Questions regarding seismic loads
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When considering the combined strength and stiffness of the nuclear saddle web and stiffener plates, which direction is the seismic force taken into account, and why? What about checking the anchor bolts?
Page 44 of the explanatory notes for the formulation of NB/T47065.1-2018 standard for saddles states that it applies only to horizontal seismic forces.
They are all horizontal seismic forces, but the directions differ; when checking the bolts, the direction of the seismic force is along the axial direction of the equipment
The bolt direction, whether in the x or y direction, should be determined by the mode, right? However, in the standards for steel horizontal vessels JB/T 4731-2005 and the new NB/T 47042-2014, the checking of the saddle is based on the axial direction of the vessel shell, as this is the direction with the best resistance to bending ； New p95 7.8.3 Bolt Verification [Original 7.4.3]