Regarding the axial displacement of expansion joints
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When performing calculations for expansion joints, is the axial displacement of the expansion joint positive or negative? For example, whether the displacement resulting from stretching or compression should be substituted using its absolute value. Additionally, if σR is negative, its magnitude does not matter; it can still satisfy the requirement of being less than or equal to [σ]s.
The axial displacement of expansion joints can be positive or negative
This provides an opportunity to discuss how sw6 calculates the axial displacement when fixing the tube sheet.