摘要:

AbstractThe non‐linear response history and failure mechanism of coupled wall systems under dynamic loads and static loads are investigated through an analytical model. The walls and coupling beams are replaced by flexural elements. Axial and shear stiffnesses are included for the wall members. The stiffness characteristics of each member are determined by inelastic properties. The suitable hysteresis loops to each constituent member are established to include the specific characteristics of coupled wall systems. The computed results are compared with results obtained from tests using model structures statically and dynamically tested on the Illinois Earthquake Simulato

ISSN:0098-8847    

DOI:10.1002/eqe.4290070102

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractThe difficulties encountered in the use of standard, Galerkin‐type, parabolic isoparametric elements for explicit transient analysis are illustrated. These are associated with the mass lumping procedure as well as with incoherencies in the nodal loads induced by the element local field. To overcome these difficulties, it is suggested that the parabolic element equations be formulated by a weighted residual method in which the weighting functions are the usual serendipity functions modified by an appropriate bubble‐shape function. It is shown that such a formulation enables all the shortcomings of the Galerkin approach to be overcome. An example problem indicates the extent of improvement in results that can be obtained by the proposed met

ISSN:0098-8847    

DOI:10.1002/eqe.4290070103

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractThe structure analysed herein is a tower and pier system of a long‐span suspension bridge. The tower shaft is modelled to allow classical normal modes decomposition in order to reduce higher modes. The pier is assumed to be rigid body free to translation as well as to rocking motion, being reacted by the surrounding soil compliance that is derived from a continuum mechanics approach. Linear and non‐linear soil and structural dynamic interaction is dealt with by random vibration theory with use of the linearization technique and complex modal analysis. Primary interest is placed on the investigation of the dynamic characteristics of the total interaction system and the rms response with change of the soil condition and input excitation level. Also discussed is the approximate response analysis, using classical normal modes for the interaction system, for purposes of practical des

ISSN:0098-8847    

DOI:10.1002/eqe.4290070104

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractIn December 1976 the new version of Mexico's Federal District Building Code was officially approved. It differs from previous versions in several matters: design values are based on a probabilistic assessment of seismicity, on a more careful and better substantiated consideration of wave filtering through the peculiar lacustrine soil and on approximate design optimization; ductility receives explicit treatment; and there are significant improvements in the treatment of overturning moments, torques, etc. The paper discusses these matters and contains information on code evolution in Mexico and on the implementation in the Federal District.

ISSN:0098-8847    

DOI:10.1002/eqe.4290070105

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractThis paper presents an empirical model for scaling Fourier amplitude spectra of ground acceleration during strong earthquake shaking in terms of the reported Modified Mercalli Intensity (MMI) and the simplified characteristics of the geologic environment at the recording station. This analysis shows that (i) for the intermediate and high‐frequency motions the spectral amplitudes approximately double for every level of the MMI; that (ii) the uncertainties associated with estimation of Fourier spectral amplitudes in terms of MMI are not greater than the uncertainties associated with similar estimation in terms of earthquake magnitude and epicentral distance; that (iii) the high frequency spectral amplitudes tend to be greater on basement rock sites relative to alluvium sites, with this trend being reversed for the low‐frequency spectral amplitudes; and that (iv) the spectral amplitudes of very high‐frequency vertical shaking are equal to or higher than the corresponding spectral amplitudes for horizontal sh

ISSN:0098-8847    

DOI:10.1002/eqe.4290070106

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractIn many parts of the world, subjectively based earthquake intensity scales similar to those of the Modified Mercalli Intensity (MMI) are applied regularly. Although the characteristics of these scales are quite similar, it is often difficult to convert an estimate of strong ground shaking measured by the MMI scale into its equivalent on other scales.In this paper, an instrumental correlation of the Japanese Intensity scale (JMA) with the MMI scale is described. Currently, one common yardstick that is available for both Japan and the United States is the statistic of peak accelerations. The correlation is done by comparing the JMA for sites where the ‘peak acceleration’ is known in Japan with the MMI for sites in the United States where the peak acceleration is also known. To ensure a direct correspondence of peak accelerations in these two countries, the peak values recorded in the U.S. are corrected by determining the peak acceleration as recorded by the Japanese accelerograph, the SMAC, while it is subjected to the excitation recorded in the United Sta

ISSN:0098-8847    

DOI:10.1002/eqe.4290070107

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractA method for evaluating the reliability of ceramic structural members subjected to earthquake‐induced vibrations is presented. The method uses the Weibull distribution to represent the probability of failure of the brittle ceramic material and includes the effects of stress concentrations introduced by flaws and the volume of material subjected to stress. The stress concentration introduced by the complex form of insulators and at the mounting interfaces is considered. A numerical example is given to illustrate the application of the metho

ISSN:0098-8847    

DOI:10.1002/eqe.4290070108

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractThe principal co‐ordinates of non‐proportionally damped systems are coupled by non‐zero off‐diagonal elements in the transformed damping matrix. The effects of this damping coupling are investigated, and it is found that significant errors may occur if the dynamic analysis of such systems is based on a truncated set of the overall system modes, even when the damping coupling between these modes is included in the solution. This effect is illustrated by computed results for an idealized soil‐structu

ISSN:0098-8847    

DOI:10.1002/eqe.4290070109

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290070110

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290070101

出版商:John Wiley&Sons, Ltd    

年代:1979

数据来源: WILEY