seismic interpretatio by hari lal,ongc.Full description
Descrição: Geologia Estructural y del Petroleo
ASCE Example Problem
For further information on the Seismic Wizard see the example below. The Importance Factor IP = 1 The Component Response Modification Factor R P = 12.0, from Table 13.6-1 for "Piping in accordance with ASME B31…",
The Mapped MCE Spectral Response Acceleration S s = 1.552, Mapped MCE Spectral Response Acceleration at short periods in accordance with section 11.4.1. The Site Coefficient (F a) = 1.0 for Site Class D, according acco rding to Table 11.4-1. The Maximum Considered Earthquake MCE S MS - The MCE is adjusted for site class effects as defined in Section 11.4.3, SMS = Fa SS = 1.552 SDS - Design elastic response acceleration at short period (0.2 sec), from Section 11.4.4. SDS= 2/3 SMS = 2/3 * 1.552 = 1.0347 The appropriate seismic acceleration is a H = [ (0.4aPSDS) / ( RP / IP )] ( 1 + 2z/h) = [(0.4 x 2.5 x 1.0347)/(12.0/1.0)](1 + 2 * 0.5) = 0.17245 Check limits on a H: aH <= 1.6 * S DS* IP = 1.6 * 1.0347 * 1.0 = 1.65552 aH >= 0.3 * S DS * IP = 0.3 * 1.0347 * 1.0 = 0.31041 aH = 0.31041 aH = 0.2 SDS= 0.2 * 1.0347 = 0.20694, Section 13.1.7 states, "The earthquake loads determined in accordance with Section 13.3.1 shall be multiplied by a factor of 0.7." aH = 0.7 * 0.31041 = 0.2173 av = 0.7 * 0.20694 = 0.1149 CAESAR II will display the calculated gravity factor on the Uniform Loads tab.
