Results 171 to 180 of about 2,652 (218)

Seismic Response of Underground Structure under Vertical Seismic Excitation

Advanced Materials Research, 2014
Seismic response of shallowly buried underground under vertical seismic excitation is studied. In order to simplify the analysis two steps are adopted in the analysis. In the first step structure is looked at as rigid body, and the dynamic response of the structure under vertical seismic excitation is obtained on the basis of soil-structure dynamic ...
Cheng Zhi Qi, Xu Liu, Guo Hua Li, Deng Pan, Jian Luo   +4 more
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A Hybrid Control of Seismically Excited Structures by Confinement of Vibrations

Journal of Vibration and Control, 2004
We propose a hybrid control strategy, aimed at confining and suppressing simultaneously the vbratory motion in seismically excited structures. It is assumed that these structures are composed of n floors that are sensitive to vibrations, resulting from earthquake excitations. A number (m) of inter-story bracing elements, assumed to be the non-sensitive
Choura, S., El-Borgi, S., Nayfeh, A. H.
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Researching of Seismic Wave Excitation Technology

Advanced Materials Research, 2014
Currently, the seismic wave technique increasingly used in mineral exploration, detecting buried targets etc. Conventional seismic wave excitation technique has many drawbacks. This paper summarizes the advantages and disadvantages of various seismic wave excitation technology, practical applications may need to select the appropriate source technology
Xu Fang Zhu, Bing Yan
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Seismic Excitation of the Chandler Wobble

1970
Results from the elasticity theory of dislocations as well as observational evidence are presented in support of the hypothesis of seismic excitation of the Chandler wobble. There appears to be a high degree of correlation between changes in the pole path and earthquakes with M > 7.5 in the 11 year period from 1957.0 to 1968.0.
L. Mansinha, D. E. Smylie
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Seismic excitation by the space shuttle Columbia

Nature, 1991
Seismic stations in southern California recorded the atmospheric shock waves generated by the space shuttle Columbia on its return to the Edwards Air Force base on 13 August 1989 (Fig. 1). In addition to the shock wave, the broad-band IRIS–TERRAscope station at Pasadena recorded a distinct pulse with a period of ~2–3 seconds, which arrived 12.5 seconds
Kanamori, Hiroo, Mori, Jim, Anderson, Don L., Heaton, Thomas H.   +3 more
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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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