Have an existing X-Shape lifting device that I have been asked to determine a rated capacity. The device appears to be of the type where someone in a shop through some shapes together and used it to lift something in the past without ever being engineered. I say that because of how the device...
Analyzing this existing rectangular slab for some additional loading. The slab was designed in the mid '50s and I don't quiet understand the details. It appears to be a one-way slab, with two reinforced monolithic beams spanning top to bottom within the 20' x 20' grid. With one side being 20'...
Oengineer: Not that I am aware of. It's the same loading condition, just different shape, so you would just use the radius of the HSS shape for the "b" term instead of half the depth.
@oengineer: The equations in my previous post are only for checking the local effects of web tear out under an eccentric load. You will need to evaluate the strength of the HSS tube, the connection weld, the local web tear out strength, and the column strength due to an eccentric load. Those...
Asktomuch: The permeability of concrete to water depends mainly on the water-cement ratio (which determines the size, volume, and continuity of capillary voids) and maximum aggregate size (which influences the microcracks in the transition zone between the coarse aggregate and the cement paste)...
Koot: That is an excerpt from some training our chief engineer provided to us new civils within the company on how to attach hangers to an existing I-beam. We were taught to analyze the local effect using the appropriate ROARK case and then check global torsion like you mentioned.
Jayrod: The diameters vary from around 4" up to around 16". The floor supports operating equipment and receives light foot traffic from operations. It also occasionally is used lift loads from lower stories.
Your idea sounds far better than what I came up with. Thank you for sharing that thought.
Have an existing, elevated 9" thick concrete slab with several penetrations through it that have been requested to be filled to eliminate tripping hazards. Each penetration is void and has a grout ring and steel cover plate installed over them (see attached picture). It appears each penetration...
@Celt83: Thank you for the link, I will look into it.
@MIStructE_IRE: I agree. In the real world, for the sake of time and simplicity, I would conservatively assume the first column as a cantilever taking the entire load. Just wanted to educate myself on the theoretical approach to this type...
All,
I have a conceptual question regarding calculating the support reactions for a multi-bay frame supporting an out-of-plane load. Please see the attached sketch. All the literature I could find deals with loads in the same plane as the frame.
Without modeling, I am looking for a way to...
All,
I am reviewing a foundation drawing for a vertical vessel that was designed by the M.W. Kellogg company in 1965. I need to evaluate the anchor bolts for an additional loading scenario. The original drawing I found only list an anchor bolt code (Size 22, Type CU, P 30) for the anchor bolts...
I think I follow. My mistake is that I had analyzed the continuous beam separately from the frame, and then used the vertical reactions of the continuous beam at each support to size the column while assuming each cap-plate connection to be of the pin-type. I then used the shear and moment...
HotRod10: I calculated T = 1.69 k/in. (V=22k, I=635in^4, Q=48.64in^3). From there I divided that by the two welds to get a shear force of 843 lbs/in. I then divided this by the allowable shear stress of 9600w, to get a required continuous weld leg size of .088". If I use a 1/4" fillet weld...
Agent666: I plan to use a 1/2" thick cap plate. From the shear-moment diagram I drew for the continuous beam, I picked the worst-case moment at each of the support locations to use in the analysis of the weld that connects the column to the cap plate, as well as the bolts connecting the cap...
JAE: Thank you for catching that. Slotted holes sounds like a better option.
Question:
On the topic of slotted holes... The beam is supported by four columns with cap plates. Each cap plate has four bolt holes, placed within the beam flanges, to bolt to the bottom flange of the I-beam. The...
