Seismic behavior improvement of reinforced concrete shear wall buildings using multiple rocking systems

Khanmohammadi, Mohammadreza; Heydari, Sajad

doi:10.1016/j.engstruct.2015.06.043

Cited by 55 publications

(14 citation statements)

References 31 publications

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“…19,20 Short to medium rise MLRCs composed of stiffened plywood panels and precast concrete segments have been successfully tested by different groups of researchers. The most important innovations in this field are because of Wiebe and Christopoulos, 21 Tao et al, 22 and Khanmohammadi and Heydari, 23 who have shown through extensive dynamic analysis, that inclusion of multiple pivots along the height of rocking systems can reduce the contributions of higher modes to the overall response of the structure and lower the elastic shear and moment demands on the intermediate levels. Properly designed rocking systems can prevent soft story failure, minimize P-delta effects, and redistribute Drift Shift (DS) along the height of the system.…”

Section: Rocking Core Technologymentioning

confidence: 99%

On the analysis of multilevel rocking cores—A bioinspired analogy

Grigorian¹,

Kamizi

2019

Engineering Reports

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This article presents a simple analogy, with practical applications, between the human spine and multilevel rocking cores (MLRCs) under similar loading conditions. The use of energy dissipating rocking cores in general and MLRCs in particular is a relatively new concept for reducing earthquake damage in new and existing buildings. The literature on the subject is rather scant. There are neither official guidelines nor educational materials for practical design of MLRCs. The first step toward rational design of MLRCs is to understand their elastic state static/dynamic behavior as part of a gravity and/or earthquake resisting system. The purpose of the current paper is not to reiterate the merits of various rocking systems but to provide reliable formulae for the preliminary design of simple MLRCs. Suffice to note that the multitude of gap movements in MLRCs results in increased damping and elongated periods of vibrations. Several parametric examples have been provided to demonstrate the applications, the validity, and the simplicity of the proposed solutions. All solutions are exact within the bounds of the theoretical assumptions. All results have been verified by independent computer analysis.

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Section: Rocking Core Technologymentioning

confidence: 99%

On the analysis of multilevel rocking cores—A bioinspired analogy

Grigorian¹,

Kamizi

2019

Engineering Reports

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“…The numerical studies show that the application of the multiple rocking walls (MRWs) reduces the higher mode effects in terms of shear and moment stories as compared to the base rocking walls. [ 31 ] However, only the structural behavior of MRWs has been investigated without providing further structural details. In addition, in most of the studies in this field, the behavior of MRWs has been evaluated in isolation, while wall–frame interaction can affect system responses.…”

Section: Introductionmentioning

confidence: 99%

A posttensioned rocking infill wall–frame system for multistory precast concrete buildings

Naserpour

Fathi

2021

Structural Design Tall Build

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Summary By proposing a multiple rocking infill wall–frame (MRWF) system, this paper investigates the effects of wall–frame interaction on the seismic response of self‐centering walls. In the MRWF system, infill walls are connected to the adjacent beams through posttensioned tendons, which provide the self‐centering ability, and the energy dissipation capacity of the system is enhanced using O‐shaped steel dampers. The seismic behavior of the MRWF system, with various wall configurations, is evaluated alongside conventional shear wall and typical rocking wall systems at three height levels of two, four, and six stories. After developing the numerical models, the cyclic and time history analyses are carried out. The results of cyclic analysis show that the energy dissipation capacity of MRWF models is much higher than that of typical rocking wall models. Furthermore, for the MRWF models, by increasing the number of walls with a smaller width, the effect of wall–frame interaction is mitigated, resulting in minimal damage to the structural members and self‐centering ability of more than 90%. The time history analysis results illustrate that for the MRWF models, the residual drifts and plastic rotation at the beams are significantly reduced by applying the proper structural layout of the multiple rocking walls, especially for six‐story models.

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“…As the above mentioned energy dissipation elements used in self‐centering RC wall systems are attached to the exterior of the wall or column, the concrete wall panels of self‐centering RC wall systems may still be easily damaged during the rocking of the wall 24 . Additionally, the installation of PT tendons and connectors in self‐centering wall systems is complicated; the restoring force provided by unbonded PT tendons may completely die out during cyclic loading, and self‐centering wall systems using unbonded PT tendons in high‐rise buildings are limited 25 .…”

Section: Introductionmentioning

confidence: 99%

Design and experimental verification of disc spring devices in self‐centering reinforced concrete shear walls

Xiao

2020

Struct Control Health Monit

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Summary This paper develops a disc spring (DS) device to improve the self‐centering capability of a conventional reinforced concrete (RC) shear wall. In particular, the DS devices are installed at the foot of the RC shear wall, thus forming a self‐centering RC shear wall (SCSW) system. The DS devices used in the SCSW system are expected to protect the RC wall from damage and provide restoring force for the system. The design method of the DS device is first presented, and mechanical equations are proposed to predict the loading force–displacement relationship of the DS device. A nonlinear regression method is also introduced to better describe the relationship between the friction force and torque for the DS device with friction materials. One friction device, four DS devices, and three SCSW specimens were finally designed and tested under cyclic loadings to investigate their hysteretic performances. The results demonstrate that the friction material exhibits stable and satisfactory energy dissipation, and all the designed DS devices exhibit good self‐centering capability and stable energy dissipation, which steadily increases with the increase of the friction force. The mechanical behaviors of the designed DS devices during loading stages are also effectively predicted by the proposed mechanical equations. Furthermore, the designed SCSWs with DS devices are demonstrated to exhibit desirable earthquake‐resilient performance.

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Seismic behavior improvement of reinforced concrete shear wall buildings using multiple rocking systems

Cited by 55 publications

References 31 publications

On the analysis of multilevel rocking cores—A bioinspired analogy

On the analysis of multilevel rocking cores—A bioinspired analogy

A posttensioned rocking infill wall–frame system for multistory precast concrete buildings

Design and experimental verification of disc spring devices in self‐centering reinforced concrete shear walls

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