APEC SeismicPy

NSCP 2015 — Site Coefficients

Input Parameters

Distance to Seismic Source (km)

Seismic Source Type

Soil Profile Type

Seismic Zone

Results

Enter parameters and click Calculate.

NSCP 2015 — Response Spectrum

Input Parameters

C_a

C_v

Structural Period T (s) — for TH Reference

Max T/T_s (x-axis)

① Design Response Spectrum

② Time-History Reference (1.4× + period markers)

ADRS — Acceleration-Displacement Response Spectrum

Input Parameters

Site coefficients from NSCP 2015. Auto-filled when computed in the Site Coefficients tab.

C_a

C_v

Show radial period lines

Radial lines represent constant structural period T. Each line passes through the origin with slope 4π²/(g·T²). They help identify the effective period at any point on the ADRS curve.

ATC-40 Spectrum Reduction

Reduces the 5%-damped spectrum based on equivalent viscous damping from the structure's hysteretic energy dissipation (ATC-40 Chapter 8).

Structure Type

Type A: New buildings with stable, full hysteresis loops (e.g. ductile SMRF).
Type B: Average existing buildings with moderate energy dissipation.
Type C: Poor buildings with pinched or degrading hysteresis (e.g. unreinforced masonry).

Bilinear yield point — from the idealized pushover capacity curve.

d_y (m)

a_y (g)

Trial performance point — initial estimate where demand meets capacity. Uses T_i from initial stiffness to interpolate on the 5% ADRS.

d_pi (m)

a_pi (g)

ADRS Plot

Pushover Capacity Curve (ADRS Format)

Show on plot

Enter pushover curve data converted to spectral coordinates. S_d = spectral displacement (m), S_a = spectral acceleration (g). Data should start from origin and represent the capacity curve in ADRS format.

S_d (m)	S_a (g)
0	0
0.005	0.050
0.010	0.095
0.015	0.135
0.020	0.168
0.027	0.200
0.040	0.218
0.060	0.230
0.080	0.235
0.100	0.238
0.130	0.240
0.170	0.242
0.220	0.243
0.280	0.244
0.350	0.244

NSCP 2015 — Base Shear (Eq. 208-8 to 208-11)

Input Parameters

Seismic Zone

N_v

C_a

C_v

Importance Factor I

R — Response Modification

Period T (s)

Seismic Weight W (kN)

Results

Enter parameters and click Calculate.

NSCP 2015 — Structural Period Calculator

Input Parameters

Building Height, h_n (m)

Numerical Coefficient, C_t

Seismic Zone

Results

Enter parameters and click Calculate Period.

NSCP 2015 — Structural Redundancy (ρ)

Input Parameters

Structure Story Shear, V_struc (kN)

Element Story Shear, V_element (kN)

Floor Area, A_B (m²)

Structural System

Results

Enter parameters and click Calculate.

PGA — Fukushima-Tanaka Attenuation Model

Input Parameters

Earthquake Magnitude (M)

Distance to Source, R (km)

Soil Type

Results

Enter parameters and click Calculate PGA.

Scaling Base Shear Calculator

Input Parameters

Static Base Shear, V_static (kN)

Scale Factor

Response Spectrum Data (paste from Excel)

Direction	X (kN)	Y (kN)
MAJOR	106.27	4499.40
ORTHO	4299.50	85.74

Results

Enter parameters and click Calculate Scale Factors.

DPWH-BSDS — Design Response Spectrum

Input Parameters

PGA

S_s (Short Period)

S₁ (Long Period)

Site Class (Ground Type)

Damping Ratio (Level 1)

Max Period (s)

Include 2/3 Minimum

BSDS Level II — Design Response Spectrum

BSDS Level I — EGM Response Spectrum

Results

Enter parameters and click Generate Spectrum.

Seismic Story Shear Diagram

Input Data

Height (m)	Shear X (kN)	Shear Y (kN)
6.45	0	0
3.35	178.62	173.59
0	362.17	356.73

Story Shear Diagram

Seismic Overturning Moment Diagram

Input Data

Height (m)	Moment X (kN-m)	Moment Y (kN-m)
6.45	0	0
3.35	551.04	535.85
0	1749.66	1715.53

Overturning Moment Diagram

Story Displacement Plot

Story Definition

Story	Level (m)
Roof	5.36
2F	3.00
1F	0.00

Displacement Data (paste Max Disp & Avg Disp from spreadsheet)

Show

Max Disp (mm)	Avg Disp (mm)
0.0016	0.0003
0.0001	0.0000
0.0000	0.0000

Show

Max Disp (mm)	Avg Disp (mm)
0.0010	0.0002
0.0001	0.0000
0.0000	0.0000

Show

Max Disp (mm)	Avg Disp (mm)
0.0012	0.0002
0.0001	0.0000
0.0000	0.0000

Show

Max Disp (mm)	Avg Disp (mm)
0.0008	0.0001
0.0001	0.0000
0.0000	0.0000

Show

Max Disp (mm)	Avg Disp (mm)
0.0014	0.0003
0.0001	0.0000
0.0000	0.0000

Show

Max Disp (mm)	Avg Disp (mm)
0.0011	0.0002
0.0001	0.0000
0.0000	0.0000

Show

Max Disp (mm)	Avg Disp (mm)
0.0020	0.0004
0.0002	0.0000
0.0000	0.0000

Plot Options

Data Column

Show Mean

Show Envelope (Max)

Limit Line (vertical dash)

Highlight Load Case

Story Displacement Plot

Story Drift Plot

Story Definition

Story	Level (m)
Roof	5.36
2F	3.00
1F	0.00

Drift Data (paste Max Drift & Avg Drift from spreadsheet)

Show

Max Drift	Avg Drift
0.0010	0.0002
0.0005	0.0001
0.0000	0.0000

Show

Max Drift	Avg Drift
0.0008	0.0002
0.0004	0.0001
0.0000	0.0000

Show

Max Drift	Avg Drift
0.0009	0.0002
0.0004	0.0001
0.0000	0.0000

Show

Max Drift	Avg Drift
0.0006	0.0001
0.0003	0.0001
0.0000	0.0000

Show

Max Drift	Avg Drift
0.0011	0.0003
0.0005	0.0001
0.0000	0.0000

Show

Max Drift	Avg Drift
0.0007	0.0002
0.0004	0.0001
0.0000	0.0000

Show

Max Drift	Avg Drift
0.0013	0.0003
0.0006	0.0001
0.0000	0.0000

Plot Options

Data Column

Show Mean

Show Envelope (Max)

Limit Line (vertical dash)

Highlight Load Case

Story Drift Plot

Story Acceleration Plot

Story Definition

Story	Level (m)
Roof	5.36
2F	3.00
1F	0.00

Acceleration Data (paste Max Accel & Avg Accel from spreadsheet)

Show

Max Accel	Avg Accel
0.50	0.10
0.30	0.06
0.00	0.00

Show

Max Accel	Avg Accel
0.45	0.09
0.25	0.05
0.00	0.00

Show

Max Accel	Avg Accel
0.48	0.10
0.28	0.06
0.00	0.00

Show

Max Accel	Avg Accel
0.40	0.08
0.22	0.04
0.00	0.00

Show

Max Accel	Avg Accel
0.52	0.11
0.32	0.07
0.00	0.00

Show

Max Accel	Avg Accel
0.42	0.09
0.24	0.05
0.00	0.00

Show

Max Accel	Avg Accel
0.55	0.12
0.35	0.07
0.00	0.00

Plot Options

Data Column

Show Mean

Show Envelope (Max)

Limit Line (vertical dash)

Highlight Load Case

Story Acceleration Plot

ATC-40 Capacity Spectrum — Calculation Report