Behavior factor of concrete portal frames with dissipative devices based on carbon-wrapped steel tubes

Pollini, A.; Buratti, Nicola; Mazzotti, Claudio

doi:10.1007/s10518-020-00977-y

Cited by 8 publications

(5 citation statements)

References 33 publications

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“…10, showing the variability of q for the seven accelerograms adopted, for each model. On average, the variability of q is consistent with the values observed for the precast buildings analyzed in Pollini et al [32].…”

Section: Behavior Factor Estimationsupporting

confidence: 89%

“…The dissipative fuse devices based on CWSTs [31,32] considered in the present paper have two main purposes: (i) to connect beam-column joints in order to prevent the possible unseating failure of beams, and (ii) to act as dissipative fuses, thus reducing the effects of seismic actions on structural elements. Specific studies in automotive engineering on structural crashworthiness [33,34] showed that metals, combined with composite materials in thin-walled circular tubes, have excellent capacities of energy absorption under axial compressive loads.…”

Section: Cwst Dissipative Devicesmentioning

confidence: 99%

“…In this context, the present paper refers to a low-damage solution for the retrofit of beamcolumn connections of existing precast RC structures, proposing the introduction of dissipative fuse devices based on Carbon-Wrapped Steel Tubes (CWST), introduced in Pollini et al [30,31]. Pollini et al [32] presented an analytical simplified approach to estimate an equivalent behavior factor to be used in design applications with these devices, validated by comparison with a large number of incremental dynamic analyses (IDAs).…”

Section: Introductionmentioning

confidence: 99%

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Seismic Retrofit of Existing Precast Rc Buildings With Dissipative Devices Based on Carbon Wrapped Steel Tubes

Praticò¹,

Pollini²,

Sonda³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The seismic vulnerability of existing precast RC buildings not designed against seismic actions is a well-known issue nowadays, as emerged from the aftermath of the seismic events that affected many productive areas in the Emilia region (north Italy) in 2012. This is a consequence of the lack of structural redundancy and the widespread adoption of friction-based connections, which can lead to collapses and significant damage to contents. Thus, the necessity of identifying suitable intervention strategies has been widely recognized by researchers, which proposed different retrofit techniques. One of the most diffused approaches is to introduce mechanical connectors between columns and roof elements, resulting in an increase of the base shear and the need to strengthen the columns. To prevent this phenomenon, dissipative devices based on Carbon-Wrapped Steel Tubes (CWST) are introduced herein for the retrofit of existing precast RC structures, aiming at reducing the forces transmitted to columns, and providing a suitable connection between columns and beams. To this regard, this paper discusses the seismic retrofit of an existing precast building equipped with CWSTs. Linear and non-linear time history analyses have been conducted on two different models of the structure, one with hinged beam-column connections, and on the one with CWSTs. The yielding and the ultimate rotations of the plastic hinges at the base of the columns as well as the cyclic shear resistance depending on the ductility demand on each element, are defined according to Eurocode 8 prescriptions. The paper discusses the effects of the introduction of the CWSTs in the connections in terms of forces and proposes equivalent behavior factor values for the two structures.

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Section: Behavior Factor Estimationsupporting

confidence: 89%

Section: Cwst Dissipative Devicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Seismic Retrofit of Existing Precast Rc Buildings With Dissipative Devices Based on Carbon Wrapped Steel Tubes

Praticò¹,

Pollini²,

Sonda³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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show abstract

“…For the last reason, a crescent-moon-shaped device has been selected (Palermo et al, 2015;Hsu and Halim, 2017). It is interesting to note that other types of devices have been recently applied at the beam-to-column joints, such as the friction devices reported in the FREEDAM project (Santos et al, 2019;Francavilla et al, 2020) and the carbon-wrapped steel tubes reported in Pollini et al (2020).…”

Section: Introductionmentioning

confidence: 99%

Crescent-Moon Beam-To-Column Connection for Precast Industrial Buildings

Bressanelli

Bosio

Belleri

et al. 2021

Front. Built Environ.

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The 2012 Emilia earthquakes caused significant damage to existing precast reinforced concrete (RC) industrial buildings not specifically designed to resist seismic actions. The main failure mechanisms were related to the loss of support of beams and roof elements caused by high relative displacements, to the failure of the mechanical connections and consequent fall of cladding panels, to the damage at the base of the columns and to the collapse of RC forks at the top of the columns. In all cases, the behavior of the connections, and specifically of beam-to-column connections, demonstrated to be crucial, given that they may inhibit the exploitation of strength and ductility reserves in precast elements. This paper presents a beam-to-column connection restraint-device for precast industrial buildings. The device can be applied to existing structures to transfer horizontal seismic forces between beams and columns and to increase the energy dissipation of the system. Design criteria were defined with the aim to limit the relative maximum displacement at the beam-to-column interface and to mitigate the out-of-plane overturning of the beam. Numerical analyses were carried out to define a suitable shape of the device and to investigate its effectiveness in terms of both local and global behavior. To validate the computational results, experimental tests have been also carried out. The tests allowed to classify the device as “dissipative” according to UNI EN 15129. Finally, the design procedure has been validated considering a one-story industrial building case study designed in accordance with the Italian building code.

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“…The seismic displacement demand of the considered building typology could be reduced by placing additional mechanical devices at the beam-to-column joint for both new and existing buildings (Martinez Rueda 2002;Martinelli and Mulas 2010;Plumier 2007;Belleri et al 2017b;Pollini et al 2020;Francavilla et al 2020;Bressanelli et al 2021). The provision of additional devices is compatible with the dry-assembly construction system, being the devices put in place at the end of the erection sequence.…”

Section: Introductionmentioning

confidence: 99%

Displacement-based design of precast hinged portal frames with additional dissipating devices at beam-to-column joints

Belleri

Labò

2021

Bull Earthquake Eng

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The seismic performance of precast portal frames typical of the industrial and commercial sector could be generally improved by providing additional mechanical devices at the beam-to-column joint. Such devices could provide an additional degree of fixity and energy dissipation in a joint generally characterized by a dry hinged connection, adopted to speed-up the construction phase. Another advantage of placing additional devices at the beam-to-column joint is the possibility to act as a fuse, concentrating the seismic damage on few sacrificial and replaceable elements. A procedure to design precast portal frames adopting additional devices is provided herein. The procedure moves from the Displacement-Based Design methodology proposed by M.J.N. Priestley, and it is applicable for both the design of new structures and the retrofit of existing ones. After the derivation of the required analytical formulations, the procedure is applied to select the additional devices for a new and an existing structural system. The validation through non-linear time history analyses allows to highlight the advantages and drawbacks of the considered devices and to prove the effectiveness of the proposed design procedure.

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Behavior factor of concrete portal frames with dissipative devices based on carbon-wrapped steel tubes

Cited by 8 publications

References 33 publications

Seismic Retrofit of Existing Precast Rc Buildings With Dissipative Devices Based on Carbon Wrapped Steel Tubes

Seismic Retrofit of Existing Precast Rc Buildings With Dissipative Devices Based on Carbon Wrapped Steel Tubes

Crescent-Moon Beam-To-Column Connection for Precast Industrial Buildings

Displacement-based design of precast hinged portal frames with additional dissipating devices at beam-to-column joints

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