I understand that the peak load at that specific deformation is to be taken but how do we get the % in degradation (is it by % decrease from one load to another)? Additionally, do we compare peak loads from say 20mm deformation with peak loads from 30mm deformation or do we compared peak loads from 20mm, 1st cycle with degraded loads from the 2nd cycle of the same 20mm deformation. Attached is a visual of the hysteresis loop to show what i meant. Thanks in advance.
Dear S.M. Iqbal S.Z.A. ,
I would recommend going through chapter 2 of the following document. It provides a detailed explanation on cyclic stiffness and strength degradation.
Regards
Rohan
In this paper cyclic tests are classified in three groups in order to investigate the degradation characteristics of the selected RC specimens more specifically rather than considering the complete database with various material and geometrical parameters as well as different loading histories.
Please read my paper "Hysteresis Model for the Shear Behavior of the R/C Multistory Frame Buildings with Diaphragms under Seismic Actions (Part 1) - Principle of Formation" in SEISAN-KENKYU, Vol.42, No.12, 1990, 34-37 (696-699). You have to pay attention to the envelop curves and their characteristic points.
Unqualified comments :- Artifacts of graphical representation contain the answer.
Multitude of constant stiffness deformation alongside, sort of, vice-versa would suggest deriving conclusions from resilience envelope changes.
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