Steel and Reinforced Concrete

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Presentation transcript:

Steel and Reinforced Concrete MERLIN-DASH Design and Analysis of Steel and Reinforced Concrete Straight Highway Bridge Systems

MERLIN-DASH Development Began in 1975 Cooperative effort between Maryland State Highway & University of Maryland Basic program completed in 1978 Microcomputer version in 1985 FHWA DP-81 began in 1988 SI version in 1994 WINDOWS version in 1995 LRFD version in 1996 WINDOWS/NT & Network version in 1997

FHWA DP-81 SHORT COURSE HOST STATES

MERLIN-DASH Program Functions Steel & Reinforced Concrete English & SI Units DL, SDL & LL + I WSD, LFD & LRFD Analysis, Design, Code Checking, Rating & Staging

MERLIN-DASH Banner Page

MERLIN-DASH Input Utility

MERLIN-DASH Input Verification

MERLIN-DASH Execution Utility

MERLIN-DASH Graphic Utility

MERLIN-DASH Print Utility

New Alternations in LRFD New Dynamic Load Allowance New Distribution Factors New HL-93 Truck New Limit States New Load Combinations New Fatigue Consideration New LRFD Specifications New Design Considerations New Rating

Auto Generation of LRFD New Distribution Factors By Force: Moment & Shear By Geometry: Skewed & Non-skewed By Zoning: Positive & Negative Moment Areas By Limit State: Strength & Fatigue Limit States

LRFD Limit States Strength I rp1DC + rp2DW + 1.75(LL + I) Strength II rp1DC + rp2DW + 1.35(LL + I) Strength IV rp3(DC + DW) rp1 = 1.25 - 0.9, rp2 = 1.50 - 0.65, rp3= 1.5

LRFD Limit States (cont.) Service I (DC + DW) + (LL + I) Service II (DC + DW) + 1.3(LL + I) Fatigue 0.75(LL + I)

DASH Code Check Output Web Depth and Thickness Ratio Strength Category Strength Bending Capacity Strength Shear Capacity Serviceability Fatigue Shear Connector (Fatigue) Shear Connector (Strength) Splice Design