pile cap
pile cap
(OP)
hi i am new to bridge design and i am having trouble transferring live load on the pile cap can some one help i have a 70 ft simply supported span and my loading is hs20-44
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: pile cap
Take a look through it and it may resolve some questions about the process. However, determining which lane combinations/placements to determine the greatest effect takes lots of exercise doing so and experience.
The manuals on the FHWA site are LRFD which means the loading is HL-93. The difference is that HL-93 is an HS20 truck AND a lane load with the truck. You can always refer to AASHTO for further clarification about the loading and about the "lever rule". Off the top of my head I can't remember which sections they are in.
RE: pile cap
RE: pile cap
Regards,
![[pipe] pipe](https://www.tipmaster.com/images/pipe.gif)
Qshake
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
RE: pile cap
__________________ <--Cap Beam
1 1 1
1 1 1
1 1 1 <--- columns
---------------------------------- Ground Surface
1 1 1
1 1 1 <-- continuation of columns
If you're trying to figure out the load on a "cap beam" in a pile bent pier, follow the link that BridgeEI posted, download the steel bridge example, go to Chapter 8. It shows how to distribute the loads into the beam. It's the same procedure for Standard Specs or LRFD.
RE: pile cap
RE: pile cap
Regards,
![[pipe] pipe](https://www.tipmaster.com/images/pipe.gif)
Qshake
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
RE: pile cap
Look at the attached sketch. I added some notes. Once you calculate the stringer reactions on the pier cap, then you can determine your pile/column loads.
RE: pile cap
RE: pile cap
RE: pile cap
Regards,
![[pipe] pipe](https://www.tipmaster.com/images/pipe.gif)
Qshake
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
RE: pile cap
I would like to learn more.
RE: pile cap
Shorter said, is the live load reaction you have obtained from hand calculations or from a software program?
RE: pile cap
RE: pile cap
RE: pile cap
If you use point (wheel loads) loads - each wheel is one-half the axle.
If you use a lane load you still need to include the 26k concentrated load for shear.
RE: pile cap
RE: pile cap
This is a very common approach. Only three-dimensional grillage (or FE) analysis will give more precise results.