Response spectrum definition

 

 

The response spectrum definition (~DEFSPEC command) depends on the selected seismic code.  Through the main menu:

 

Main Menu ® Seismic Design ® Define Spectrum

 

a window similar to the ones shown hereafter is opened. The labels, boxes and values inside the window depend on the selected code.

 

 

Some of the values can be defined from the location of the structure (ground acceleration, for example). To do this the Location button can be pressed, and a utility to obtain the values of the code depending on the location will be shown (this utility is not available for all codes):

 

 

or the Map button, which will show a map over which the location of the structure can be selected by clicking on it.

 

 

The window opened through the Map button contains a series of tabs in which the maps provided by the selected code can be seen, normally limited to the geographic application area of the code, or a series of maps published by the Global Seismic Assessment Program of the U.S. Geological Survey (GSAP) which provide the ground acceleration, classified in the following zones:

 

• Africa
• Asia
• Europe
• North Europe
• EuroAsia
• North America
• South America
• South America (Andean Region)
• Pacific (Pacific Ocean/Oceania)
• Pannonian region
• West Mediterranean region

 

Whit Spectrums defined, at least 1, at much 4, it can be listed spectrum, List spectrum, or viewed the different spectrums, Plot spectrum:

 

 

 

Which allows to choose initial time (T1), end time, (T2), and and if you want to see the spectrum horizontal or vertical. Pressing OK it will be opened the follow window:

 

 

 

 

 

Whit the following options:

 

• Combo value is the damping selected, expressed in %.
• Grid will display the button or not the grid in the chart.
• The checkbox will select that graphic below, within the selected spectrum, we would like to view.

 

 

Related commands:

~DEFSPEC