While the users guide provides useful interpretation to the code clauses regarding steess analysis, there appears to be an error in correlating the relevant code clause i.e. 4.6.2.1 , 4.6.2.2. as indicated in the description below i.e. such clauses do not exist in the code. Its appreciated if this correction be provided in a revised users guide.



SAR II User's Guide 977
CAESAR II assumes that Section 4.6.2 of the Z662 code establishes a requirement for the allowable operating stress of 0.9 x S x T whenever the net axial stress is compressive in the absence of bending stress, and an allowable operating stress of S x T when the net axial stress is compressive in the [/color]presence of bending stress.
Section 4.6.2 requires [the following:
1. The reduction of the axial expansion stress by the product of Poisson’s Ratio and the pressure hoop stress.
2. The addition of the hoop stress to the axial stress.
The latter represents the calculation of stress intensity when the axial stress is compressive, implying that there is no longitudinal pressure stress in buried pipe (the longitudinal pressure thrust loads are transmitted directly to the soil). CAESAR II handles these requirements, in the operating load case, in the following manner:
1. If FAC is 1.0, the piping system is fully restrained in the axial direction as described in Section 4.6.2.1, and the operating stress is calculated as:
Sh + E a (T2 - T1) - v Sh < 0.9 S x T
2. If FAC is 0.001, the piping system is buried, but the soil supports are modeled (rather than just assumed to be fully rigid). This setting removes the longitudinal pressure stress from the equation (as described above), and takes bending stresses into consideration, as required by Section 4.6.2.2.1. In this case, the operating stress is calculated as:
Sh +Fax/A + Sb - v Sh < S x T
3. If FAC is 0.0, the piping system is either not restrained, or is a freely spanning or above ground portion of a restrained line, as described in Section 4.6.2.2.1. In this case, the longitudinal pressure stress is restored, so this formula only comes into effect if the net axial stress including pressure is compressive, in which case the operating stress is calculated as:
Sh +Slp + Fax/A + Sb < S x T
4. CAESAR II does not do an operating code stress check for those elements for which the net axial stress is longitudinal.
5. CAESAR II does not check for buckling, as required by Section 4.6.2.2.2.

I'm sure those Code references were correct at the time we wrote that section of the documentation.