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AASHTO LRFD's Longitudinal Steel Check (LRFD 5.8.3.5)requires additional longitudinal reinforcement due to shear. I have seen conflicting information regarding the requirement for this additional steel (Al) in a concrete bent/pier frame cap. 2007 AASHTO LRFD 5.8.3.5 states: "The area of...

AASHTO LRFD's Longitudinal Steel Check (LRFD 5.8.3.5)requires additional longitudinal reinforcement due to shear. I have seen conflicting information regarding the requirement for this additional steel (Al) in a concrete bent/pier frame cap. 2007 AASHTO LRFD 5.8.3.5 states: "The area of...

Leave it to Yakpol to beat me to it! Anyway, it is worth repeating!

I am designing a "Through Plate Girder" - Single Track, Simple Span Bridge for BNSF and they are requiring a built-up bolted bottom flange because it is an Underpass. I wanted to ask the forum if you know of any design examples (go-by) for the Through Girder Design and the Knee Brace Design...

I have found a website called www.ExcelCalcs.com where you can download free software, called "XLC" to make your Excel workbooks read like text books by displaying cell formulas as mathematical equations. There is also a fanatastic REPOSITORY OF SPREADSHEETS created by members and a supportive...

Thanks MICHST. I appreciate your looking into it. I am checking with another source too and I will post anything I learn. Keep up the good work!

I am designing a Through Girder RR Bridge for BNSF and I need help with the intermediate stiffener. I am bolting a WT stiffener to the web for the intermediate stiffeners, but I can't find anything in the AREMA code to give me a criteria for designing the bolted connection. (AISC had equation...

Thank you Andy10, I will look into that.

The main reinforcement is generally parallel to the traffic (with a 60 degreee skew to the Highway).

Thanks jimaitken! I think I will do that and do the same for the OK overload truck too. Happy New Year!

I am designing an "at grade" (Cover < 2'-0") RCB using AASHTO LRFD. The State DOT I am in specifically requires us to use LRFD for RCB's. The LRFD Code only requires the full analysis for HL93 and Lane Load if the supporting walls are > 15 feet apart. I am designing a Triple 10'(W)x6'(H)...

Thanks bridgebuster! Oklahoma specifically requires us to use LRFD for RCB's. The LRFD Code only requires the full analysis for HL93 and Lane Load if the supporting walls are > 15 feet apart. I am designing a Triple 10'(W)x6'(H) reinforced concrete box and the code says "Where primary strips...

I am designing an "at grade" (Cover < 2'-0") RCB using AASHTO LRFD. The spans are < 15'-0" and the code says to design for a 32 kip axle load. I have a three barrell box and I am wondering if that 32 kip load is acting alone and moved across the three spans for maximum forces or is it multiple...

In the LRFD, or any other AASHTO code, I don't understand the statement in the LRFD commentary for Stability of Elastomeric Bearings, C14.7.5.3.6, "This freedom to move horizontally should be distinguished from the question of whether the bearing is subject to shear deformations relevant to...

...soil borings indicate water will be present for a significant length of the 1700 ft structure. Should I assume a Ko of, say 0.5, and find the soil pressure with Pe=0.5*(gamma soil - 62.4 pcf) + 62.4 pcf? Thank you for your time. Any information the forum can offer would be greatly appreciated.

...soil borings indicate water will be present for a significant length of the 1700 ft structure. Should I assume a Ko of, say 0.5, and find the soil pressure with Pe=0.5*(gamma soil - 62.4 pcf) + 62.4 pcf? Thank you for your time. Any information the forum can offer would be greatly appreciated.

I am trying to write an concrete column interaction spreadsheet and I need to solve several cubic equations at once. Should I use GOALSEEK or SOLVER? How do I get the spreadsheet to solve more that one equation at a time? Thanks

I tried to do that, but the rows are in the middle of the spreadsheet and the print preview showed that it started a new page on either side of where I stopped and started the PRINT AREA. Now that could be because I have title rows repeating at the top of each page.

I have a spreadsheet that shows some reinforcing choices in a few rows and I would like to have them visible to the user, but not print them in the output. What is the simplest way to do this? (FYI: There are hidden rows in the spreadsheet.) Thanks

Thanks for your reply "tincan"! The bottom of rail of the dual track portion is around 4.5' to 5.5' above the top of the RCB. Another area has multiple tracks and will temporarily be 16'+/- above the top of the RCB.