Seismic design and retrofit of frame structures with hysteretic dampers: a simplified displacement-based procedure

Nuzzo, Iolanda; Losanno, Daniele; Caterino, Nicola

doi:10.1007/s10518-019-00558-8

Cited by 50 publications

(39 citation statements)

References 22 publications

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“…The elastic stiffness k DB,i,j and the yield force F DB,i,j of the single j th dissipating brace at the i th story are defined starting from the equivalent dissipative bracing system as a function of the number of dissipative braces at the i th story n DB,i , as in the following Equations (10) (Nuzzo et al, 2019).…”

Section: (4)mentioning

confidence: 99%

“…The stiffness k D,i,j and the yield force F Di,j of the single hysteretic damper at the i th story are related to the stiffness k B,i,j of the elastic bracing rods and to the yield force F DB,i,j of the dissipative brace. Generally, the dissipative brace stiffness k DB,i,j can be determined as a series composition of rigid brace and damper (Equations 11) (Di Cesare and Nuzzo et al, 2019).…”

Section: (4)mentioning

confidence: 99%

“…Regarding the seismic design of buildings with dissipative bracing systems including hysteretic dampers, several studies have been based on the Displacement Based Design (DBD) procedure (Lin et al, 2003;Zahrai and Froozanfar, 2018;Mazza and Mazza, 2019;Nuzzo et al, 2019). The base concept of DBD, originally developed by Priestley et al (2007), consists in the approximation of a multi-degree of freedom (MDOF) structure in a single degree of freedom (SDOF) system with equivalent secant stiffness and viscous damping at the design displacement (Priestley, 2000;Priestley and Grant, 2005;Pei et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Seismic Design and Testing of Post-tensioned Timber Buildings With Dissipative Bracing Systems

Ponzo

Cesare

Lamarucciola

et al. 2019

Front. Built Environ.

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This paper describes a seismic design procedure for low-damage buildings composed by post-tensioned timber framed structures coupled with hysteretic dissipative bracing systems. The main goal of the design procedure is preventing or limiting earthquake-induced damage to the structural and non-structural elements. For this aim, a target design displacement is defined according to the desired performance level. Then, the corresponding design force, strength, and stiffness of the post-tensioning and of the dissipative braces are evaluated in order to size post-tensioned connections and dissipating devices. The results of shaking table testing performed at the University of Basilicata are also reported. A prototype model −2/3 scaled, three-dimensional, and three stories with a post-tensioned timber structure without and with V-inverted braces and U-shaped flexural steel dampers-has been extensively tested. During testing, the specimen was subjected to a set of seven earthquakes at different intensity levels of the peak ground acceleration. The effectiveness of the bracing system and the reliability of the proposed procedure are experimentally demonstrated. Non-linear dynamic analyses have been performed in order to simulate the experimental seismic response. The numerical model is based on a lumped plasticity approach, which combines the use of elastic elements with linear and rotational springs representing energy dissipating devices and plastic rotations of the connections. The numerical results accurately predict the non-linear behavior of the prototype model, obtaining a satisfactory matching with the target drift considered for design.

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Section: (4)mentioning

confidence: 99%

Section: (4)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seismic Design and Testing of Post-tensioned Timber Buildings With Dissipative Bracing Systems

Ponzo

Cesare

Lamarucciola

et al. 2019

Front. Built Environ.

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“…In other words, the structure has to be designed in such a way that, if the design earthquake occurs, the maximum losses admitted are the 15% of the total RPLV, with a probability of being overcome of 5%. In order to meet this requirement, the structural design at Life Safety (LS) performance level, in the respect of the Italian [17] seismic code, is realized through a displacement-based design approach [18], admitting a maximum interstorey drift (IDR) of 0.5%, thus limiting structural and non-structural damage. The building's occupancy is supposed to be commercial office, located in Norcia, central Italy, soil type B, topography class T2.…”

Section: Cost-based Design Framework Applied To a Rc Structure Equimentioning

confidence: 99%

Case-Study of a Cost-Based Seismic Design for a R.C. Frame With Additional Dissipative Brace Systems

Nuzzo¹

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The employment of cost-based design framework in seismic engineering is an important issue researchers are dealing with in last years. It mainly assumes loss indicators as design parameters, aiming to make a designer having greater consciousness about losses to expect due to seismic loads. In the state-of-art there are many proposals of loss-based seismic design methods. As well, it is possible to read about loss assessment analysis of several case-study systems. Although, very poor indications are provided about loss assessment of structural systems equipped with dissipative braces, that today represent a valid seismic design alternative. This work aims to present a case-study structure of a reinforced concrete building equipped with shear link dampers supported by a bracing system. The loss assessment analysis of the structure is realized through the use of PACT software (FEMA P58). The shear link's fragility curve is constructed starting from experimental test results, while the corresponding repair cost curve is generated through engineering judgment. Main loss results are commented and analyzed in the view of implementing a cost-based design framework.

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“…frame members by means of a combined plastic-damage hysteretic model (Mazza, 2019a). Nuzzo et al (2019) introduced a comprehensive displacement-based design approach with a direct reference to effective parameters of the damping braces in a way that is suitable for professional applications. However, non-linearity involved in the problem and the iterative nature of most of the mentioned procedures often make them articulated and lacking in promptness, and it is thus of little attraction for practitioners.…”

Section: Introductionmentioning

confidence: 99%

DIBRAST: A Computer-Aided Seismic Design Procedure for Frame Structures Equipped With Hysteretic Devices

Nuzzo

Ciliento

Caterino

2020

Front. Built Environ.

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This paper describes a comprehensive computer-aided seismic design approach for both new and existing frame structures equipped with hysteretic dampers. Despite continuous advancements in the state of the art demonstrating the effectiveness of these devices in mitigating seismic hazard, non-linearities involved in the problem and the articulated nature of most of the available design procedures often make them quite difficult to be implemented for real complex structures. To promote widespread use of hysteretic dampers, we present a thorough design approach that includes the application of a specific displacement-based design procedure by means of a computeraided support tool developed in a Visual Basic environment and named DIBRAST. The software is realized to drive the designer through the dissipative system's design. Required iterations are automated, thus significantly reducing the processing time. As its final output, it delivers the mechanical properties of the damping braces in order to meet a specific performance objective. In order to further support practitioners in the geometrical characterization of actual design dampers, authors developed an additional Visual Basic tool-the Shear Link Non-Linear Model-that is able to provide yielding force and elastic stiffness of a specific type of hysteretic device according to its geometry and material. In addition, geometric details of each device can be preliminary determined by means of newly proposed design charts, presented herein, that allow us to take into account the buckling issue too. Both developed tools are freely available online. A case study is provided to demonstrate the effectiveness of the proposed design approach and tools.

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Seismic design and retrofit of frame structures with hysteretic dampers: a simplified displacement-based procedure

Cited by 50 publications

References 22 publications

Seismic Design and Testing of Post-tensioned Timber Buildings With Dissipative Bracing Systems

Seismic Design and Testing of Post-tensioned Timber Buildings With Dissipative Bracing Systems

Case-Study of a Cost-Based Seismic Design for a R.C. Frame With Additional Dissipative Brace Systems

DIBRAST: A Computer-Aided Seismic Design Procedure for Frame Structures Equipped With Hysteretic Devices

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