2588-03Reliability-Based Design of Horizontal Curves on Two-Lane Rural Highways

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1、Reliability-BasedDesignofHorizontalCurvesonTwo-LaneRuralHighwaysBasharDhahirandYasserHassanCurrentdesignguidesadoptadeterministicapproachtothedesignofhorizontalcurvesaccordingtotheirownperceptionratherthanthehorizontalcurves;eachfactorincludedinthedesignisrepresentedbydesigner’sperception(4).the

2、near-worst-casevalue.Inthecontextofhorizontalcurvedesign,theAlso,theabilitytoevaluatethetrade-offsbetweencostandleveldesignprocedureisbasedonlyonthedrivercomfortcriterion,anddataofsafetyestablishestheneedforaquantitativemethodtoevaluatecorrespondtoexperimentsconductedinthe1930s.Furthermore,curre

3、ntthesafetyofthedesign.Unfortunately,thecurrentdesignguideshorizontalcurvedesignprocedureslackaquantitativeevaluationforcannotaddressthisneedbecausehorizontalcurvesafetyisincludedsafety.Toovercomethoseshortcomings,anewdesignframeworkispro-onlyimplicitlyinthedesign.Furthermore,thedesignguidesadop

4、tposedtodesignhorizontalcurves;aprobabilisticapproachisadoptedadeterministicdesignapproachthatdoesnotconsiderthedistribu-andtwocriteriaareconsidered:vehicledynamicstabilityanddrivertionofdesignparametersandinsteadisbasedonanear-worst-casecomfort.Reliabilityanalysiswasusedtoprovideaquantitativeev

5、alua-scenarioforeachdesignparameter.Inthatrespect,reliabilityanaly-tionforthedesigninregardtotheprobabilityoffailure,probabilityofsisshouldbeusedbecauseitaccountsforthevariabilityofdesignnoncompliance,andreliabilityindex.Outputsofsimulationrunsinaparametersandprovidesreliabilitymeasuresthatcanbe

6、quantitativelyvehicledynamicsmodelwereusedtoestimatedemandlateralfrictionrelatedtosafety.andlateralaccelerationdependingonthegeometriccharacteristicsofhorizontalcurves.Inaddition,dataofaninstrumentedvehicleexperi-HorizontalCurveDesignmentwereusedtodevelopdriver-levelmodelsforthedistributionofthe

7、curvespeedanddrivercomfortthreshold.Thefirst-orderreliabilityThehorizontalalignmentofaroadwaygenerallyconsistsofthreemethodwasusedtoestimatetheprobabilityoffailure,probabilityofcomponents:tangentsections,horizontalcurves,and