Parametric study of seismic performance of structures with multiple rocking joints

Li, Tao; Berman, Jeffrey W.; Wiebe, Richard

doi:10.1016/j.engstruct.2017.05.030

Cited by 26 publications

(21 citation statements)

References 19 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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“…It has been shown that these forces can be significantly reduced when additional plastic hinges are designed at higher levels of the structural system. Similar designs were studied for rocking systems; in such systems, additional rocking sections are added at higher levels of the rocking wall or SC‐CBF 35, 36 . Parametric 36, 37 and experimental 38, 39 studies on these systems have shown that the moment and shear demands can be significantly reduced in the cases where higher vibration modes effect are dominant.…”

Section: Introductionmentioning

confidence: 99%

“…Several analytical models have been proposed for the analysis of systems in which rocking behavior is present 35, 36, 40–46 . These models have been generally established using the displacement‐based finite‐element method (FEM) formulation.…”

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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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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“…The new approach was inspired by recent innovations in RCMF design . Here, the issues are addressed through design led analysis (DLA) rather than prescriptive computations.…”

Section: Introductionmentioning

confidence: 99%

On repairable earthquake resisting archetypes with a view to resiliency objectives and assisted self‐centering

Grigorian¹,

Moghadam

Kamizi

2019

Structural Design Tall Build

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Performance-based seismic design, as an alternative to conventional methods of approach, has served engineers and the public rather well during the last two decades.Neither approach guaranties catastrophic collapse prevention nor post-earthquake realignment and repairs (PERR) due to major seismic events. As a result, most codecompliant buildings can be regarded as relatively safe but practically disposable. The paper presents a new philosophy that leads to sustainable design of new structures and the upgrading of existing earthquake resisting moment frames. Repairabilitybased design (RBD) relies on softening and control rather than strength and resistance to elevate seismic performance to economically viable, physical collapse prevention, damage control, and post-earthquake realignment and repairs. The new approach was inspired by design led analysis (DLA), performance control (PC), and recent developments in rocking core-moment frame design. DLA is a displacement based method of analysis with built-in results. PC is the ability to design a structure in such a way as to expect predetermined modes of response at certain stages of loading, extents of damage, and drift ratios. This paper advocates higher performance objectives than current codes of practice do. Several demonstrative examples have been provided.

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Parametric study of seismic performance of structures with multiple rocking joints

Cited by 26 publications

References 19 publications

On the analysis of multilevel rocking cores—A bioinspired analogy

On the analysis of multilevel rocking cores—A bioinspired analogy

Mixed Lagrangian formalism for dynamic analysis of self‐centering systems

On repairable earthquake resisting archetypes with a view to resiliency objectives and assisted self‐centering

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