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Earthqauke Load Analysis (NSCP 2015) Static Force Procedure

This document provides guidelines for determining base shear and distributing seismic forces along the height of a structure according to the National Structural Code of the Philippines (NSCP) 2015. It outlines the static force procedure which uses factors like seismic zone, structural period, and dead weight to calculate minimum base shear. Tables provide seismic coefficients corresponding to zone, period, and soil conditions. Two example problems demonstrate applying the process to specific building designs and sites.

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Muayad Alzbedi
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627 views4 pages

Earthqauke Load Analysis (NSCP 2015) Static Force Procedure

This document provides guidelines for determining base shear and distributing seismic forces along the height of a structure according to the National Structural Code of the Philippines (NSCP) 2015. It outlines the static force procedure which uses factors like seismic zone, structural period, and dead weight to calculate minimum base shear. Tables provide seismic coefficients corresponding to zone, period, and soil conditions. Two example problems demonstrate applying the process to specific building designs and sites.

Uploaded by

Muayad Alzbedi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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EARTHQAUKE LOAD ANALYSIS (NSCP 2015)

STATIC FORCE PROCEDURE

Determination of Base Shear, V


CV IW 2.5Ca IW
V= ≤
RT R
V ≥ 0.11Ca IW
0.8ZNV IW
V= ∗∗∗ In addition for seismic zone 4.
R
Where:
V is the base shear
Na is the seismic coefficient (Table 208-5)
Nv is the seismic coefficient (Table 208-6)
Ca is the seismic coefficient (Table 208-7)
Cv is the seismic coefficient (Table 208-8)
T is the period of vibration
R numerical coefficient
W is the total dead weight of the structure
I is the importance factor

Table 208-3 Seismic Zone Factor Z


ZONE 2 4
Z 0.20 0.40
STRUCTURE PERIOD
ILLUSTRATIVE PROBLEMS:
1. Given a commercial building designed under special moment resisting frame has the following weights as shown in the
figure. Site location is in Baguio City in which it is within 10 km from Tebbo Fault. Calculate the design Base Shear and
distribute over the height of the structure.

Assume seismic source Type A.

2. Given Parameters:
Site Location: Baguio City
Occupancy: Educational Building w/ a capacity of 300 or more occupants
Structural System: Reinforced Concrete Moment Frames
Distance to Seismic Source: 9 km
Seismic Source Type: A
Soil profile: SD
Required:
Determine the Base Shear as prescribed by the static procedure from the NSCP 2015.
Vertical Storey Distribution of the Base Shear.

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