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RISS 인기검색어
- 검색키워드
- 저자 : Domizio (검색결과 4 건)
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Performance of TMDs on nonlinear structures subjected to near-fault earthquakes
Martín Domizio,Daniel Ambrosini,Oscar Curadelli 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.4
Tuned mass dampers (TMD) are devices employed in vibration control since the beginning of the twentieth century. However, their implementation for controlling the seismic response in civil structures is more recent. While the efficiency of TMD on structures under far-field earthquakes has been demonstrated, the convenience of its employment against near-fault earthquakes is still under discussion. In this context, the study of this type of device is raised, not as an alternative to the seismic isolation, which is clearly a better choice for new buildings, but rather as an improvement in the structural safety of existing buildings. Seismic records with an impulsive character have been registered in the vicinity of faults that cause seismic events. In this paper, the ability of TMD to control the response of structures that experience inelastic deformations and eventually reach collapse subject to the action of such earthquakes is studied. The results of a series of nonlinear dynamic analyses are presented. These analyses are performed on a numerical model of a structure under the action of near-fault earthquakes. The structure analyzed in this study is a steel frame which behaves as a single degree of freedom (SDOF) system. TMD with different mass values are added on the numerical model of the structure, and the TMD performance is evaluated by comparing the response of the structure with and without the control device.
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TMD effectiveness in nonlinear RC structures subjected to near fault earthquakes
Martin N. Domizio,Daniel Ambrosini,Oscar Curadelli 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.24 No.4
The use of Tuned mass dampers (TMD) has proved to be effective in reducing the effects of vibrations caused by wind loads and far-field seismic action. However, its effectiveness in controlling the dynamic response of structures under near-fault earthquakes is still under discussion. In this case, the uncertainty about the TMD performance arises from the short significant duration of near-fault ground motions. In this work, the TMD effectiveness for increasing the safety margin against collapse of structures subjected to near-fault earthquakes is investigated. In order to evaluate the TMD performance in the proposed scenario, the nonlinear dynamic response of two reinforced concrete (RC) frames was analyzed. TMDs with different mass values were added to these structures, and a set of near-fault records with frequency content close to the fundamental frequency of the structure was employed. Through a series of nonlinear dynamic analysis, the minimum amplitude of each seismic record that causes the structural collapse was found. By comparing this value, called collapse acceleration, for the case of the structures with and without TMD, the benefit produced by the addition of the control device was established.
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Raul Caruso,Marco Di Domizio 한국외국어대학교 국제지역연구센터 2013 International Area Studies Review Vol.16 No.3
Some researchers consider soccer matches as the stylization of a war in other battlefields. Such an approach has largely been used to interpret the violent phenomena related to the soccer environment, while less attention has been paid to the potential role of political and economic interactions between countries in determining the aggressive attitude of players on the pitch. In our paper we empirically investigate whether and how political hostility among countries reverberates on a soccer pitch by influencing players’ aggressiveness. The analysis focuses on official matches played by national teams in the final phases of the European and World Cup tournaments since 2000. We estimate a negative binomial regression including both political and sport variables, and we find that (a) commercial hostility, (b) the level of diplomatic relationships,(c) power asymmetry and (d) education gap between countries are positively and significantly associated with aggressiveness of the players on the pitch, approximated by the number of yellow and red cards. That is, briefly stated, international hostility reverberates onto the pitch. Moreover,sport covariates present the expected signs, namely, results show that the closeness of the teams,their ranking and the stage of the game (knockout stages with respect to the group phases) are also crucial in determining the cautions.
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Nonlinear dynamic analysis of a RC bridge subjected to seismic loading
Germán Nanclares,Daniel Ambrosini,Oscar Curadelli,Martín Domizio 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.26 No.6
Collapse of bridges in recent earthquakes demonstrates the need to deepen the understanding of the behaviour of these structures against seismic actions. This paper presents a highly detailed numerical model of an actual bridge subjected to extreme seismic action which results in its collapse. Normally, nonlinear numerical models have high difficulties to achieve convergence when reinforced concrete is intended to be represented. The main objective of this work is to determine the efficiency of different passive control strategies to prevent the structural collapse of an existing bridge. Metallic dampers and seismic isolation by decoupling the mass were evaluated. The response is evaluated not only in terms of reduction of displacements, but also in increasing of shear force and axial force in key elements, which can be a negative characteristic of the systems studied. It can be concluded that the use of a metallic damper significantly reduces the horizontal displacements and ensures the integrity of the structure from extreme seismic actions. Moreover, the isolation of the deck, which in principle seems to be the most effective solution to protect existing bridges, proves inadequate for the case analysed due to its dynamic characteristics and its particular geometry and an unpredictable type of axial pounding in the columns. This unexpected effect on the isolation system would have been impossible to identify with simplified models.
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