At first when I did the overturning calculation and the sliding calculation, I added the weight of the water above the heel like if I was designing it to retain soil. But the more I think about it, I feel like I should not. If I do not add the weight of the water, it seems impossible to do...
Hello, I was assigned to help design a small plastic structure. My background is more in concrete. I modeled the structure using FEA. The structure will be buried and loaded with soil cover and vehicle load. My questions are the following:
1. What shall I use as my limiting factor? Shall I...
Guys, I am having another engineering discussion with my coworker. Let's say you have a concrete beam simply supported 10 ft long. You have 10 kips factored point load that can be anywhere on the beam. The beam has 12" d distance. What Shear load would you design the beam for? Let's neglect...
On appendix D, the ANC is calculated from the center of the bolt. If I add a thick custom washer, is there a way to increase this number? I feel like my ANC should be higher? Does Appendix D cover this anywhere?
Lets say you have a large unreinforced slab (infinite thickness) and you embed a rebar vertically ld deep. Do you think the bar will yield before the concrete breaks? Appendix D cone shear calc is only for headed stud or hook. I think the rebar will yield before the concrete breaks but my...
I am creating a spreadsheet to design a cantilevered retaining wall per AASHTO LRFD. I feel like I am missing something. When I add key at the bottom of the footing, I will increase my triangular load of my active pressure. But then my passive pressure on my key isn't that high because I use...
Ladies and gents,
I am having a hard time following A13.3.1. My main question is, what happpen if my wall is retaining some soil load, then on the top of the soil, the wall acts like a barrier for collision force TL-3? Where do I start?
Thanks
Ladies and Gents,
I am designing a cantilevered wall with exposed footing (toe and heel doesnt have soil on top. Wall just sits on the ground). I am trying to design it with LRFD and ASCE 7-10. I understand that ASCE 7-10 wind load has been factored already (higher speed). So when I...
Guys,
If I am understanding correctly the friction coefficient in front of the shear key is soil to soil (approximately TAN phi), and the friction behind the shear key is concrete to soil (approx 2/3 * TAN phi). My question is, how do you split up the vertical forces? How much contributes to...
Lets say I have a rebar that I need to splice (transfer the tension force to another rebar), but the transverse distance (ACI 318 12.14.2.3) is too far apart. What are my options? Can I make the lap length longer?
Guys, if you look at IBC 2012 Equation 18-1, it looks like the equation is still exactly the same as IBC 2009. However, if I am not mistaken, IBC 2012 refers to ASCE 7-10 while IBC 2009 refers to ASCE 7-05. My question is the windload. If I am not mistaken, the windload for ASCE 7-10 is...
Guys,
Let's say you are analyzing a square lightpole. For AASHTO under table 3.6, it is giving us Cd value that is larger for diamond shape (wind direction 45 degree of a square x-section). That means if I analyze the pole with with 45 degree direction, not only I am making the normal area...
Guys and gals, I am doing a R&D on a connection for a product. We are connecting an A325 1" dia bolt through a very elongated hole (1 1/16" wide). The plate has been modeled on FEA. Now I want to make sure that a standard hardened washer will work for this application. Do you guys know what...
I thought I understood it completely but now I have a disagreement with a coworker and we are not sure who is right. Let's say you put a welding symbol on a drawing, do you put the leg size or the effective throat size? It seems more sense if you put the leg size. This website for example...
I understand the reason of maximum weld. You do not want to burn through the thinner member being weld. But what is the reason for the minimum weld? Can someone give me a reason why I cant use 1/8 weld on each side of a 5/8 plate connected to another 5/8 plate. I need smaller weld to gain...
Let's say you design a basket that is being used to lift a heavy product that has wheels. The product will be rolled into this basket. Then the basket will be lifted by a crane. It is pretty clear to me that I need to make sure I have 5 F.S. on the cable, shackle, connection to the cable (most...
It is always confusing every time I review lifting capacity of a sling. So we got a quote from this company. We wanted to buy a 4 leg bridle (see the link for the type 400). Here is their technical info on the product ...
When you design retaining wall and you have live load surcharge. Do you add the vertical live load surcharge to the heel? Or do you only apply the horizontal? It seems having LL surcharge helps my over turning instead of hurting.
I was asked to design a 2 way slab using fiberglass FRP. I am having a hard time understanding the Vc calculation (eq. 9.1 or ACI440-1R). By using this equation, I have a much lower Vc than if I was using steel OR unreinforced. I have checked my mathcad equation and everything seems correct...
