排序方式: 共有47条查询结果,搜索用时 46 毫秒
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On the dimensioning of viscous dampers for the mitigation of the earthquake-induced effects in moment-resisting frame structures 总被引:1,自引:1,他引:0
Michele Palermo Saverio Muscio Stefano Silvestri Luca Landi Tomaso Trombetti 《Bulletin of Earthquake Engineering》2013,11(6):2429-2446
The effectiveness of viscous dampers in mitigating the seismic excitation impacts upon building structures has been widely proved. Recently, with reference to the specific case of equal mass, equal stiffness, shear-type structures, the authors developed a direct practical procedure which gives the mechanical characteristics of the manufactured viscous dampers capable of providing the frame structure with a prescribed value of the first damping ratio. In this paper, a comprehensive rational framework is presented, which allows to formally extend the validity of the proposed procedure to the more realistic case of a generic moment-resisting frame structure. Also the influence of various lateral stiffness distributions is investigated. 相似文献
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Jeroen Homan Rudy Wijnands Albert Kong Jon M. Miller Sabrina Rossi Tomaso Belloni Walter H. G. Lewin 《Monthly notices of the Royal Astronomical Society》2006,366(1):235-237
We report the result of an XMM–Newton observation of the black hole X-ray transient XTE J1650–500 in quiescence. The source was not detected, and we set upper limits on the 0.5–10 keV luminosity of 0.9–1.0 × 1031 erg s−1 (for a newly derived distance of 2.6 kpc). These limits are in line with the quiescent luminosities of black hole X-ray binaries with similar orbital periods (∼7–8 h). 相似文献
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Seismic Modal Contribution Factors 总被引:1,自引:0,他引:1
Michele Palermo Stefano Silvestri Giada Gasparini Tomaso Trombetti 《Bulletin of Earthquake Engineering》2015,13(10):2867-2891
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T. Belloni I. Parolin M. Del Santo J. Homan P. Casella R. P. Fender W. H. G. Lewin M. Méndez J. M. Miller M. van der Klis 《Monthly notices of the Royal Astronomical Society》2006,367(3):1113-1120
On 2004 August 15, we observed a fast (shorter than 10 h) state transition in the bright black hole transient GX 339–4 simultaneously with Rossi X-Ray Timing Explorer ( RXTE ) and INTEGRAL . This transition was evident both in timing and spectral properties. Combining the data from the Proportional Counter Array (PCA), the High-Energy X-ray Timing Experiment (HEXTE) and the Imager on Board the INTEGRAL Satellite (IBIS), we obtained good quality broad-band (3–200 keV) energy spectra before and after the transition. These spectra indicate that the hard component steepened. Also, the high-energy cut-off that was present at ∼70 keV before the transition was not detected after the transition. This is the first time that an accurate determination of the broad-band spectrum across such a transition has been measured on a short time-scale. It shows that, although some spectral parameters do not change abruptly through the transition, the high-energy cut-off increases/disappears rather fast. These results constitute a benchmark on which to test theoretical models for the production of the hard component in these systems. 相似文献