Seismic-resistant self-centering rocking core system with buckling restrained columns

Blebo, Felix C.; Roke, David A.

doi:10.1016/j.engstruct.2018.06.117

Cited by 37 publications

(10 citation statements)

References 13 publications

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“…Nonlinear numerical analysis models of the test specimens were created using OpenSees, 32 as shown in Figure 11. The computational model was created to represent an ideal model neglecting factors such as deformation at the mechanical connections, and out‐of‐plane movements of spine frames.…”

Section: Nonlinear Numerical Analysis Of Test Specimensmentioning

confidence: 99%

“…Blebo, et al. adopted vertical post‐tensioning (PT) bars on the two sides of the spine frames 32 . However, this configuration might limit the installation space for elastic members such as PT bars or steel rods.…”

Section: Introductionmentioning

confidence: 99%

“…Blebo, et al adopted vertical post-tensioning (PT) bars on the two sides of the spine frames. 32 However, this configuration might limit the installation space for elastic members such as PT bars or steel rods. This study proposes an alternative configuration, where the elastic members are installed horizontally, so that installation of these elastic members could also be distributed along the height of the spine frames.…”

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confidence: 99%

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Super elastic system using parallel spine frames with steel braces

Chen

Tagawa

2020

Earthq Engng Struct Dyn

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To reduce the seismic response and residual deformation of structures, this study proposes a super elastic bracing system comprising parallel spine frames with steel rods acting as the braces connecting adjacent spine frames. The brace‐end connections are located on the outer side of the pin supports of spine frames to ensure that the axial deformation of the braces is lower than that of a regular bracing system with identical brace angles. To verify the feasibility and elastic range of the proposed system, cyclic loading tests were conducted using scaled specimens consisting of two spine frames with four different brace configurations. Numerical models created in OpenSees were used to simulate the loading tests appropriately. Four evaluation methods were developed for predicting the force and deformation relation considering the geometrical nonlinearity of the proposed system. Through parametric analyses, the influence of key parameters on structural behaviors is clarified, and the applicability of the evaluation methods is investigated.

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Section: Nonlinear Numerical Analysis Of Test Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Super elastic system using parallel spine frames with steel braces

Chen

Tagawa

2020

Earthq Engng Struct Dyn

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“…Wu and Lu [32] suggested light-weight energy-dissipation rocking core frame as a novel lateral load resisting system that has improved seismic performance in terms of low residual drifts due to utilizing self-centering energy-dissipation braces. Blebo and Roke proposed seismic-resistant self-centering rocking core system to provide considerable drift capacity while limiting residual drift and structural damage [33,34]. Grigorian and Griogorian [35] proposed structural design of rocking wall-frame which have uniform drift distribution and lead to prevention of soft story mechanism formation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Seismic Performance of Improved Rocking Concentrically Braced-frames with Zipper Columns

Sarand¹,

Jalali²

2020

Period. Polytech. Civil Eng.

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Concentrically braced frames (CBFs) as one of well-known stiff and common lateral force resisting systems often show limited ductility capacity under severe earthquakes. This study proposes rocking zipper braced frame (RZBF) to improve the drift capacity of CBFs which is based on combination of rocking behavior and zipper columns. In the RZBF system, rocking behavior permit the braced frame to uplift during the earthquake and then restoring force induced through post-tensioned bars self-center the frame to its initial state.Also, zipper columns can decrease the concentration of damage by distributing the unbalance force at the mid bay over the frame's height. To assess the performance of RZBF, a comparison study is carried out considering CBF, rocking concentrically braced frame, zipper braced frame and RZBF. For this purpose, some frames structures are designed and nonlinear time history analysis conduct under a set of earthquake records. Seismic responses such as roof drift ratio, gap opening at the column-base interface, forces of top story braces and post-tensioned bars are taken into consideration. The results show that the proposed RZBF has better performance among the others and zipper columns can improve the behavior of rocking systems.

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“…Later Wada et al [9,10] used rocking walls and steel dampers to retrofit an 11-story steel reinforced concrete frame in Japan. More recent rocking wall designs incorporated advanced dissipation mechanisms through the use of concentrically braced frames [11,12], buckling restrained frames [13], buckling-restrained braced frames [14] or restorative stabilizing restoring forces as in post-tensioned precast concrete walls [15][16][17] and moment resisting frame (SC-MRF) building with post-tensioned (PT) connections [18].…”

Section: Introductionmentioning

confidence: 99%

Modelling Radiation Damping in Rocking Wall Systems

Reza

Haikal²

2018

ACET

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In the growing concern of sustainable infrastructure, rocking wall systems have emerged as an economically viable solution to provide seismic resilience, particularly for the rehabilitation of existing structures. Rocking walls are stiff elements that can rotate freely, or rock, at their base, and constrain a structure to its first node of vibration under lateral loading. This prevents undesirable mechanisms such as soft story failure and activates plastic hinges in other parts of the structure, which ensures maximum energy dissipation and mitigates seismic structural damage. Although the performance of rocking wall systems has been studied in research and practice there are issues regarding their rocking motion, particularly in the presence of dissipation in the soil, otherwise referred to as radiation damping. Current practice for estimating radiation damping uses an equivalent damping ratio, originally developed for a rigid rocking block on rigid soil. In this study, we discuss some of the available approaches for modelling radiation damping and highlight the importance of modelling the effect of soil dissipation on wall behavior.

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Seismic-resistant self-centering rocking core system with buckling restrained columns

Cited by 37 publications

References 13 publications

Super elastic system using parallel spine frames with steel braces

Super elastic system using parallel spine frames with steel braces

Evaluation of Seismic Performance of Improved Rocking Concentrically Braced-frames with Zipper Columns

Modelling Radiation Damping in Rocking Wall Systems

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