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Seismic Spectrum Calculator to EC8

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

List of parameters used in this calculator

Technical notes

Inputs

General

Elastic Spectrum

Design Spectrum

Base Shear

Output

Base Shear

Horizontal Seismic Response Spectra




Explanation

Why 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 Equations

Below 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



Acknowledgements

This calculation was built in collaboration with Hakan Keskin Learn more.

Related Resources

  1. Design Guide: Steel Bracing Systems
  2. Eurocode calculators