| Now modern footbridge across toward the big, gentle direction, footbridge comfortproblems caused by more and more people are concerned. In this paper, the finite elementsoftware SAP2000, combined Bayuquan cross passers footbridge instance Jingang of theCFST footbridge were static analysis, modal analysis, dynamic response analysis, comfortevaluation, and factors affecting the CFST comfort Arch Research.Concrete Filled Steel Tube skywalk static analysis and modal analysis showed that thebridge force, deflection, stress ratio, natural frequency and other parameters to meetregulatory requirements. In the footsteps of the flyover dynamic load response analysis,seeking to acceleration, velocity and displacement response of the power of the flyover timecurve values, indicating that the flyover comfort to meet the relevant regulatory requirements.Research on human comfort troubles skywalk reference rate analysis showed that lowerfrequency vibration bridges with people’s footsteps load2.0Hz frequency difference betweenthe larger, vertical trouble flyover was0.1253, that is12.53%of the people on the pedestrianoverpass discomfort, less than20%assuming a standard, comprehensive judgment satisfiesthe pedestrian loads of comfort.In conformity with the structural safety, the number and arrangement of the changesaffect the flyover construction boom comfort small; crossbars form a bridge for comfortposition has a certain influence, when crossbars in Rib with bridge panel joints of thestructure is more favorable, the use of X-shaped cross-brace more favorable than the parallelcrossbars flyover comfort; flyover of annoyance rate increases with decreasing Rib, Ribsmaller diameter on the degree of annoyance more large. Rib Rib steel ratio and diameter ofthe main factors flyover comfort, smaller boom and layout affect stretchers.This paper bridges boom conservative design, the proposed halving the number of boom,take Rib diameter650mm, to optimize the design. |
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