@LittleInch , Yes we will measure thickness with ultrasonic thickness gauges.
@BridgeSmith , Yes, in this simply supported girders, plates were added to the flanges to resist higher moments at mid-span.
@bridgebuster , That's what we expect.
@Lomarandil , I appreciate your sharing the...
@Lomarandil Thank you for your prompt reply. We thought it would be a double (back-to-back) web because of those rivets on the web. We don't know what else are those rivets for.
If you have pre-1960 drawings of riveted through plate bridges, it would be great if you could share sheets that have...
Good day all.
This old railway bridge will be converted to a pedestrian bridge. There is no drawings available.
It's a built up riveted through plate girder bridge consisting of angles and plates. To do a load rating, we need no know cross sections of the girders. We will take as much field...
@BridgeSmith We will look in plate girder versus rolled shape options. At this time, we are not considering fully or semi integral options. For leaky joint concerns, we might opt to paint a meter or so of girder end. But preferred superstructure is a truss to make the structure stiff against...
@AS_PEng Thank you for taking time to write in detail.
The bridge is on a trail near mountains, so access of equipment is an issue. We have retained an experienced construction engineer to advise us on that. We may have to use micropiles for the abutment instead of HP piles to allow smaller...
@Lomarandil, agreed. Contractor will likely end up asking a prefabricator. However, we need to come up with a conceptual design that meets various criteria mentioned.
@LittleInch, well 3.0 m is required for two pedestrians passing with some personal space around. Although COVID-19 is not...
@BridgeSmith: Vertical grade is theoretically flat. But probably a small camber at mid-span will be provided even though the bridge is only 16.0 m. Yes, a truss would serve as a pedestrian barrier. But truss members (typically hollow sections) require lots of welding.
Good day all.
We are going to design a small pedestrian bridge over a creek. It's 16.0 m long and about 4.0 m wide.
We are at the conceptual design stage now. The governing criteria is functionality and cost effectiveness - rather than aesthetics.
We could do a Pratt Truss or Warren Truss, or...
@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...
