Bridge Design
Bridge Design
(OP)
I am new to bridge design and am designing a cantilevered retaining wall abutment (with a single row of piles under toe directly below bearing centreline)and have two queries:
1) I am used to working stress design for footings and foundations and am confused with the limit state check for sliding overturning and bearing. The relevant codes AS5100, AS4678 and AS1170.1 all seem to contradict each other. Is the criteria simply Ult. Overturning Moment < Ult. Restoring Moment and when are the uncertainty factors applied?
2) In relation to designing reinforcement for the RC abutment wall, is it a correct assumption to treat the wall as a two way slab for bending and as a column for axial loading?
Any help would be greatly appriciated.
1) I am used to working stress design for footings and foundations and am confused with the limit state check for sliding overturning and bearing. The relevant codes AS5100, AS4678 and AS1170.1 all seem to contradict each other. Is the criteria simply Ult. Overturning Moment < Ult. Restoring Moment and when are the uncertainty factors applied?
2) In relation to designing reinforcement for the RC abutment wall, is it a correct assumption to treat the wall as a two way slab for bending and as a column for axial loading?
Any help would be greatly appriciated.





RE: Bridge Design
That said,
1. You must be into LRFD for the foundation checks and so generally speaking you're going to find the equations of the factored load being less than or equal to the factored resistance. The uncertainty is implicit within the load factors and resistance factors that you need to use.
2. In most cases I've seen and done the wall is not treated as a twoway slab but a beam. Yes, the wall can be treated as a beam column, i.e., with bending and axial loads.
Regards,
![[pipe] pipe](https://www.tipmaster.com/images/pipe.gif)
Qshake
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
RE: Bridge Design
RE: Bridge Design
From what I can gather, the bridge system you are faced with here is an integral type.
Overturning does not apply, and a different analysis is required replicating the entire system.
I second dinosaur's suggestion to have someone experienced with this type of bridge design first. Specifics can be answered after you become a little more familiar with the type of analysis.
HTH
VOD
RE: Bridge Design
Regards,
![[pipe] pipe](https://www.tipmaster.com/images/pipe.gif)
Qshake
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
RE: Bridge Design
VOD
RE: Bridge Design
RE: Bridge Design