Truss Bridge - HLMR retrofit Truss Bridge - HLMR retrofit justhumm (Structural) (OP) 1 Sep 16 22:01 Does anyone have any knowledge of a truss rehabilitation project (anywhere in the world) that involved installing an HLMR bearing at / near one of the panel points to effectively replace the pin? RE: Truss Bridge - HLMR retrofit bridgebuster (Civil) 2 Sep 16 13:26 Something doesn't look right with your sketch labels. In a typical cantilever truss, one would expect the cantilever span to be on the left with the suspended span hanging from the vertical. Could you post an elevation view? RE: Truss Bridge - HLMR retrofit EQguys (Structural) 2 Sep 16 13:34 justhumm, Take a look at the first presentation in this video. It is about a project involving pin and hanger replacement at the junction of cantilever-suspended spans. You may get some useful ideas that may be applicable to your rehab project. http://media.aisc.org/NASCC2016/B06.mp4 RE: Truss Bridge - HLMR retrofit justhumm (Structural) (OP) 2 Sep 16 15:13 @ bridgebuster: what I posted were just conceptual sketches that someone else created, so I can't (and wouldn't) trust them as bible verse. ...plus this is a really weird bridge. @ EQguys: Thanks for the link! Now I have something to do this weekend. Happy Labor Day, all! RE: Truss Bridge - HLMR retrofit msquared48 (Structural) 2 Sep 16 16:10 What happens with this joint in a seismic event? Seems questionable to me without some form of movement limiting venue as it would lead to a loss of vertical bearing and collapse. Mike McCann, PE, SE (WA) RE: Truss Bridge - HLMR retrofit bridgebuster (Civil) 2 Sep 16 18:43 @justhumm - are you free to identify the bridge? In the AISC presentation the one relevant to your situation is the first one up. @EQguys - thanks for the link; interesting presentations. RE: Truss Bridge - HLMR retrofit justhumm (Structural) (OP) 2 Sep 16 21:19 @msquared48 At this point, I have no idea what happens to the joint. That's why I am hoping to stumble over a project that actually used this sort of retrofit. :-) Conceptually, I THINK the "safety pin" that was shown on the sketch is meant to limit the movement. @bridgebuster No, I am not at liberty to divulge the bridge identity, right now. I just watched the first minute or two of the video. I'm going to watch the rest of it later tonight or tomorrow. I was actually able to find the bridge plans for that project on MDOT's website. It's not exactly what I was hoping for, but might make good food for thought... http://sp.mdot.ms.gov/Contract%20Administration/DesignBuild/MDOT%20Project%20No%20BR001501120106487301000%20US%2084%20Pin/Forms/AllItems.aspx http://sp.mdot.ms.gov/Contract%20Administration/DesignBuild/MDOT%20Project%20No%20BR001501129106736301000%20Westbound/Previous%20Project%20%E2%80%93%20Bridge%20Plans.pdf (100+ MB file) RE: Truss Bridge - HLMR retrofit bridgebuster (Civil) 3 Sep 16 00:28 @justhumm - Thanks for the link to the bridge plans.