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  1. koo

    PE Stamping Cost

    guys, got a pricing question about additional charge if I am asked to stamp the calculation and drawings for connection design. I didn't stamp them before and only submit calcs. for others to stamping (EOR). Now they want me to stamp it. What price diff. does it make on an hourly rate basis...
  2. koo

    what steel connection design software is commonly used/accepted?

    looking for a AISC based connection design program, better have dimmension and calc. sheet output. Which one is most commonly used?
  3. koo

    Staad gives axial load in girder of a simple bridge?

    I modeled a simple composite steel bridge in Staadpro 2002. Deck is modeled as plates, girders as frames, bolster as frames. HS20 moving load. But the oupput gave me large axial Fx load in girders and lateral reactions at supports (pinned), even larger than vertical reactions! Where could...
  4. koo

    height limits for different systems?

    Hi, I'm doing a prelim. design for a undergrade roadway, 600' long. I am considering different options for the earth retaining systems. The largest grade difference is about 40' in the mid section. MSE, pile and lagging, anchored sheetpiles are all under consideraton, but I'm not sure what...
  5. koo

    any good book for modeling bridge?

    This site has been very helpful. I searched past posts for modeling methods, but couldn't find much details. I just started learning modeling bridge in SAP or Staad, mostly by trial and error. Are there some good books/manuals describing computer modeling of deck and bridges? I know...
  6. koo

    sap bridge deck modeling

    Hi,sap people, I just started modeling a steel girder composite deck bridge in sap 7.12v. Say simple span, 4 girders 60ft long with 6ft spacing, 8 inch concrete deck. I saw posts here discussing modeling the deck with shell element, but I read the sap reference manual and it says that the...
  7. koo

    Deck modeling with SAP 2000

    Hi,sap people, I just started modeling a steel girder composite deck bridge in sap 7.12v. Say simple span, 4 girders 60ft long with 6ft spacing, 8 inch concrete deck. I saw posts here discussing modeling the deck with shell element, but I read the sap reference manual and it says that the...
  8. koo

    Can anyone explain masonry plate?

    I saw bearing details for elastomeric pad sitting on top of a masonry plate, and some sitting directly on abutment seating or an elevated concrete pedestal. Why do you need a masonry plate? in what situation? Can anyone answer? Thanks. Koo
  9. koo

    P/S box beam end reinfocement

    Hi, I have a p/s spread box (BII-48x33, 48 strands) bridge, simple span. AASHTO 9.22.1 requires vertical stirrups at anchorage zone. Can someone explain why they are needed? My calculation requires 4 sq.in. steel within 6 in. of the end of the beam. It seems to me that it's difficult to fit...
  10. koo

    bridge load distribution

    Hi, everyone, I'm a new member and looking for some advice. I have a prestressed spread box girder bridge, and I am trying to determine the distribution factor for interior girders. Use Eq. 3-33 in AASHTO give me 0.745 vs. 0.886 from S/7. (BTW, 1.03 for exterior beam using simpe beam...

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