The sketch is very close to the actual situation, the only difference is that the (12)- #11 have hooks on top in the pier and the ties in the drilled pier seem to be light at #4 @ 23" spiral. Like I said above Chapter 12 gives a minimum of 7'-2" but based on the actual geometry I think it should...
Thanks for the quick response I should have made my problem a little clearer. The anchor rods into building pier checked per Appendix D. The question is the splice length required for the(12) - # 11 vertical dowel bars that tie the building pier cap to the 8' diameter drilled pier and splice...
A question, I have been asked to review some calculations and they are using Appendix D to calculate the development length of building pier dowels into a drilled pier. I believe that the dowels don't fit the definition of an anchor so Appendix D doesn't apply the length should be calculated...
A question has come up in our design of a cut and cover subway station. Can walls be exempt from minimum shear reinforcement requirements of section 11.4.6 even though not specifically mentioned in the exemptions? Some say no because they are not specifically mentioned, however they are similar...
Thanks for the responses. The life line is for tie-off during maintenance. The cable is inspected prior to each use and replaced with a new cable if there is a fall. The tie off cables are maximum of 22' long connected to the structure through an anchor shackle to a lug at each end and there are...
I am designing a horizontal life line and OSHA says to use a minimum safety factor of 2 for the system. My question is what safety factor would be appropriate to use on the breaking strength of the wire rope? A typical SF of 5 which is used for slings and lifts seems to be high. Thanks. TCV
I have a problem where some anchor rods are located in the wrong spot. Instead of cutting off the base plate and re-welding would it be possible to use an expansion anchor (25mm diameter) 70mm away from the existing anchor rod and cut off the existing rods? The existing the bolts have loads that...
Thanks masrizal, The end of your post said there is a rapid test to check if the mix is acid resistatnt but it didn't show in the post. Can you post it. Thanks again
They are going to use a barrier coating in acid wash and hydrochloric acid storage but it wouldn't be cost effective in the rest of the plant areas which aren't as corrosive. Thanks for the response
I have been asked to specify a concrete mix which will be in contact with wash down water which will be sea water, diluted cyanide and acids. At this point sugestions have been to use higher strength concrete 40 Mpa, use 75 mm cover to the rebar and add silica fume or a pore blocking and/or...
I have been asked to specify a concrete mix which will be in contact with wash down water which will be sea water, diluted cyanide and acids. At this point sugestions have been to use higher strength concrete 40 Mpa, use 75 mm cover to the rebar and add silica fume or a pore blocking and/or...
To answer the 3 responses:
The owner designed the press and doesn't have any loads other than the dead wt. of the machine. (45 tons) Foundation is under sized for the rule of thumb. It has been operating for about 30 years. The pier that failed has failed twice before and been repaired by...
I am a civil engineer looking at a 300 ton stripping press foundation that has failed twice before and is failing again. The client gave us the wt. of the press as 45 tons but no other additional loading. They designed the press themselves. It looks like the foundation and the two previous...
Thanks for your responses. This project is in NYC which does not use current codes.??? I'm not sure how they solved the problem I was just asked to look at it, I did the foundation design and the person reviewing the structural passed away. CSA-S16.1-94 (Canadian Steel Spec.) Section...
Hi,
Has anyone ever come up with the situation where you have steel coming from over seas with metric bolt holes and the design was for imperial bolts? My question, the holes for 3/4" A 325 bolts in a bearing connection are 22mm (7/8") where by code they should be 21.4mm(13/16"). An oversize...
