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Hello, I am designing a concrete pedestal and foundation to support a Ball Mill. Ball mill weights about 725 kips and its in Seismic zone category F. I am looking for a references, papers, software program that I can use. This is first time, I am dealing with Ball Mill. Your help is appreciated...

Hello, Existing Single story Concrete shear wall is 80'-0" Long and 36'-0" High. Now we need to add 12'-0"x12'-0" Opening in to this existing wall. I am looking for any referances/thoughts on how to analysis it. I am thinking to provide steel tube frame (Col-Beam) around the new opening. Your...

I agree with StructuralEIT and also try to get extra strain capacity by providing a sleeve, As JJPellin mentioned sleeve will give more strain/stretch. So its good idea to Design AB per ACI-Appendix D and provide a sleeve as short as possible rather than whole embedment length of AB.

I agree, J bolt is not good in tension and so we have AB with Heavy Hex Nut. The Sleeve is not above the surface of block so sleeve will not see any compression. Anchor bolt is designed using ACI Appendix D which does not consider sleeve. Since manufacture shows sleeve, it is good to get more...

Thanks Johhny, How to decide sleeve pipe diameter. Can we use, Bolt Diameter + 1/2". To hold down FD & ID Fans (Centrifugal), we are using bolts diameter ranging from 7/8" to 1.5" Dia bolts with varing embedment lengths (at least 12"). Also can we call sleeve length is 1/2 or 2/3 of embebment...

Thanks Johnny, This explanation is very useful to me. Thanks!! Abhijit

Does it means Steel fails first before the concrete cracks???

Its a through bolt with steel Pipe sleeve and bolt is J-type

Hello, Fan manufacture drawing shows anchor bolt with Sleeve. My question is, what is the reason to provide sleeve? Thanks,

Thanks cds. u r right, frequency chages and so the ratio of natural frequency to machine frequency will change. Natural frequency is not changing as soil & foundation paramters remain unchanged. At what frequency, we should design the foundation. Does that means we should check maxi. amplitude...

Thanks cds!! That means my design, as mentioned in my post above, is OK at start ups & slows down (Since frequencies are less then operating frequencies and are almost 1/3 of opertating frequency) Also my foundation frequency includes soil factor (damping) in calculation of frequency. so I think...

Thanks csd72. I am also looking to estimate natural frequency of foundation. I am designing foundation for a fan of 1200RPM & 1800RPM and Natural frequency I got are close to 8Hz and 9Hz. That means my ratio of frequencs are 0.4 & 0.3. The same foundations are also satisfy the weight ratio...

How to interpret the Ratio of Resonanace frequency to Natural frequency (What it means if the ratio is greater than 1 or less than 1) What is the acceptable limit? Thanks in Advance Regards, AbhijitM

Thanks DearthSoilsGuy

donmax: I am also looking for the same thing. thread256-110197 is useful. Do you find anyother reference? Thanks,

I am looking for a information/guidelines/examples on design of Machine Foundations. I found the useful thread256-110197 and could not able to open the web link provided by SlideRuleEra (Structural) Does anyone have those paper or similar resources availiabe. Your help is greatly appreciated...