Bridge Abutment
Material Properties and Cover
Superstructure Data
Note: It is assumed that there are 2 facia girders and the rest are interior girders
Abutment geometry
Abutment
Wing Wall
Loads/Forces
Dead Loads
DC dead load per foot:
DW dead load per foot:
Weight of backwall
Weight of stem
Weight of footing
Weight of soil
Live Loads - Traffic (Vehicle)
Live Loads used for Backwall Design
Backwall - For design of the backwall will use the dynamic load allowance and the multiple presence. - Assume that each lane has the design truck axles along the abutment. Convert this to a load per foot.
Live Loads overriden to match loads provided by temporary bridge manufacture
Girder reactions - Enter as Unfactored w/out any lane factors
Live Loads Used for Stem Design
- Use dynamic load allowance and multiple precence factor
Max downward loading
Live Loads overriden to match loads provided by temporary bridge manufacture
Max uplift loading
Live Loads Used for Footing Design
- Do NOT include dynamic load allowance - but do include multiple presence factor
Max downward loading
Live Loads overriden to match loads provided by temporary bridge manufacture
Max uplift loading
Live Loads overriden to match loads provided by temporary bridge manufacture
Braking Force
Number of lanes in same direction
Total Braking force
Braking force on abutment
Wind Load
Wind Load from Superstructure
Longitudinal Wind
10% of transverse wind load provided by temporary bridge manufactuer
Transverse
Overiden to match temporary bridge manufacturer loads
Wind Load on Substructure
Trib area of abutment
Transverse
Longitudinal
Total Horizontal Wind Load
Transverse
Longitudinal
Wind load on Vehicles
Transverse
Longitudinal
Wind - Vertical
Vertical wind pressure
Uniform load along centerline of bridge
Vertical load at abutment
Earthquake Loads
Minimum Support Length
Earth Loads
Horizontal Force on Backwall
Horizontal Force on Stem
Horizontal Force From Bottom of Footing
Vertical Soil Weight
The passive soil above the toe will be ignored
Soil weight over heal
Loads due to live load Surcharge
Note: Because a lab and roadway cover te abutment backfill material, no uniform surcharge will be applied. However, AASHTO requires that a live load surcharge be applied. Per tables 3.11.6.4.1. A reduction may be applied when an approach slab is used, which bears on the back wall. AASHTO does not give direction on what this reduction may be. PER FWHA this surcharge is applied uniformaly against the back of the wall (like a normal surcharge, not a soil load).
Horizontal Force on Backwall
Horizontal Force on Stem
Horizontal Force From Bottom of Footing
Thermal Forces
Expansion / Contraction:
UPDATE THERMAL FORCES FOR INTEGRAL ABUTMENT My neglect if bridge meets DOT prescriptive requirements for integral or semi-integral
Factored Foreces for Design - Backwall
The load combiniations that will be considered are Strength I, III and V and Service I The maximum loads will be used as minimum loads will not control in this case Wearing surface load is small and will be neglected.
Programer Note: At some point add a space to "Recall Loads from above" that way it is easy to see what loads are being used in the LC's.
Factored Loads for Stength Combo's - Backwall
Factored Loads
Axial, Shear and Bending Forces
Axial Force
Shear Force
Moment Force
Service Loads for Service Combo's - Backwall
Service Loads
Axial, Shear and Bending Forces
Axial Force
Shear Force
Moment Force
Factored Foreces for Design - Stem
The load combiniations that will be considered are Strength I, III and V and Service I The maximum loads will be used as minimum loads will not control in this case Wearing surface load is small and will be neglected.
Use same load combinations as Backwall
Factored Loads for Stength Combo's - Stem
DC Load
Programer Note: At some point add a space to "Recall Loads from above" that way it is easy to see what loads are being used in the LC's. Then update the function inputs with these variables. i.e.: w.DCuf = w.DLabut2 = show value then use w.DCuf in the function. that way w.DCuf can be updated for bw, stem and footing.
Eccentricty of the girder reaction
Factored Loads
Axial, Shear and Bending Forces
Axial Force
Shear Force
Moment Force
Service Loads
Axial, Shear and Bending Forces
Axial Force
Shear Force
Moment Force
Factored Foreces for Design - Footing
The load combiniations that will be considered are Strength I, III and V and Service I The maximum loads will be used as minimum loads will not control in this case Wearing surface load is small and will be neglected.
Use the same load factors plus additional listed below
Prevoius
Added cases for footing:
Use minimum Vertical Earth and Maximum Horiz earth to maximize OT effects
Use minimum Vertical Earth and Maximum Horiz earth to maximize OT effects, additionally use min dead load
Modify Group V - use min value for EV to maximize OT effects.
Factored Loads for Stength Combo's
DC Load
Programer Note: At some point add a space to "Recall Loads from above" that way it is easy to see what loads are being used in the LC's. Then update the function inputs with these variables. i.e.: w.DCuf = w.DLabut2 = show value then use w.DCuf in the function. that way w.DCuf can be updated for bw, stem and footing.
Eccentricty of the girder reaction
Eccentricty from CL of ftg to soil over heel
Factored Loads
Axial, Shear and Bending Forces - Maximum / Min
Axial Force
Shear
Shear Force - Along the longitudinal axis
Shear Force - Along the transverse axis
Moment
Moment Force - About the transverse axis Due to the longitudinal loads
Note: The FWHA calls the M.long b/c the moment is due to Longitudinal loads. We call it M.trans b/c the moment is about the transverse axis.
Note e.soilhl is negative
Moment Force - About the longitudinal axis Due to the transverse loads
Axial, Shear and Bending Forces - By Load Combo
Enter any Load combo to see individual results
Service Loads
Factored Loads for Service Load Combo's
Programer Note: At some point add a space to "Recall Loads from above" that way it is easy to see what loads are being used in the LC's. Then update the function inputs with these variables. i.e.: w.DCuf = w.DLabut2 = show value then use w.DCuf in the function. that way w.DCuf can be updated for bw, stem and footing.
Service Loads
Forces To Export