The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON APPLIED AND THEORETICAL MECHANICS
Transactions ID Number: 88-298
Full Name: Ovidiu Prodan
Position: Ph.D. Candidate
Age: ON
Sex: Male
Address: Cluj – Napoca, str. G. Baritiu, no. 25
Country: ROMANIA
Tel:
Tel prefix:
Fax:
E-mail address: ovidiu.prodan@mecon.utcluj.ro
Other E-mails: pavel.alexa@mecon.utcluj.ro
Title of the Paper: Mitigation assessment of passive seismic protection
Authors as they appear in the Paper: Ioana Ladar, Ovidiu Prodan, Pavel Alexa
Email addresses of all the authors: ioana.ladar@mecon.utcluj.ro,ovidiu.prodan@mecon.utcluj.ro,pavel.alexa@mecon.utcluj.ro
Number of paper pages: 16
Abstract: The intended contribution proposes a versatile approach of assessing the efficiency of seismic mitigation of passive seismic protection – via supplemental damping - of steel multi storey type structures. The efficiency of seismic mitigation is expressed in terms of reduction in the amplitudes of kinematical parameters (top lateral displacements, in this case) associated to seismically induced vibratory motion of the analyzed structures. The proposed approach may be applied to other parameters (story drifts, induced velocities and accelerations, ductility coefficients) describing static and kinematical states of steel skeletal structures seismically acted upon. The proposed parameter for assessing efficiency of seismic protection is associated to the mitigation interval of steel frame type structures equipped with passive protection (viscous dampers). This interval is expressed in terms of both, time and fundamental natural period of vibrations of the structure and!
is considered from the moment when the vibratory motion is initiated till the moment the motion reaches its (approximate) steady state. During this time interval, a clear picture of vibratory motion is exhibited: length of the interval, number of vibratory cycles, amplitudes, their variation / decrease in time, the end of transitory motion and the beginning of the (short, nevertheless) induced pseudo - steady state motion. The intended contribution proposes a time variable parameter that synthesizes all these features of the transitory motion. The length of this interval is expressed in number of natural fundamental periods of vibrations and together with its descending slope emphasizes the effectiveness of seismic protection. The shorter is the interval and the greater is its descending slope, the more effective is the associated seismic protection. Time history type analysis have been carried out on several sets of skeletal steel structures. The structures are analyzed!
in two cases: without seismic protection (reference structure) and eq
uipped with passive seismic protection (viscous dampers). The numerical results of time history analysis refer to the variation of top lateral displacements ant the top lateral (induced) accelerations. The results are presented and discussed with reference to the proposed parameter assessing seismic mitigation. The time variation of the proposed parameter is presented graphically for a better and immediate "physical" perception. The effectiveness of the seismic passive protection is discussed in terms of proposed parameter.
Keywords: Steel skeletal structures, Viscous dampers, Time history analysis, Seismic mitigation curves
EXTENSION of the file: .doc
Special (Invited) Session: Mitigation assessment of passive seismic protection
Organizer of the Session: 646-290
How Did you learn about congress:
IP ADDRESS: 85.120.66.154
