C1.1 This edition of the Guide Specifications was developed from the previous Allowable Stress Design (ASD)- and Load Factor Design (LFD)-based first edition (AASHTO 1997). An evaluation of available foreign specifications covering pedestrian bridges, and failure investigation reports, as well as ...
ImplementationReview LRFDtransitionishistoric –LRFD1 st mandatorychangeindesign philosophyinbridgedesigninUSA –ASDhasbeenaroundsince1 st AASHO Specification(1931) –LFDintroducedin1970’sbutnever mandatoryfordesignacrossnation –LRFDmandatedbyFHWAfornewbridge designbeginningOctober1,2007 LRFD– Implementation...