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  1. dbags

    Elastomeric Bearing Splitting

    I found the source of the problem through email converstation with Roeder & Stanton of University of Washington. They believe it is likely "the vertical slot that occurs in the rubber cover is caused by a vertical keeper bar that holds the horizontal plates in place during fabrication...
  2. dbags

    Elastomeric Bearing Splitting

    I have a condition on a new bridge in service for approximately 2 years. The bridge is a 5 span continuous plate girder bridge on a horizontal curve (r=650'). The round steel reinforced elastomeric bearings at the abutments have formed vertical cracks (typically 3 per bearing at about 120...
  3. dbags

    sizing roof drain dry well

    cvg, Thanks for the info. If I spec a round pit filled with 3/4" to 1-1/2" rock, what is the storage capacity? I've seen calculations in which 25% to 50% of the volume of the pit is used as the storage capacity? Does that assume you have 25% to 50% voids for storage? I have no problem being...
  4. dbags

    sizing roof drain dry well

    It is the 1/2" precipitation over 24 hours. 1/2" x area of roof will give me the runoff volume. What is the storage capacity of the dry wells?
  5. dbags

    sizing roof drain dry well

    I have to size dry wells for a residential house roof leader for a 1/2" rainfall. I remember that the calculation is quite simple, but I cannot remember the specific equations. Can anyone help refresh my memory with how to determine the number and size of dry wells needed for this application?
  6. dbags

    Minimum roof pitch

    I am working on a home addition and I have a problem with the geometry of the new roof. I am trying to tie the new gable roof into the existing gable roof at 90 degrees (commonly called a cross gable configuration). The existing gable is very shallow so in order to tie into the existing roof...
  7. dbags

    Heating & welding high strength bolts

    Is there specific material tests available to determine if the welding did compromise the a449 q&t bolt?
  8. dbags

    cell libraries

    I am using Microstation/J and have found the default cell libraries to be limited. Looking for a source that has a more abundant source of architectural cell libraries?
  9. dbags

    osb exposured to moisture

    I am working on a residential house in which the 3/4" t&g osb subfloor was exposed to excessive moisture due to delays in roof construction (approx. 2 months worth). The subfloor is supported by 2x10 floor joists @ 16"oc. Overall, based on a limited visual inspection, some minor...
  10. dbags

    Concrete Pier Cap Design

    We are designing multiple two & three bay reinforced concrete pier bents. We are utilizing LRFD and have found for the cap beam design that the ultimate moment never controls. The overwhelming control is distribution reinforcement for crack control. This typically results in the need for an...
  11. dbags

    How many US DOT are currently using AASHTO LRFD for bridge design?

    ConnDOT = LRFD
  12. dbags

    Anchor Bolt Proof Load

    We have specified the use of ASTM A449 2.5" diameter galvanized anchor bolts for bearings supporting a box girder. We specified that the bolts shall be tightened to a proof load of 449KN. My question is two fold: First, the contractor has complained that this load is astronomical and...
  13. dbags

    Design Information on Elastomeric Bearings for Bridges

    Three real good references: A "Bridge Crossings" article at the following website: http://www.aisc.org/Content/ContentGroups/Modern_Steel_Construction3/June_1997/BridgeXings_No07.pdf A NSBA publication at the following website...
  14. dbags

    Anchor Bolt Design

    Can anyone help me find a good reference(s)/example(s) regarding the design of anchor bolts for a sign support? The base plate is circular, the column is circular and the anchor bolts are in a circular pattern. I have many references with square/rectangular base plates and bolt patterns...
  15. dbags

    Heating & welding high strength bolts

    rpoche, It is very well hidden. Table 1-C; page 4-4 in the lower footnote area. What do you think?
  16. dbags

    Heating & welding high strength bolts

    AISC 9th edition indicates that quenched and tempered high strength bolts should not be heated or welded. Can anyone explain this restriction? What is the affect on the high strength bolt properties? If heating is a problem, why can these bolts be hot-dip galvanized?
  17. dbags

    Need Reference for P-T bridge pier caps

    You may want to consider consultation with your local DSI (DWIDAG Systems International) representative. They are typically helpful and obviously interested in seeing their product in service. Anything that you may find regarding this subject would be of interest.
  18. dbags

    Need Reference for P-T bridge pier caps

    Were you successful in finding a post-tensioned bridge pier cap example? I am also interested in such an example?

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