Investigation of the Behavior of Self-Centering Base- and Double- Rocking Walls Subjected to Far-Field and Near-Field Earthquakes

مهندسی عمران فردوسی

Volume 34, Issue 1 - Serial Number 33, April 2021, Pages 53-76   

Document Type: Original Article

DOI: 10.22067/jfcei.2021.68094.1008

Authors

Esmaeil Mohammadi Dehcheshmeh¹; Vahid Broujerdian^{* 2}

¹, Iran University of Science and Technology, Tehran, Iran

²School of Civil Engineering,, Iran University of Science and Technology

Abstract

In the present study, the seismic behavior of self-centering rocking wall systems in both types of base-rocking and double-rocking was investigated. To conduct seismic analyses, three sets of seismic records were considered including 22 Far-Field (FF) ground motions and 28 Near-Field (NF) ground motions that half of which are Pulse-like (Pulse). These ground motions were used for nonlinear time-history analysis of structures with 8, 12, 16 and 20 floors. Based on the area of prestressing cables, three types of double-rocking walls are considered and compared with the base-rocking and the fixed base walls. Numerical modelling was conducted via OpenSEES software in two-dimensional space. For the sake of validation, the available experimental data of base rocking and fixed base walls was used. To compare the seismic performance of the structures, some desirability coefficients have been defined. These coefficients were based on the reduction of the higher mode effects and the reduction of the inter-story residual drifts. The results showed that generally, the double-rocking walls provides higher desirability coefficients than the other considered systems. Furthermore, the double-rocking walls by reducing the cable area in the bottom block (R2-H1) are more

Keywords

Self-Centering System; Rocking Wall; Residual Drift; Post-Tensioning; Higher Mode Effects

Supplementary Files

4-brojerdian-Revised.pdf

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