Seismic Spectrum Calculator to EC8 - Lenny

This calculator allows the user to evaluate the impact of an earthquake on a structure, by generating the Elastic Response Spectrum, Design Spectrum and the resulting base shear (seismic force). 
All calculations are performed in accordance with EN 1998-1 2004 Eurocode 8: Design of structures for earthquake resistance - Part 1: General rules, seismic actions and rules for buildings. This code is typically referred to as "EC8". 
Calculation of EC8 List of parameters used in this calculator
Technical notes
InputsGeneral 
﻿﻿Spectrum Type
:Type 1​
﻿
﻿﻿Ground Type
:C​
﻿
﻿﻿Importance Class
:1​
﻿
﻿﻿agR
:0.06g​
﻿
Elastic Spectrum
﻿﻿ ξ
:1000%​
﻿
Design Spectrum
﻿﻿q
:5​
﻿
Base Shear
﻿﻿T1
:0.177sec​
﻿
﻿﻿m
:21000t​
﻿
﻿﻿Number of storeys of the building
:5​
﻿
OutputBase Shear 
Horizontal Seismic Response Spectra
﻿
﻿
ExplanationWhy are structures affected by earthquakes? 
How do we quantify the affect of an earthquake on a structure? 
What is a response spectrum?
EC8 Parameters and EquationsBelow are the equations as provided in EC8, that are used in this calculator.
Horizontal Elastic Response Spectrum
Horizontal Design Spectrum
Seismic Base Shear Force
Importance Factor
Behaviour Factor
﻿
AcknowledgementsThis calculation was built in collaboration with Hakan Keskin Learn more.
Related ResourcesDesign Guide: Steel Bracing Systems
Eurocode calculators
﻿