API 650 appendix E
API 650 appendix E
(OP)
Are the moments calculated using appendix E of API 650 service loads or ultimate loads?
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RE: API 650 appendix E
RE: API 650 appendix E
I agree that the loads of Appendix E are service loads.
Be carefull in applying the 1/3 increase in allowable stresses. Codes are eliminating the 1/3 increase. AISC has removed this from their specification.
IBC2003/ASCE 7-02 allow the use of API design codes with use of allowable stresses noted in these codes but specifically state that no increase in stresses is allowed for load combinations for allowable stress design.(See 2.4 of ASCE 7-02)
RE: API 650 appendix E
API and AWWA both give clear-cut methods to use for calculating seismic loads, whereas ASCE 7 drops the ball on the issue. Which is truly ironic, given that the entire purpose of the standard is to specify required loads.
RE: API 650 appendix E
RE: API 650 appendix E
Even though the API loads are service level, the tank bottom plate resistance is based on plastic action.
Steve Braune
Tank Industry Consultants
www.tankindustry.com