Reduced Intersection - CAESAR II - Help

CAESAR II Users Guide

Language
Русский
Product
CAESAR II
Search by Category
Help
CAESAR II Version
12

Defines the code rules for reduced intersection. Select one of the following options:

B31.1 (Pre 1980)

Use the pre-1980 B31.1 code rules used for reduced intersection. These rules did not define a separate branch SIF for the reduced branch end. The branch stress intensification factor will be the same as the header stress intensification factor regardless of the branch-to-header diameter ratio.

B31.1 (Post 1980)

Use the post-1980 B31.1 code rules for reduced intersections. The reduced intersection SIF equations in B31.1 from 1980 through 1989 generated unnecessarily high SIFs because of a mistake made in the implementation. (This is according to WRC329.) For this reason, many analysts opted for the pre-1980 B31.1 SIF calculation. CAESAR II corrects this mistake by automatically setting B31.1 Reduced Z Fix to True (the default setting). You can vary the status of this flag in the CAESAR II configuration file to generate any interpretation of B31.1 that you want. The default for a new job is for B31.1(Post 1980) and for B31.1 Reduced Z Fix to be set to True.

The No RFT/WLT in Reduced Fitting SIFs option also affects the SIF calculations at reduced intersections.

WRC 329

Use the recommendations of WRC329 for reduced intersections. A reduced intersection is any intersection where the d/D ratio is less than 0.975. The WRC329 recommendations result in more conservative stress calculations in some instances and less conservative stress calculations in others. In all cases, the WRC329 values should be more accurate and more in-line with the respective codes intent.

ASME Sect. III

Use the 1985 ASME Section III NC and ND rules for reduced intersections.

Schneider

Activate the Schneider reduced intersection stress intensification factor multiplication. Has the same effect as Use Schneider.