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- W2364365086 abstract "In this paper, a survey is made over the existing theories of seismic forces onstructures. It is found that all the theories fall into one of the following cate-gories: 1) the so-called statical which considers the structure subject toan equivalent constant acceleration; 2) theories based upon simulated simplified ground motions; 3) theories based upon recorded actual ground motions; 4) theories based upon random impulses. Critical comments have been given to the above theories, especially to thefourth one. The writer further gives a brief but cpmplete description of the responsespectra of the structure and on this basis, all the theories are co-related. Computations made by G. W. Housner for major American earthquakes dis-close that the acceleration spectra for damped system are flat curves withoutoutstanding peak value. For this reason, the writer deems that for certain typeof structures, variation of the acceleration spectral value for different modes of vibration will be small, and may be taken approximately as a constant. As aresult, the seismic forces reduce to this constant spectral acceleration times the.mass of the structure. It is suggested to use this method for estimatingthe base shear but make proper adjustment in its distribution along the height ofthe structure. It is also proposed to tie up this spectral acceleration to the earth-quake intensity scale. Finally, the writer stresses that further development of the theory of seismicforces on structures depends upon researches along following lings: 1) strong-motion program; 2) dynamical properties of structures and materials; 3) effectsof foundation conditions; 4) vertical and torsional seismic forces; 5) co-relationbetween seismic forces and earthquake intensity." @default.
- W2364365086 created "2016-06-24" @default.
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- W2364365086 date "1958-01-01" @default.
- W2364365086 modified "2023-09-22" @default.
- W2364365086 title "SEISMIC FORCES ON STRUCTURES" @default.
- W2364365086 hasPublicationYear "1958" @default.
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