Appendix 12- Calculation for Seismic 'g' Load Factor.pdf

 

APPENDIX- 12 CALCULATION FOR SEISMIC “g” LOAD FACTOR (No of Pages 2)

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APPENDIX 12

 

CALCULATION FOR SEISMIC `g’ LOAD FACTOR  

a) BASIS The 'g load factor for use in Pipe stress analysis is derived based on the equations specified for "NON-STRUCTURAL COMPONENTS AND EQUIPMENT SUPPORTED BY STRUCTURES" as per CI 1632 of UBC-97.

b) CALCULATION FOR SEISMIC FACTOR Seismic Zone 1 (As per ADCO DOC No.30.99.91.0805). As per Uniform building Code-97, Volume 2, Section 1632, EQ 32-2

Fp = (ap* Ca * lp /Rp) * {1 + 3 hx/hr} Wp Where Fp

: Total Design lateral seismic force

ap

: In Structure Component Amplification factor (UBC-97, Table 16-0, item 3.B) = 1.0 Ca = Seismic Co-efficient (for Seismic Zone -1, Z=0.075 & Soil Profile Sd*, from Table 16-Q, UBC-97)

lp

: Importance factor (from sl no 4 of Tabe-16-K-UBC97/ADCO DOC No.30.99.91.0805)

= 1.00

Rp

: Component Response Modification Factor (UBC-97, Table 16-0, item 3.B)

= 3.0

hx

: Element or component attachment elevation with respect to Grade

hr

: Structure roof elevation with respect to grade

Wp

: Weight of the component / element

m

: Mass of the component / element

= 0.12

*(Soil type is considered as S D as a conservative approach).

FLEXIBILITY ANALYSIS REPORT -ESP WELL AT SHAH Main Contractor

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PLL Project No.: P2AE15 EPC FOR TIE-IN WORKS AT SE

ADCO Project No.: P30214 DOC. NO.30 .71.23.013 REV. A

 

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  For Process plant piping, since a particular pipe routing, in general, will be passing through various elevations, to have a realistic estimation of elevations, an average value of hx / hr = 0.5 is considered. As per the above, Calculated value for Fp=0.1 W=0.1 mg Hence static seismic coefficient=0.1 Static seismic coefficient shall be 0.1g. The above factor shall be applied in CAESAR-II Pipe Stress analysis, in the two horizontal directions, acting non-concurrently, wherever applicable. As per UBC-97 Clause 1630.1.1, Ev= Load effect resulting from the vertical component of the earthquake ground motion, may be taken as zero for Allowable stress design. Hence no vertical seismic component is to be considered for pipe stress analysis.

FLEXIBILITY ANALYSIS REPORT -ESP WELL AT SHAH Main Contractor

Supplier / Sub-Contractor

PLL Project No.: P2AE15 EPC FOR TIE-IN WORKS AT SE

ADCO Project No.: P30214 DOC. NO.30 .71.23.013 REV. A

 

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