大跨人行悬索桥主梁涡振振幅限值研究

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中图分类号：U448.11；U448.25 文献标志码：A 文章编号：1005-8249（2025）06-0076-06

DOI：10.19860/j.cnki.issn1005-8249.2025.06.014

Abstract： To ensure that the long-span pedestrian suspension bridge can simultaneouslytake into account pedestrian comfort and structural safety，relying onthe scenic area pedestriansuspensionbridge with amain spanof152 metersas theengineering background，thelimitvaluesoftheverticalbendingamplitudeandtorsionalamplitudeofthevortexvibratioofthemainbeamof thebridgewereobtainedbyusing themethodsofcalculationandCFDnumerical simulation．Comfortanalysiswasconducted by designingthe maximumverticalbendingandtorsional vortexamplitude valuesoftheactualvortexvibration vibrationofthebridge withintherangeof hemaximum windspeedand windatackAngle.Theresultsshowthatas thewindatackAnglechangesfrom positiveto negative，thevertical bending vortexvibrationperformanceof themain beamofthelong-span pedestrianbridge deteriorates. The most unfavorable vertical bending vortex vibration occurs at a wind attack Angle of 0∘ ，which can meet the safeverticalbendingvortexvibrationamplitudebutexceedsthevortexvibrationamplitudelimit thatmeetsthecomfortlevel；As thewindattackAnglechangesfromnegativetopositive，thetorsionalvortexvibrationperformanceof themainbeamofthelong -span pedestrianbridge deteriorates.The wind sped lockingrange shifts towards the high wind speed zone.The most unfavorable torsional vortex vibration occurs at a 3∘ wind attack Angle，which not only exceeds the vertical bending vortex vibrationamplitude thatmeetssafetyrequirementsbutalsoexceedsthevortexvibrationamplitudelimitthatmeetscomfort requirements.Theresearchconcludes that th limit standards for vortex vibration amplitudeof long-span pedestrian suspesion Bridges considering pedestriancomfortare stricter.Theresearchresultscanprovideabasisforthecalculationofamplitude limit values of long - span pedestrian suspension Bridges.

Key words：long span pedestriansuspensionbridge；pedestriancomfort；eddy vibration limit；vortex amplitude；acceleration amplitude

0 引言

近年来，越来越多景区建造景观人行悬索桥，此类桥多建于悬崖和峡谷，风荷载作用明显。（剩余6294字）