We use LEAP Bridge Concrete for prestressed concrete beam design and load rating. We'd like to know if the program takes considerations as described in Section 6A.5.8 of the Florida DOT Load Rating Manual:
6A.5.8—Evaluation for Shear
Replace subsection with: When using Modified Compression Field Theory (MCFT) at LRFD 5.8.3.4.2—General Procedure, (1) Follow MBE Figure 6A.5.8-1, and count the stirrup area intersected by the failure plane 0.5·dv·cot(θ) on each side of the section under consideration, (2) Apply the appropriate load factor. An HL93 Operating rating, for example, would use γLL.Strength.I.Operating = 1.35 in its capacity calculations. See “Prestressed concrete shear capacity is load-dependent,” at MBE Example A3, page A-115.
For prestressed members governed by shear, where RFLRFR.FL120 < 1.00 or RFLFR.HS20 < 1.67, use LRFD 5.8.3.4.2—General Procedure with refined distribution, or LRFD 5.8.3.4.3—Simplified Procedure with approximate distribution. Alternatively, narrate why those procedures should not apply to the bridge or element under consideration (excessive debonding under the web at the governing location, relevant research or load testing, girder condition, etc.).
Reinforced and prestressed slab-type bridges may omit the shear check, provided good condition near the bearing areas. Other concrete bridge types will include a shear check for all vehicles and rating levels assessed.
Thank you.
Yes the program follows Florida DOT Load Rating Manual: if the Florida state option is selected in the project TAB.
Also the user needs to check right options related to FDOT in the Rating Parameter Dialog Box.
if the program is not following any requirement then please to email me the issue and I shall cross check the information for you.
Please don't forget provide your hand calculation.
Answer Verified By: Jian Huang
Thanks.