Hi,
Briefly speaking:
1. Download EQ records for the hazard deaggregation values matching your site of interest.
2. Scale the EQ records to the desired seismic intensity levels
3. Define the loading pattern in OpenSees and load the scaled EQ records
You may find some more details here:
https://www.youtube.com/watch?v=dyOubm5CuXA
hi
Incremental Dynamic Analysis (IDA) is a technique to characterize the vulnerability of structures under seismic loads. It involves performing a sequence of nonlinear static (pushover) analyses with incrementally increasing intensities of ground motion.
You can implement IDA using OpenSEES (Open System for Earthquake Engineering Simulation) as follows:
Model the structure in OpenSEES. You'll need to define:
Nodes and elements representing the structural components
Properties (materials, sections, joints)
Constraints and boundary conditions
Define gravity loads to apply initially. This represents the self-weight of the structure.
Define load patterns to incrementally increase the intensity of the ground motion. You can define multiple load patterns with increasing scaling factors.
Define the ground motion record you want to use. You can import real acceleration time histories into OpenSEES.
Loop through the load patterns:
Apply the current load pattern, which scales the ground motion.
Perform a static pushover analysis with the load-controlled Newton method.
Record the maximum base shear and a response parameter (e.g. roof displacement)
Plot the results to generate the IDA curve, showing base shear vs roof displacement. This indicates how the structure responds to incrementally higher intensities of ground motion.
Perform further analyses at intensity levels of interest, to obtain results like time histories, drift profiles, member forces, etc.
Analyze the IDA curve to determine demand parameters like collapse intensity and displacement capacity.
Yousef Bahrambeigi Thank you for your replying, I want to perform incremantal dynamic analysis not static pushover analysis. The pushover analysis generates the capacity curves (base shear versus roof displacement) while the dynamic analysis gives the IDA curves (damage measure versus intensity measurement ).
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