摘要:

AbstractAs a means towards an understanding of the structural dynamics of deepwater gravity platforms, the dynamic response of a linear two degree of freedom spring‐mass‐damper system is studied herein. The mathematical model represents dynamic interaction between structure and foundation. Particular attention is paid to the influence of wave force distribution. Transfer functions are obtained for the response to sinusoidal waves, and resonant magnification factors are plotted for a range of structural and loading parameters. It is concluded that the response even of this simple idealization is far from straightforw

ISSN:0098-8847    

DOI:10.1002/eqe.4290060402

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

摘要:

AbstractSome existing models for the simulation of earthquake acceleration show the difficulties in determining the involved parameters and in describing frequency content. A non‐stationary modulated random process obtained as the product of a time envelope function and a stationary random function is used to simulate earthquake acceleration. The parameters and the distribution of frequencies of the simulation process are obtainable from past earthquake records. This simple and realistic model is suggested for use as the input process in aseismic design of structure

ISSN:0098-8847    

DOI:10.1002/eqe.4290060403

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

摘要:

AbstractThis paper presents the application of the finite element method for analysing the two‐dimensional response of reservoir‐dam systems subjected to horizontal ground motion. The interaction between the dam and the reservoir as well as the compressibility of water has been taken into account. The complete system has been considered to be composed of two substructures, namely the reservoir and the dam. To take into account the large extent of the reservoir, it has been idealized using specially developed infinite elements coupled with standard finite elements while the dam is represented using finite elements alone. Structural damping of the dam and radiation damping in the fluid phase have been accounted for in the analysis. It is concluded that the effect of radiation damping is considerable at high frequencies of excitation. The coupled response of the system is significantly large at and near the fundamental natural frequency of the system in comparison to the uncoupled responses. The method is computationally quite economical, capable of taking into account the arbitrary geometry of the system and is recommended for practical application. Further applications and extensions of the approach to three dimensional analyses are possi

ISSN:0098-8847    

DOI:10.1002/eqe.4290060404

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

摘要:

AbstractA computational scheme is presented to construct torsional spectra due to the rotational component of seismic ground motions. The rotational component of ground motion is estimated from the measured earthquake acceleration records. In contrast to previous studies, no differentiation of acceleration records is involved in the present scheme. The torsional spectrum of the 1940 El Centro earthquake is computed and compared with previous results. An average and a mean plus one standard deviation torsional spectrum is presented for design purposes. These spectra are results based on four historical records (1934 El Centre, 1940 El Centro, 1949 Olympia and 1952 Taft) normalized to the 1940 El Centro intensity.

ISSN:0098-8847    

DOI:10.1002/eqe.4290060405

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

摘要:

AbstractMany existing buildings in seismically active areas were constructed prior to the acceptance of any design criteria specifically intended to produce earthquake resistance in the structure. Although such buildings are typically fifty or more years old they still constitute a large proportion of occupied domestic and commercial accommodation. Since almost all these structures comprise greater hazards than more recent constructions they are referred to as High Earthquake Risk buildings.The problems of identification, assessment and alleviation of the deficiencies have received increasing attention in recent years. In this paper some New Zealand experience is recounted.

ISSN:0098-8847    

DOI:10.1002/eqe.4290060406

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

摘要:

AbstractThe engineering aspects of the 4 March 1977 Romanian earthquake are presented. They are based upon a field investigation conducted by the writers in Bucharest and in southern Romania in collaboration with members of the Building Research Institute of Romania, during the period 25–31 March 1977.This report covers general observations, data and evaluation on the character of the earthquake, structural damage inflicted by it, performance of different types of buildings during the earthquake and relief operation

ISSN:0098-8847    

DOI:10.1002/eqe.4290060407

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290060408

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290060409

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290060401

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY