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Element Test using D_MOD2 PEER 2G02. By Dr. Neven Matasovic.
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Element Test using D_MOD2PEER 2G02 By Dr. Neven Matasovic
I completed my analysis for the PEER 2G02 second assignment. As you know, input in D-MOD is an acceleration time history. D-MOD can not accept shear strain (or stress) as an input and it does not allow for specification of initial static shear stress (strain). The only way to check what D-MOD does in terms of stress-strain behavior is to excite one element by a series of acceleration time histories (as you provided in terms of shear strain time histories). Therefore, I: • 1. converted the shear strain time histories you provided into the acceleration time histories. I did that by arbitrarily assigning time step of 0.02 seconds and peak amplitude of approximately 0.9 g to each shear strain time history you provided; and • 2. arbitrarily assigned a small amount of viscous damping (approximately 0.4%); mass and stiffness to a single element and applied the above described, converted time histories to a (compliant) base of the model. • 3. run the analysis using the modified MKZ model and monitored the results in terms of shear stress and shear strain time histories. Please note that, in fact, I did a non-linear single-degree-of-freedom system analysis. The results of my evaluation follow plots of acceleration time histories used in the analyses. Please also note that I was able to analyze only “spreadsheet” steps 1 and 3 as D-MOD does not allow for specification of initial static shear stress (strain). The results of my evaluations show that stress-strain model embedded in D-MOD strictly follows the Masing rules. As always, the D-MOD input/output files and related spreadsheets are available. Please let me know if you require them,or anything else related to this exercise. Sincerely, Neven Matasovic
