@BridgeSmith
You are right that there shouldn't be any significant reduction in capacity.
The owner is just trying to keep homeless people away. Since this is not a bridge structural retrofit work, they prefer that girders are not affected.
If we can clip and secure the grillage on the cross...
Thank you for your replies.
@BridgeSmith: Near the abutment, the web is subjected to the highest shear, so we thought drilling holes into webs wouldn't be a good idea. We wanted to do something less intrusive.
@jhnblgr: Well, the bridge is already there, and it's girder-on-bearing type bridge...
Good day all.
Looking for something similar as shown in the photo below for concrete girders, except that ours is for a steel girder bridge.
We don't want to drill holes to the steel girder webs.
Does anyone have drawings / photos / ideas about how to install such a cage for steel bridges...
Dear Admin,
Bridge Engineering is a multi-disciplinary subject involving Structural, Geotechnical, Water Resources, and Transportation Engineering.
Unfortunately, the new layout of the forum has made this subject obscure. It is now hidden inside other subforums.
Please make Bridge Engineering a...
Good day all.
We are designing semi-circular cantilever tabs to support light poles on the exterior of a bridge. Due to wind action, the light poles – and therefore these tabs – are subjected to significant moments / torsion.
Some DOTs have standard drawings for these tabs. An example from...
Good day all.
Owner is afraid that flood will wash away the embankment, and the stub (perched) abutment will collapse. Abutment is on spread footing with no piles underneath. This has happened to some other bridges (a random example shown below).
So, we are doing a preliminary conceptual...
Sorry BridgeSmith, I don't understand! If the bases of the posts are considered fixed, there will be torsion at the base. This torsion will transfer to the cylindrical foundation. Right?
Let's look at a practical example. We have this large 55.5 m overhead sign. Post height is 9.5 m (average)...
@BridgeSmith
Thank you for taking time in replying in detail. It's CIP. The Code is Canadian. We will not do P-y analysis. We will use Modulus of Subgrade reactions recommended by Geotech to determine soil spring stiffnesses and do the analysis.
You mentioned Torsion is usually not an issue...
Good day all.
We are going to design a cylindrical concrete foundation for a large overhead highway sign structure.
The manufacturer of the sign structure will provide us with the forces and the moments at the top of the foundation. A sample is shown below. Notice the high torsion.
We also...
@ lexpatrie, @ fel3, @ Tomfh
Thank you for your comments. We will see if we can sell the idea of a steel bracket to the owner.
@ TLHS
Very good points about moments and torsion. The load path gets complicated, and developing resisting couples using the dowels may be tricky.
You are right about...
@ CDLD
Thank you. Yes, the dowels will be attached by Hilti adhesive anchor or similar. But I am having difficulties in figuring out the load path, and reinforcement arrangement. If this had been a monolithic construction, I would have used a strut-and-tie model. The light pole (due to wind...
Good day.
We know how to design a corbel in a monolithic construction.
However, my problem is different. We need to design a new corbel that attaches to an existing structure.
As shown below, the new corbel is a light pole base which gets attached to the existing bridge deck. So the...
