Dear all
While checking base plate thickness as per Moss book (widely followed by many), can anyone help me to know the allowable stress under bending.

Suppose base plate is designed as per Moss using PV Elite, I understand that two different allowable stresses are used by the software depending on whether overturning occurs or not. Am I right?

That is:

1. If there is no overturning moment 0.66 times Yield is used as allowable for bending

2. In case overturning moment occurs, then 1.5 times code allowable from Part D (1.5 times S) is used as allowable

Is my understanding correct? If so what is the reason for different allowable stress (both results in bending stress in base plate)

Kindly explain me

Thanking You and With regards

SRINIVASAN

_________________
R.SRINIVASAN
Sr. VICE PRESIDENT
Head, Design and Engineering
PED,ISGEC,
YAMUNANAGAR
HARYANA -135001
INDIA

Dear all

Reference: Procedure 3-11 of Dennis R Moss, Third Edition (below figure 3-55)

Further to my earlier posting, I would like to add that capital Fb occurs in denominator of the formula for thickness of base plate given in above reference.

Notation for 3-11 indicates that Fb = allowable bending stress, psi.Hence 1.5 S, where S is the allowable stress as per Section II Part D shall be used in place of Fb. But PV Elite uses 2/3 of yield as the allowable stress. Could some one comment please

Thanking You and With regards

_________________
R.SRINIVASAN
Sr. VICE PRESIDENT
Head, Design and Engineering
PED,ISGEC,
YAMUNANAGAR
HARYANA -135001
INDIA