Results 161 to 170 of about 2,611 (203)

A note on seismic parametric excitation

Nuclear Engineering and Design, 1984
Abstract Directional components of seismic excitation may be interacting on a dynamical system to parametrically excite it. The response of a dynamical system subjected to both forced and parametric excitation may be obtained by augmenting the response to the forced excitation by an amplification factor.
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Response of tanks to vertical seismic excitations

Earthquake Engineering & Structural Dynamics, 1985
AbstractA method for analyzing the earthquake response of elastic, cylindrical liquid storage tanks under vertical excitations is presented. The method is based on superposition of the free axisymmetrical vibrational modes obtained numerically by the finite element method. The validity of these modes has been checked analytically and the formulation of
Medhat A. Haroun, Magdy A. Tayel
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Fiber Optic Seismic Excitation Modeling

22nd EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 2009
An experimental fiber optic seismic sensor and conventional point seismic sensors were deployed to monitor human generated signals in the US Southwest. Data from the two techniques were compared and the frequency domain results correlated well. Finite element modeling was performed to verify the results of the data collection.
S. McComas, M. McKenna, J. McKenna, K. Koppenhoefer   +3 more
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Structural Response to Uncertain Seismic Excitations

Journal of Structural Engineering, 1986
Probabilistic and statistical descriptors are developed for the response of nonhysteretic oscillators subject to modulated Gaussian ground acceleration with uncertain scale. The probabilistic descriptors correspond to postulated values of the scale of the ground acceleration process while the statistical descriptors account for the uncertainty in this ...
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Control of Structures Subjected to Seismic Excitation

Journal of Engineering Mechanics, 1983
Complex structures represent assemblages of distributed components such as beams, columns, etc. A method capable of modeling complex structures is the finite element method. The resulting discrete model generally possesses a large number of degrees of freedom, and only a given number of lower modes can be computed accurately.
Leonard Meirovitch, Lawrence M. Silverberg   +1 more
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Magnetic Perturbations Excited by Seismic Waves

Physica Scripta, 2001
Magnetic field perturbations on the Earth's surface and in the ionosphere excited by atmospheric acoustic waves have been investigated. The mechanism of the excitation consists of the growth of the atmospheric acoustic waves, caused by an earthquake, carried upwards and exciting Alfven and fast magnetosonic waves in the ionosphere.
S V Koshevaya, V V Grimalsky, G N Burlak, R Pérez Enríquez, A N Kotsarenko   +4 more
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Excitation of seiches in channels by seismic waves

Deep Sea Research and Oceanographic Abstracts, 1965
Description of seiches which occurred along the Gulf Coast of the United States and in Norway at the times of the Alaskan earthquake of 1964 and the Assam earthquake of 1950 are reviewed. An analytical expression is derived for the effect of seismic surface waves on a water channel of width L and depth H.
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Spatial Seismic Excitations and Response Spectra

Journal of Engineering Mechanics, 1993
A random‐vibration‐based force‐response spectrum of a simple oscillating frame is proposed as a simplified measure of the effect of spatial seismic excitations on structures. Such a response spectrum reflects the effect of incoherent support motions on quasi‐static and dynamic response of structures.
Zbigniew Zembaty, Steen Krenk
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Maximum Structural Response to Seismic Excitations

Journal of the Engineering Mechanics Division, 1970
A method is presented by which a least favorable structural response can be estimated to the excitation of nondeterministic nature such as earthquake acceleration. Under the assumption that a fair amount of information on the modulus of the Fourier transform of the excitation makes it possible to select an envelope of the modulus, the present approach ...
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Active Control of Seismic‐Excited Buildings

Journal of Structural Engineering, 1985
An investigation is made of the possible application of both the active tendon and active mass damper control systems to buildings excited by strong earthquakes. The effectiveness of both active control systems as measured by the reduction of coupled lateral-torsional motions of buildings is studied.
B. Samali, J. N. Yang, S. C. Liu
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