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The objective of Example 1a and Example 1b is to give an overview of input-file format in OpenSees using simple scripts. These scripts do not take advantage of the Tcl scripting capabilities shown in the later examples. However, they do provide starting a place where the input file is similar to that of more familiar Finite-Element Analysis software. Subsequent examples should be used as the basis for user input files.
Example 1 is a 2D elastic cantilever column, Example 1b is a 2D elastic portal frame. Each example has two independent input files, one for each type of analysis:
a. Static Pushover |
b. Dynamic Earthquake Ground Motion |
Each example script does the following:
1. Build the model |
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model dimensions and degrees-of-freedom nodal coordinates nodal constraints -- boundary conditions nodal masses elements and element connectivity recorders for output |
2. Define & apply gravity load |
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nodal or element load static-analysis parameters (tolerances & load increments) analyze hold gravity loads constant reset time to zero |
3. Define and apply lateral load |
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load pattern (nodal loads for static analysis, support ground motion for earthquake) lateral-analysis parameters (tolerances & displacement/time increments) damping for dynamic analysis analyze |
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