Error in code-based NTC 2018 and Eurocode 8 spectrum

[MCortesc]

Good Morning,

For SeismoArtif 2020, I found an error when I try to create a design/inelastic spectrum using NTC18 Italian Code and EuroCode 8, Part 3. When I want to assign a behaviour factor (q), this value scales the all spectrum including the PGA (i.e. Sa (g) when the period is zero) which is conceptually wrong. To solve this I have to create by myself the spectrum using other routines and I cannot take advantage of the code-based spectrum tool you have, unless I use the elastic spectrum only.

I would appreciate if you solve this relevant issue.

Thank you in advance.

[seismosoft]

Indeed there is a bug in the expressions of the design spectrum of NTC-18.
We will have ti fixed in the next release of the programs.
Thank you for spotting it
Seismosoft Support