Recent content by gonutsdonuts

Hello, I'm looking to potentially design a secant pile wall for a project we're working on. For a typical secant pile wall there are "soft piles" and "hard piles" - where the soft piles are constructed first and the hard (or reinforced) piles are drilled right through them. I was wondering...

Hello, I'm curious about the origins of the moment magnification approach for considering second-order effects. Does anyone know if it is based on a mathematical derivation? Or was it instead based on experimental research? Does anyone know the original source for the moment magnification...

Hey all, I feel like I'm losing my mind. I'm trying to estimate a load demand due to lateral creep and shrinkage on a column/drilled shaft combination we have and then compare that to a FEA output from our model, but I can't get anywhere close. My approach has been to take the stiffness of...

Hey all, I'm a bridge EIT stuck on a little deck design question that I can't really find explicitly said anywhere in AASHTO (or anywhere else online). If the entire design tandem is to be included in the deck design it presumed to be distributed over a larger equivalent strip. Is this strip...

Hello All, I'm looking into an abutment that's supporting a bridge through PTFE disks at the bearings. AASHTO gives us the disk's coefficient of friction at the service limit state (under very slow movement), but refers to the seismic loop diagram for the seismic coefficient of friction. I'm...

Yes, SteelPE, I'm trying to brace the steel section from buckling laterally. The existing concrete girders are connected to a deck at the top. We are trying to brace the steel girders to the adjacent concrete girders. Only one bolt is used because we needed to allow for rotation. Is the 2...

You're right. This is my first project and it's stressing me out a bit. It's also a really unusual connection for a really unusual retrofit. I've attached an old sketch of the connection I did. The relative elevations are really exaggerated, but the general idea is that the concrete and steel...

Hello All, I'm currently working on some bracing connections and I'm concerned about relative deflection between the two points we're bracing between. Through doing some hand-calcs it looks like there will be 0.239" of relative deflection (conservative) which would require the brace to...

Right, but is the required brace load per brace the same if I have bracing every 10 feet versus every 5 feet? I can see the stiffness required actually increases as the braced length reduces; which intuitively doesn't make any sense.. but does the required brace strength changed at all?

Hello All, I'm wondering if the beam bracing requirements of App. 6.3.1 of AISC, 14th ed, for nodal bracing can be divided (equally or partially) among the total number of braces provided along the span. It seems like the braces would all help resist the beam as it started to laterally buckle...

Thank you. Do they measure out 100 ft in the span direction, walk until they're between the two spans, and then measure the distance to the pole?

I'm in the process of reviewing an excel sheet used to calculate pole capacity. One of the engineers calculated the term "pull (ft)" but I'm not sure what the use for it is. I've attached the picture he sent me when I asked him about it. He's pretty difficult to get a hold of so I was hoping...