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Hello Thanks for the detailed responses. It's been awhile since doing a plastic design calc, but I do have it in my orginal structures book. It seems that FEA's do a simliar thing as high hot spots (plastic areas) are often ignored rather than spending countless hours on meshing. FEA's seems...

Hello phamENG This is the ref I was refering when mentioning Utimate strength and the plastic region which ASD does not address very much. https://www.linkedin.com/pulse/what-different-between-asd-allowable-stress-design-hasan?trk=pulse-article_more-articles_related-content-card

Hello phamENG UHSS is becoming very common in mobile structures like cranes and Concrete handling Pump trucks. There is considerable weight savings when using it. SSAB is a major suppler of this steel in the US. It will be hard to avoid in the coming future on any machine that is limited by...

Hello According to several sources ASD and LRFD method will come up with eqivalent beams if DL= 3 x LL. If DL<3 x LL than LRFD will give larger strength sections. Does anyone know if this relation is effected by Ultra high strength ateel with a Yield of 100KSI and ultimate stress that is only...

Actually it would be 2 x 4067 x .1= 813N I would use .2 to be safe.

Hello Ia anyone here involved with calculating max possible loads on outriggers given the CG of crane and loads? Or know a consultant that does? Not the pressure loads on the soil but the actual rating for each outrigger. Most of the articles I found assume a very rigid crane and do not...

Thanks for the input. The auto and mobile vehicles seems to have the most experience with these +80 to 130KSI Yield materials. Not sure if they reduce the safety factors used for 50-70KSI materials or not. I guess I will continue to do so till I see otherwise. Using .5 to maybe .6Fy for bending...

Hello Well, we know the info on costs of various prototypes is out there, in various company databases or other computors. But apparently no website or other place where that info is shared. I guess I can not blame them for keeping that info propietary. Thanks for the input

Hello Note that I checked out the allowables stresses based on the AISC rules and found that not much extra allowable stress is given for higher yields like in HSS or even ultra HSS. When the b/t's are high and the section is now a slender section, with thinner walls. I was wondering if the...

Hello If b/t ratios are larger then those in the various sections of 1.9 then a appendix must be used to reduce the allowables. I have been checking older editions 7 and 9. In edition 7 the formula is on page 5-115 to 117. Does the more recent AISC appendix or any other code document Allow...

Hello FEA way. Yes, That does sound the way Inventor Nastran works with a nonlinear turn on. The “acad expert” says it will do non linear buckling and there are some threads in the knowledge base. We Have a subscription so I can talk to them on the phone when we wish. But Going beyond the code...

I called them and they said they where a gold star acad seller in LA. I looked up the company and called it in they never heard of the website

HELLO wheels was chosen. In case anyone is curious. Less friction less risk of shiming or motions. Hevi rails can be considered a type of Cam wheel roller and they come with higher toleranced rails that should be more straight then steel off the shelf.

Hello thanks for the input. Yes I should have qualified the Alum as 6061 T6. One of the most common. With yield of 35 per Alum design. Galvanic corrosion is another definite issue,and over time stainless will definitely look better. Thanks for jogging my memory. Raptor77R. The AiSC uses 1.65 vs...

Hello is anyone familiar with or can recomend some of the more economical conveyor programs. Several are available for under 300 to 50$. You can spend several grand Working on s telescopic conveyor for concrete so have to look at a variety of conditions

Hello in this case there is a Force pushing on the Block. As per OP In the conventional case of a block on a horizontal surface the normal force is totally dependent on the weight. friction is in the horizontal direction that does not affect the weight. In this case and many others the the...

Hello This is a 100ft tele boom, so weight of the Boom is a significant proportion of the load. We got to Mount a conveyor system on top of the Boom so it needs to be flat but maybe on the sides we could use the 4140 pipe. Done a lot of Shafts with 4140. But maybe 4140 pipes with a flat plate...

Thanks for the replies. Waiting on info for the vendors they may have something. I wonder if the new aisc book lists allowables that is based on Ultimate. My book doesn't. I could extrapolate from values in the aluminum design manual till I get better info. They list allowables based on...

Hello I'm looking for some 8 by 8 by quarter inch or more, 100 KSI yield tubing. SSAB.com has some. But I think it's European Steel . I wasn't even sure it existed. It has an ultimate strength of 108 KSI. Very close to the yield. My older aisc book only covers up to 50 KSI. I don't think the...

Hello Note thst there is s error in the words on the reverse block and tackle idea. It is more different then how we do it in cranes. A hard point would still be required. The structure would need to push against the crane, which may not be feasible. The water bags was discounted cause they...