Navigation: Design Spectra >

Code Design Spectrum

Name / Damping Ratio

Set the desirable name for the code design spectrum and specify the damping ratio.

Site

Set the defined site. A "None" site option is also available in which the user can define the required spectral parameters, and QuakeManager will calculate and develop the spectrum depending on the selected design code.

Design Code

Select one of the supported design codes:

•ASCE 7-22

•ASCE 7-16

•ASCE 7-10

•ASCE 41-17

•ASCE 41-13

•NEHRP 2020

•NEHRP 2015

•NEHRP 2009

•IBC 2015

•IBC 2012

•CBC 2019

•CBC 2016

•CBC 2010

•AASHTO 2009

Override Soil Class

QuakeManager identifies the soil class from the site dialog in case the user selected a defined site. However, in case the soil class needs to be changed without referring to the site dialog, the user may click on the Override Soil Class box and choose the desirable soil class. Note that the Override Soil Class option is not supported with “None” site. With “None” site, the user selects the appropriate soil class for the spectrum development.

Spectrum

Set the appropriate seismic shaking level as Maximum Considered Earthquake (MCE) / Design Basis Earthquake (DBE) Horizontal or Vertical spectrum. The seismic level differs depending on the selected Design Code.

For ASCE 7-22 and NEHRP 2020, the supported spectra are:

MCE Multi-Period Horizontal

MCE Two-Period Horizontal

MCE Multi-Period Vertical

DBE Multi-Period Horizontal

DBE Two-Period Horizontal

DBE Multi-Period Vertical

 

For ASCE 7-16 and NEHRP 2015, the supported spectra are:

MCE Horizontal

MCE Vertical

DBE Horizontal

DBE Vertical

For ASCE 7-10, NEHRP 2009, IBC 2012, IBC 2015, CBC 2019, CBC 2016 and CBC 2010, the supported spectra are:

MCE Horizontal

DBE Horizontal

For ASCE 41-17 and ASCE 41-13, the supported spectra are:

BSE-2N Horizontal

BSE-1N Horizontal

BSE-2E Horizontal

BSE-1E Horizontal

Custom Probability Horizontal

BSE-2N Vertical

BSE-1N Vertical

BSE-2E Vertical

BSE-1E Vertical

Custom Probability Vertical

Risk Category / 50-Yr (%)

Risk category: a classification of building and other structures depending on risk associated due to damage or failure. Risk category may be set depending on the building use or occupancy and using the risk category along with SDS and SD1, the seismic design category may be identified. Risk category definition is mandatory with all design codes except ASCE 41 and AASHTO 2009. Risk Category options are:

•Risk Category I

•Risk Category II

•Risk Category III

•Risk Category IV

50-Yr (%): Activated in case ASCE 41 design code and Custom Probability Seismic Level are selected. It represents target custom probability of exceedance in a 50-year return period. Acceptable range is: 0.00016-0.9.

Import from USGS

Return spectral parameters and data from USGS web services.

Scale Factor

Scale the whole spectrum by a user-defined factor. By default, the scale factor is set to 1. 

LogSigma

Define the value of the spectrum dispersion.

View Hazard Parameters

Check Additional Hazard Parameters.

Period to Use

NGA: Use the 111 NGA periods. For intermediate periods not returned by USGS web services, QuakeManager will interpolate the spectral values.

USGS: Use the same periods returned by USGS.

Damping Ratio

Set the desirable damping ratio.