Rocking Response Analysis of Self-Centering Walls under Ground Excitations

Abstract

This paper presents a numerical procedure to simulate the rocking response of self-centering walls under ground excitations. To this aim, the equations of motion that govern the dynamic response of self-centering walls are first formulated and then solved numerically, in which three different self-centering wall structural systems are considered, that is, (i) including the self-weight of the wall only, (ii) including posttensioned tendon, and (iii) including both posttensioned tendon and dampers. Following the development of the numerical procedure, parametric studies are then carried out to investigate the influence of a variety of factors on the dynamic response of the self-centering wall under seismic excitations. The investigation results show that within the cases studied in this paper the installation of posttensioned tendon is capable of significantly enhancing the self-centering ability of the self-centering wall. In addition, increasing either the initial force or the elastic stiffness of the posttensioned tendon can reduce the dynamic response of the self-centering wall in terms of the rotation angle and angular velocity, whereas the former approach is found to be more effective than the latter one. It is also revealed that the addition of the dampers is able to improve the energy dissipation capacity of the self-centering wall. Furthermore, for the cases studied in this paper the yield strength of the dampers appears to have a more significant effect on the dynamic response of the self-centering wall than the elastic stiffness of the dampers.

Review on the rocking wall systems as a self-centering mechanism and its interaction with floor diaphragm in precast concrete structures

“…However, this approach is not preferred as it mainly involves mathematical formulations. Hu et al (2018) and Kalliontzis et al (2020) are among the researchers who utilize the numerical analysis approach in their works. Together, some design guidelines, procedures, verification and validation document have been published by researchers on the rocking wall system.…”

Seismic performance evaluation of steel moment resisting frames with mid-span rigid rocking cores

“…The analysis results showed high ductility and effectiveness of this seismic-resistant system. Hu et al [18] examined the effect of various factors such as changing the initial force or the elastic stiffness of post-tensioned tendon on the dynamic response of self-centering walls. In 2019, Lin et al [19] introduced the curved-base rocking walls and explored the advantages of this geometric modification on the behavior of timber buildings.…”

A Simplified Model for Dynamic Response Analysis of Framed Self‐Centering Wall Structures under Seismic Excitations

“…For the former one, the SC wall is treated as a rigid body, the PT tendon is represented by an elastic spring, and the dampers are simulated by elastoplastic springs [2]. Using this model as well as referring to the work concerning rocking response analysis of the rigid block under ground motions [3][4][5][6][7], Hu et al [8] investigated rocking responses of the SC wall under seismic excitations. Differently, for the FE model, the wall is simulated by fiber beam-column elements [9,10] or diagonal struts [11,12], while the rocking behavior at the base is simulated by a group of contact springs.…”