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HL-93 vs HS20 - University of Nebraska–Lincoln

4/22/15 2015 Nebraska Bridge Conference 1 HS20-44 vs HL-93 (Standard Specifications vs LRFD Code) Fouad Jaber, Assistant State Bridge Engineer NDOR BRIDGE CONFERECE KEARNEY,NEBRASKA April 14th, 2015 Topics to cover: Topic 1: Comparison of ASD, LFD and LRFD Topic 2: LRFD Objective and calibration Topic 3: Comparison of HS20-44 VS HL-93 Topic 4: FHWA SHV s new memo Topic 5: Husbandry Vehicles and NE Legal Loads Conclusion and things to consider Topic 1 Comparison of ASD, LFD and LRFD Golden Rule of Engineering A. load > Resistance B. load = Resistance C. load < Resistance Designs must be safe, therefore? 4/22/15 2015 Nebraska Bridge Conference 2 Uncertainty Material dimensions and location Material strength Failure mode and prediction method Long term material performance Material weights Prediction of potential Live loads load analysis and distribution methods General uncertainty associated with structural function Allowable Stress Design (aka Working Stress Design) FS: Factor of Safety.

level of reliability in an LRFD-format specification. AASHTO chose this reliability to be 3.5 @ inventory level And 2.5 @ operating level Calibration continued Only the strength limit states of the LRFD Specifications are calibrated based upon the theory of structural reliability, wherein statistical load and resistance data are required.

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