Seismic Resilience Upgrade of RC Frame Building Using Self-Centering Concrete Walls with Distributed Friction Devices

Guo, Tong; Xu, Zhenkuan; Song, Lei; Wang, Lei; Zhang, Zhiqiang

doi:10.1061/(asce)st.1943-541x.0001901

Cited by 61 publications

(14 citation statements)

References 20 publications

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“…where , is as defined in Equation (19) for the th SC-CBF in the building; describes the angle of the th SC-CBF relative to the global -axis as shown in Figure 4D, and , and , are the distance between the centroid of the th SC-CBF to the center of mass in the and directions, respectively. The global compatibility matrix could be assembled using the local compatibility matrix of each SC-CBF.…”

Section: Extension To 3dmentioning

confidence: 99%

“…Often, mild steel is used for this purpose 6,7 ; however, other forms of energy dissipation could be applied such as viscous fluid dampers 8,9 or energy dissipation fuses. 10 It has been shown both experimentally, 6,9,[11][12][13][14][15][16][17] and analytically, 18,19 that rocking systems can withstand large deformations with negligible damage while preserving the self-centering capability. In addition, these systems significantly reduce the downtime of the building, which can be very important after a major seismic event.…”

Section: Introductionmentioning

confidence: 99%

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Mixed Lagrangian formalism for dynamic analysis of self‐centering systems

Marzok

Lavan

2020

Earthq Engng Struct Dyn

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This paper presents two models for the analysis of self‐centering concentrically braced frames (SC‐CBFs) with multiple rocking sections. Both models are developed within the mixed Lagrangian formalism (MLF). For these models, MLF leads to a quadratic optimization problem at each time step where the internal forces at the end of the time step are the design variables. The first model is more general and explicitly models the truss elements. The second model is simplified and utilizes a macromodel. This model is easier to implement for initial designs, optimization, and parametric studies. For the purpose of formulating the simplified model, a new rotational contact element is developed and added to the MLF to describe the behavior of the rocking sections. Both models are compared to results obtained using the finite‐element method. Although the comparison shows a good agreement, MLF is shown to allow much larger time increments for convergence. This considerably reduces the computational effort and central processing unit time. The simplified model is extended for three‐dimensional analysis of SC‐CBFs. This shows that the proposed models can be easily extended using relatively simple transformation matrices.

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Section: Extension To 3dmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mixed Lagrangian formalism for dynamic analysis of self‐centering systems

Marzok

Lavan

2020

Earthq Engng Struct Dyn

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“…A common solution is to introduce self‐centering systems into existing RCFs by attaching unbonded prestressed tendons. Guo et al and Song et al proposed a self‐centering concrete frame/wall with web friction devices and applied this structure into the seismic resilience upgrade of a five‐story building. The external system not only significantly improved the deformation capacity but also reduced the residual drift.…”

Section: Introductionmentioning

confidence: 99%

Research on the seismic retrofitting performance of RC frames using SC‐PBSPC BRBF substructures

Cao

Feng

et al. 2020

Earthq Engng Struct Dyn

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A new type of external substructure to upgrade existing reinforced concrete frames (RCFs) is presented in this paper, namely, a self-centering precast bolt-connected steel-plate reinforced concrete buckling-restrained brace frame (SC-PBSPC BRBF). The upgrade mechanism and three-dimensional simulation model were analyzed based on relevant experiment validations. A quasistatic analysis and parameter study was conducted using 21 scenarios to compare the upgrading effects of the outside substructure. Afterwards, a stiffness-based design procedure was developed and modified for this external substructure, including macro-demand analysis, partial component design, and overall structural evaluations. Dynamic analyses were also performed on a frame building for five cases, before and after strengthening. The proposed numerical model reflected the precast characteristics and displayed the ideal fitting accuracy.The external assembled brace provided sufficient initial stiffness and energy dissipation capacity, while the external prestressed tendon decreased residual displacements and facilitated self-centering of the whole structure. The analyses illustrated that the damage to the existing RCF was transferred and seismic demands were significantly reduced within limitations, accompanied with greater capacity reliability. This research provides a reference for the practical applications of the external upgrading substructures in earthquake-prone areas.

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“…Friction-based passive energy dissipation devices have been successfully used in practice to enhance seismic performance of both newly designed and existing structures subjected to strong earthquake excitations [Vezina and Pall, 2004;Pasquin et al, 2004;Shiraia et al 2019]. Different types of friction-based dampers have been developed recently including friction wall dampers [Nabid et al 2017], rotational friction dampers [Mualla and Belev, 2017], friction braced frames [Tirca et al, 2018], and posttensioned concrete walls with friction devices [Guo et al, 2017]. However, finding the optimum values of slip loads in the friction devices (the loads at which the friction devices start slipping and hence dissipating energy) is challenging, since these values can be sensitive to the characteristics of the seismic excitation.…”

Section: Introductionmentioning

confidence: 99%

Simplified Method for Optimal Design of Friction Damper Slip Loads by Considering Near-Field and Far-Field Ground Motions

Nabid

Hajirasouliha

Petkovski

2019

Journal of Earthquake Engineering

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A simplified method is proposed for optimum design of friction dampers by considering the characteristics of design earthquakes. Optimum slip loads for 3, 5, 10, 15 and 20-storey RC frames with friction wall-dampers are obtained for a set of 20 near and far-field earthquakes as well as artificial spectrum-compatible records scaled to different acceleration levels. Optimum solutions are shown to be more sensitive to Peak Ground Velocity (PGV) than Peak Ground Acceleration (PGA), especially for near-field earthquakes with high velocity pulses. For identical PGA levels, far-field earthquakes on average result in 1.5 times lower optimum slip loads compared to near-field records, while they lead to 118% higher energy dissipation and 24% lower maximum inter-storey drifts. Empirical equations are proposed to predict optimum slip loads (as a function of number of storeys and PGA/PGV of design earthquakes) and their efficiency is demonstrated through selected examples.

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Seismic Resilience Upgrade of RC Frame Building Using Self-Centering Concrete Walls with Distributed Friction Devices

Cited by 61 publications

References 20 publications

Mixed Lagrangian formalism for dynamic analysis of self‐centering systems

Mixed Lagrangian formalism for dynamic analysis of self‐centering systems

Research on the seismic retrofitting performance of RC frames using SC‐PBSPC BRBF substructures

Simplified Method for Optimal Design of Friction Damper Slip Loads by Considering Near-Field and Far-Field Ground Motions

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