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Seismic Analysis: Calculation of Base Shear, Study notes of Reinforced Concrete Design
A step-by-step calculation of base shear in seismic analysis, following the guidelines of the national structural code of the philippines (nscp) 2015. It demonstrates the application of various factors and coefficients, including seismic zone factor, near source factors, and response modification factor, to determine the base shear value. A practical example of how to calculate base shear for a specific structure.
Typology: Study notes
2020/2021
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Na = 1. Nv = 1.
SEISMIC ANALYSIS
ACTIVE SEISMIC FAULT LOCATION:
Assumed distance = greater than 15km from the known active fault Seismic Zone Factor (Zone 4): >10km Z = 0.40 (NSCP 2015 Table 208-3) Near Source Factors: Na = 1.0 (NSCP 2015 Table 208-5) Nv = 1.0 (NSCP 2015 Table 208-6) Seismic Response Coefficient: Ca = 0.44Na = 0.44(1.0) = 0.44 (NSCP 2015 Table 208- 7)
Cv = 0.96Nv = 0.96(1.0) = 0.96 (NSCP 2015 Table 208- 8) Response Modification Factor: R = 8.5 Kn R = 8.5 , for Concrete SMRF (NSCP 2015 Table 208-11A)
HORIZONTAL BASE SHEAR, V: W = 250 kN ( total seismic weight based on tributary area ) V = (Cv I W) / R T (NSCP 2015 ; 208-8) V = 1.536 (1.0) (150) / 8.5 (0.46244) = 58.61 kN Base Shear Need Not to Exceed, V = (2.5Ca I W) / R (NSCP 2015 ; 208-9) V = 2.5(0.528)(1.0)(150) / 8.5 = 23.29 kN Base Shear Shall Not be Less Than, V = (0.1Ca I W) (NSCP 2015 ; 208-10) V = 0.1 (0.528) (1.0) (150) = 7.92 kN Base Shear Shall Not be Less Than,V = (0.8 Z Nv I W) /R (NSCP 2015 ; 208-11) V = 0.8 (0.40) (1.6) (1.0) (150) / 8.5 = 9.04 kN Therefore use, V= 23.29 kN