WIN-DASH/PDesign and Analysis of Straight Highway Bridges

Tutorial (for a 3-Span Prestressed Beam Bridge)

Providedby

The BEST CenterUniversity of Maryland

Case Study: Bulb-Tee (BT-72), Single Span, Composite Deck, based on Standard Specifications

Bridge Cross Section (Ref. PCI Bridge Design Manual)

Project Data (01012, 01022)

General Program Option (01032)

To switch to Prestressed Concrete mode, input Type 4

Span interval can be any numbers from 4-20

Only two modes in PC: Analysis and Design

Structural Details (03012)

Position will affect the Effective Width and Distribution Factor

Haunch will affect the section properties and weight

These two entries are used for steel girder only

Longitudinal Section(Ref. PCI Bridge Design Manual)

Span Lengths (03062)Refer to the previous sketch for Span Length (2), Overhangs (1&3) and Gap Distance (4)

Hinge Locations (03032)

Refer to the previous sketch for Hinge Locations, which coincide with the end of span, the accumulation of the span lengths

Assume simply supported case for DL and continuous case for SDL and LL

Beam Spacing (03042)

Spacing is required for Distribution Factor and DL calculation

AASHTO-PCI-BT-72 Bulb-Tee

Internally Stored Girder Sections in Win-DASH/P:

AASHTO I – VI

Bulb Tee BT-54, 63, & 72

PC Section (04012)ID 0 is for internally stored AASHTO Girder. 72 is for BT-72

Composite Section (calculated by Win-DASH/P)

Strand Pattern (Ref. PCI Bridge Design Manual)

Longitudinal Strand Profile(Ref. PCI Bridge Design Manual)

Slab and Tendon Geometry (05032)

Lines 1-4 are for straight tendons input by rows.

Line 5 is for draped tendons input by groups where distance refers to the C.G. of the group

Repeat the same process for all the spans

AASHTO Live Loading (06012)

Arbitrary Uniform and Concentrated Loads (11012)

SDL for wearing surface

Auto Generation of Dead and Superimposed Dead Loads (02012)

Slab thickness for section property calculation and slab + integral wearing surface for DL calculation

Slab Information (12034)

Rebar input is used for the calculation of negative moment capacity at the pier

Precast Beam Information (12036)fc’ at 28 days is for service condition.fc’ at release is for initial condition

Prestressing Steel Properties (04032)

fsi=0.75fs’ is used in this example

If leaving blanks, losses will be calculated by the program based on the AASHTO