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  1. aggman

    Pipe Column Transition

    I have been working through the design on a single pipe column fixed at the base to a circular concrete pier. The column is 42" in diameter. I am having some trouble with the anchorage with regards to concrete bursting on the anchor head. This is being controlled by tighter than normal anchor...
  2. aggman

    Seismic Design of Granular Bins (Cd?)

    We are working on the design of a 300 ton elevated rock storage bin. The seismic design category is D. The bin sites on elevated legs, braced in one direction and moment frames in the transverse direction. We are designing to IBC 2006 (ASCE 7-05) and have selected the appropriate R factors...
  3. aggman

    ACI Anchor checks

    I use ASD for my steel design, even with the new code. I know how to use LRFD and am fairly comfortable with it if need be. I have a question though with checking anchor bolts. For a typical industrial structure bent frame (non-building) we typically have a light framed (conveyor) supported...
  4. aggman

    HP 35s for you RPN engineers

    Check out HPs new scientific calculator... http://h10010.www1.hp.com/wwpc/us/en/sm/WF05a/215348-215348-64232-20037-215351-3442983.html I don't want to get a big discussion about how they don't build them like they used to but I bought one because I smoke through a HP 33s about once a year. I...
  5. aggman

    HP 35s for you RPN engineers....

    Check out HPs new scientific calculator... http://h10010.www1.hp.com/wwpc/us/en/sm/WF05a/215348-215348-64232-20037-215351-3442983.html I don't want to get a big discussion about how they don't build them like they used to but I bought one because I smoke through a HP 33s about once a year. I...
  6. aggman

    Epoxy Grout on Base Plates

    I have an application for a large crusher to be supported on a steel structure. I am trying to come up with a good specification on the grout to be used under the baseplates. I am sure that I want to use a high strength epoxy grout system due to the impact, fatigue, etc. In the past we have...
  7. aggman

    Wind Force Coefficients

    I am sure this has been asked but I can't seem to find it anywhere. Does anyone know where I can get a book that discusses the wind load provisions of the ASCE 7? I have the guide to the wind load provisions and this is fine but I want something more elaborate. I really need something that...
  8. aggman

    Pet peeve with contractors

    You know, it always baffels me that contractors always think they know more about engineering than the engineer themselves. Common beliefs are.... A) The engineer always over does the design. If they call out (5) #5 bars then it probably only really needs (2) #4 bars to work. B) Engineers...
  9. aggman

    A question for the Florida Engineers

    We have designed several material processing plants over the past few years in Florida and lower Alabama. As a rule, even if ground water is not an issue, we have always designed the foundations for buoyancy in the hurricane regions. Our justification is that during a hurricane there is always...
  10. aggman

    One Side Open Building

    I have a question that I feel ASCE-7 and IBC are vague about but is fairly common. I have a metal framed building with light gage metal sheeting, girts and purlins. The building is completely enclosed on three sides (no openings) and open completely on one side. 25' short x 58' long, x 65'...
  11. aggman

    IBC 2003 Question Again

    I wanted to get some feedback about what others are doing in seismic design. I typically design structures for industrial applications, mostly for material handling of bulk materials. Typically we are in low seismic regions (C or less) and utilize the ELFP and systems not specifically...
  12. aggman

    Looking up values in a table

    I am trying to write a spreadsheet which will select a pipe based on a certain Section Modulus. I have a cell which contains a calculated section modulus based on stress. I would like to then select a pipe which has a larger section modulus than the calculated one by looking up the values in a...
  13. aggman

    Seismic Load Effect E (IBC 2003)

    For an upcoming job my company will hopefully be designing some non-building (silos/ hoppers/ etc.) in a location where seismic design will control. I don't have that much experience with the IBC, but the seismic load effect E = rho*Qe +/- 0.2*Sds*D is confusing me. My structures are pretty...
  14. aggman

    ACI Shear Anchorage Question

    I have an application where I need to use a shear key on a base-plate to transfer the shear from a steel column to a mat foundation. Uplift = 91 kips, shear = 33.6 kips. I have used the AISC Design guide in the past but I was told to check out the ACI anchorage section as they have a design...
  15. aggman

    Concrete Column Splice

    I have a situation where I have two 30" X 42" concrete columns cantilevered up from a footing 25'. The contractor wants to pour the columns in 6' increments, leaving 3 construction joints in the footer. I looked in the ACI code and could not find anything that specifically said you could not...
  16. aggman

    New AISC Combined Spec

    Looks like AISC has put a draft of the new LRFD/ ASD combined spec on their website. It looks to me like LRFD with a safety factor instead of a resistance factor. And to think I was hoping it would look a little like old green. I'd say their going to force us to change no matter how hard we...
  17. aggman

    Anchor Bolt Type

    I have had some request to use all-thread anchor bolts on a project that is galvanized. I just wanted to get your guy's opinion on using all-thread instead of using normal round rod, with the ends threaded. Assuming material strength is adequate, is their any reason not to use the all-thread?
  18. aggman

    Uplift on Rock Foundation

    Does anyone know where I could get some design information for the design of tension bores in rock. I have a customer that would like to use a 6" drilled bore in rock, place rebar in the bore, and fill it full of grout for tension anchoring for uplift, rather than just use the weight of...
  19. aggman

    Belt Conveyor Truss Design

    I had this post in the materials handling forum but did not get any response so I thought I would try it here. I have been asked to design some standard truss parallel chord frames, with allowable spans for particular belt widths. The trusses are to carry limestone and coal, and are to be...
  20. aggman

    Belt Conveyor Truss Design

    I have been asked to design some standard truss parallel chord frames, with allowable spans for particular belt widths. The trusses are to carry limestone and coal, and are to be designed to support all the bells and whistles, (walkways, hoods, idlers, pull-stops, and electrical). My question...

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