Seismic Loads per IS 1893 Part 1 2002
For plant structures designed under Indian codes, the program calculates the seismic load per IS 1893 Part 1 Criteria for Earthquake Resistant Design of Structures, Part 1: General Provisions and Buildings, Fifth Revision (2002). A static, seismic base shear is calculated using the following general procedure and applied to top of the foundation.
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Calculate Zone factor Z on the basis of 6.4.2 & Annex E or the mapped value.
This can be directly specified or selected from a list of Indian cities.
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Calculate Importance factor I on the basis of 6.4.2 & Table 6
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Calculate Response Reduction factor R on the basis of 6.4.2 & Table 7
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Calculate Sa/G from 6.4.2 & 6.4.5.
This can be directly specified or can be calculated by the program based on code parameters.
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Calculate Design Horizontal Seismic Coefficient Ah (Clause 6.4.2)
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Calculate of building weight, W.
Two conditions are considered by the program for each vessel: a) empty and b) operating. For vertical vessels,
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Calculate Design Seismic Base Shear Vb (Clause 7.5.3)
Base shears for vertical and horizontal vessels