Evaluation of Parameters Affecting the Inelastic Acceleration Ratio

emad Elhout

doi:10.56748/ejse.24712

Authors

emad Elhout Pharos University in Alexandria https://orcid.org/0000-0001-8332-7874

DOI:

https://doi.org/10.56748/ejse.24712

Keywords:

The Inelastic Acceleration Ratio, Damping ratio, Post-yield stiffness ratio, Vibration period, Ductility ratio , Inelastic displacement ratio, Inelastic velocity ratio

Abstract

The Inelastic Acceleration Ratio (IAR) is a helpful instrument for determining the maximum inelastic acceleration from the related elastic acceleration that seems to have been little examined in past research. The IARs using single-degree-of-freedom (SDOF) systems with various structural factors under thirty pairs of ground motion earthquakes recorded are investigated in this paper. The linear elastic-perfect plastic model is used to model SDOF systems. The factors to consider include elastic vibration period (T), displacement ductility ratios (μ, 2-8), the post-yield stiffness ratio (α, 0-15%), and the damping ratio (x, 3-20%). The results showed that the IAR values are decreased with an increase in the ductility ratios (μ) while the IAR values are increased with an increase in the damping ratios (x). While the post-yield stiffness ratio (α) has little effect on the IAR. Also, Analytical formulae are used to estimate IAR based on the T, μ, α, and x.

Downloads

References

BÖREKÇİ, M., and AYDOĞAN, B. “Prediction of inelastic displacement ratios for evaluation of degrading SDOF systems: A comparison of the scaled conjugate gradient and Bayesian regularized artificial neural network modeling”, Sigma Journal of Engineering and Natural Sciences, Vol. 42(1), 2024, pp 211-224.

Chikh, B., Ahmed, M., Nacer, L., Moussa, L., Youcef, M., Mohamed, H., Abderrahmane, K., Djilali, B. “Seismic structural demands and inelastic deformation ratios: a theoretical approach”, Earthquakes and Structures, Vol.12 (4), 2017, pp 397-407.

COSMOS, The Consortium of Organizations for Strong-Motion Observation Systems, 2017. http:// www.cosmos-eq.org/

De Francesco, G. “Constant-ductility inelastic displacement ratios for displacement-based seismic design of self-centering structures”, Earthquake Engineering Structure Dynamic, Vol. 48, 2019, pp188–209.

Dong, H., Han, Q., Du, X., Liu, J. “Constant ductility inelastic displacement ratios for the design of self-centering structures with flag-shaped models subjected to pulse-type ground motions”, Soil Dynamics and Earthquake Engineering, Vol. 133, 2020, pp 106143.

Federal Emergency Management Agency- FEMA450, NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures, Part 1: Provisions and Part 2: Commentary, Washington D.C, 2023.

Garakaninezhad A., Amiri, S. “Inelastic acceleration ratio of structures under pulse-like earthquake ground motions”, In Structures, Vol. 44, 2022, pp 1799-1810.

Hatzigeorgiou, G.D., Papagiannopoulos, G.A. “Inelastic velocity ratio”, Earthquake Eng Struct Dyn, Vol. 41, 2012, pp 25–41.

Hatzigeorgiou, G.D., Beskos, D.E. “Inelastic displacement ratios for SDOF structures subjected to repeated earthquakes”, Engineering Structures, Vol. 31(11), 2009, pp 2744–55.

Hatzigeorgiou, G.D., Pnevmatikos, N.G. (2014) Maximum damping forces for structures with viscous dampers under near-source earthquakes. Engineering Structure, Vol. 68, 2014, pp 1–13.

Kam, W.Y., Pampanin, S., Palermo, A., Carr, A.J. “Self-centering structural systems with combination of hysteretic and viscous energy dissipations”, Earthquake Engineering and Structural Dynamics, Vol.39 (10), 2010, pp 1083–1108.

Konstandakopoulou, F., Hatzigeorgiou, G. “Constant-ductility inelastic displacement, velocity and acceleration ratios for systems subjected to simple pulses”, Soil Dyn Earthquake Eng, Vol.131, 2020, pp 106027.

Obando, J.C., Lopez-Garcia, D. “Inelastic displacement ratios for nonstructural components subjected to floor accelerations” Journal of Earthquake Engineering, 2016, pp 1–26.

Pardalopoulos, S.I., Pantazopoulou, S.J. “Seismic response of nonstructural components attached on multistorey buildings”, Earthq Eng Struct Dyn, 2015, Vol. 44(1), pp 139–58.

Pisal, A.Y., and Jangid, R.S. “Dynamic response of structure with tuned mass friction damper”, Int J Adv Struct Eng, Vol. (8), 2016, pp 363–377.

Ruiz-García, J. “Inelastic displacement ratios for seismic assessment of structures subjected to forward-directivity near-fault ground motions”, Journal of Earthquake Engineering, 2011, Vol. 5, pp 449–68.

SeismoSignal, version 4.3.0, Pavia, Italy: Seismosoft Ltd. Retrieved from http://www.seismosoft.com/en/HomePage.aspx

Soni, D.P., Mistry, B.B., Jangid, R.S., and Pancha, V.R. “Seismic response of the double variable frequency pendulum isolator”, Structural Control and Health Monitoring, Vol. (18), 2011, pp 450–470.

Yaghmaei-Sabeghو S., Daneshgari, S., Neekmanesh, S. “Inelastic displacement ratio for high damping SDOF systems built on soft soil sites”, Soil Dynamics, and Earthquake Engineering, Vol. 135, 2020, pp 106203.