TpaRAF
Structural
- Oct 22, 2002
- 59
I need some insight on the AASHTO LRFD Bridge Design specs.
Section 5.10.8.2 states shrinkage & temperature reinforcement should be 0.18% of the gross sectional area for members less than 48" thick. The AASHTO LFD code required 0.125in² per ft of surface.
I am designing a bent cap that is 42" square. The LRFD code requires 3.18in² temp steel, while the LFD code requires only 0.44in² (1.75in² for 4 faces) - this is a BIG difference.
The AASHTO LRFD commentary cites use of ACI 318. In that code, the discussion is limited to slabs only (§7.12).
My inclination is to use the smaller value, but I cannot justify this decision within the limits of the LRFD code.
Thanks in advance for your help!
Section 5.10.8.2 states shrinkage & temperature reinforcement should be 0.18% of the gross sectional area for members less than 48" thick. The AASHTO LFD code required 0.125in² per ft of surface.
I am designing a bent cap that is 42" square. The LRFD code requires 3.18in² temp steel, while the LFD code requires only 0.44in² (1.75in² for 4 faces) - this is a BIG difference.
The AASHTO LRFD commentary cites use of ACI 318. In that code, the discussion is limited to slabs only (§7.12).
My inclination is to use the smaller value, but I cannot justify this decision within the limits of the LRFD code.
Thanks in advance for your help!
