismic damage issummarized. At the same time, this essay also reviewed the development of the boxgirder bridge with trapezoidal corrugated steel webs, and summarized the currentresearch status of its seismic performance. Finally, the theory of bridge seismicfragility analysis is introduced based on structural performance-based seismic designhotspot.(2)A typical multi-span bridge in the mountains is taken as an example in thisessay, and its superstructure was designed separately in both composite box-girderwith trapezoidal corrugated steel webs and conventional concrete box girder. Thedynamic characteristic of two structures is compared based on the dynamic finiteelement models in MIDAS CIVIL.(3)According to the latest bridge seismic design specifications, the responsespectrum was analyzed for both box girder bridge with trapezoidal corrugated steelwebs and the traditional concrete box girder bridge based on the overall analysismodel of the previous section (multi-joint structural system). Both earthquakes alongthe longitudinal and transverse direction was considered in the analysis above.Comparatively analyzed seismic performance difference between the box girderbridge with corrugated steel webs and traditional concrete box girder bridge.(4)Taking intermediate union of the overall bridge for example, theelastic-plastic finite element dynamic analysis model was build based on the OpenSees source code analysis platform. And the time history analysis was done withthe100seismic waves as input signals. This essay also analyzed the seismic fragilityfor both box girder bridge with trapezoidal corrugated steel webs and traditionalconcrete box girder bridge according to the calculation result and the principles ofbridge seismic fragility analysis. Comparatively analyzed the seismic fragilitydifference between the box girder bridge with corrugated steel webs and traditionalconcrete box girder bridge.(5)The analysis and comparison work was done between the associated contentof earthquake resistance system of bridge structure codes in USA and China, thecharacteristics and components of reasonable bridge earthquake resistance system issummarized in detail. Besides, the perspective of the earthquake resistance system ofthe box girder bridge with trapezoidal corrugated steel webs is elaborated combinedwith the aim of the essay.(6)At last summarizing the research work of this paper and indicating theinadequacies of this essay study, then the worthy study subsequently is prospected. |
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