Two-Period Design Response Spectrum to ASCE 7-22

Verified by the CalcTree engineering team on 23 September, 2024
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This calculator generates the Design Response Spectrum according to the ASCE 7-22 standard. The tool provides essential information for structural engineers to assess seismic demands and design structures to withstand earthquakes.
All calculations are performed in accordance with ASCE 7:2022 Chapter 11 - Seismic Design Criteria.
Calculation1. DefinitionsValues of mapped acceleration parameters and other seismic design parameters are provided at the U.S. Geological Survey (USGS) website.
1.1 Spectral response acceleration parameter 
﻿﻿S_MS
:0.408​
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Spectral response acceleration parameter at short periods adjusted for site effects.
USGS Seismic Design Geodatabase
﻿﻿S_M1
:0.137​
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Spectral response acceleration parameter at a  period of 1sec adjusted for site effects.
USGS Seismic Design Geodatabase
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1.2 Long-Period Transition Period
﻿﻿T_L
:12s​
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Long-Period Transition Period
 Figs, 22-14 to 22-17
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2. Results2.1 Spectrum
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﻿﻿Scale
:line​
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X-Axis Scale.
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2.2 Period
﻿﻿T_0
:0.09s​
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Basic Period 
Cl 11.4.5-2
﻿﻿T_S
:0.43s​
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Short Period
Cl 11.4.5-2
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2.3 Design Spec Response Acceleration 
﻿﻿S_DS
:0.272​
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Design Spec Resp Accel parameter at short periods
Eq. 11.4-1
﻿﻿S_D1
:0.117​
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Design Spec Resp Accel parameter at 1sec period
Eq. 11.4-2
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