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...
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...
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...
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...
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...
I am working on an estimate for a client who is looking to put a facility somewhere in the southwest. One site is within a 70 mile radius of Phoenix (don't know the exact location due to confidentiality agreement) They had contacted a geotech in the area and were told that in general the...
In ASCE 7-02 Section 9.5.2.7, there are 2 equations that account for the combination of vertical and horizontal effects. My question is are the effects from the vertical and horizontal combined into a single horizontal force and then into a single vertical force, thus having to use the equations...
Can anyone give me a hand or lead me to a place that can supply local siesmic and wind data for Guinea Africa that can be used in determining forces per ASCE 7 2002 for wind and IBC 2003 for seismic? Thanks
I have been asked to look at an alternate house foundation type. A soil boring and geotechnical report was done. An engineer recommended mini piles or helical piles. There is a good layer of sandy-silt ( 7' w/ N values between 20 and 32) over a weaker layer of silty - clay ( 19' w/ N values 4...
