摘要:

AbstractThe computation of stresses within a finite element displacement method analysis of a shell of revolution is considered. The common procedure of applying the kinematic and constitutive laws to the displacement functions is examined and justified for models where the displacements are represented by high‐order polynomial expansions. Also, two alternative computational formats within this technique are explored.The influence of the column‐supported base condition on a hyperboloidal shell of revolution is studied with respect to the stresses calculated from a response spectrum analysis. These studies emphasize the importance of accurately modelling the base region of a column‐supported shell such as a hyperbolic cooling

ISSN:0098-8847    

DOI:10.1002/eqe.4290050102

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

摘要:

AbstractA study is made of the dynamic behaviour of multistorey steel rigid‐frame buildings with set‐back towers. The effects of set‐backs upon the building frequencies and mode shapes are examined. Then the effects of set‐backs on seismic response are investigated by analysing the response of a series of set‐back building frame models to the El Centro ground motion. Finally, the computed responses to the El Centro earthquake are compared with some code provisions dealing with the seismic design of set‐back buildings.The conclusions derived from the study include the following:1.The higher modes of vibration of a set‐back building can make a very substantial contribution to its total seismic response; this contribution increases with the slenderness of the tower.2.Some of the important response parameters for the tower portion of a set‐back building are substantially larger than for a related uniform building.3.For very slender towers, the transition region between the tower and the base may be subjected to very larg

ISSN:0098-8847    

DOI:10.1002/eqe.4290050103

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

摘要:

AbstractAn approximate method is proposed for evaluation of the natural frequencies and mode shapes of uniform asymmetric wall‐frame structures. An exact solution is first given for the case in which the coefficient matrix of the dynamic equilibrium equations satisfies certain conditions. Using perturbation analysis, the method is then applied to the more general case in which these conditions are only approximately satisfied. A numerical example is presented to illustrate the techniqu

ISSN:0098-8847    

DOI:10.1002/eqe.4290050104

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

摘要:

AbstractFour sites (a, b, c, d) are considered of differing seismicity. The calculations, for two different buildings on each site, consisted of:1.The total monetary cost as a function of the design seismic coefficient c.2.The marginal cost of a saved life, ΔD/ΔL, also depending on c.3.The ratios between the design seismic coefficients in the various sites, cd/ca, cd/cb, cd/cc, that lead to the same marginal cost ΔD/ΔL in all sites.The marginal cost ΔD/ΔL turns out to be highly sensitive to uncertainties, but the other ratios are scarcely influenced by the uncertainties met in analysing the problem. This would suggest the adoption of a rationalized principle for comparing the levels of severity in the Codes for sites with differing degrees of seismicity.If a criterion for evaluating indirect cost due to damage or collapse is fixed for each building and each site the values of c corresponding to minimum monetary cost are not strongly influenced by the said uncertainties. This would make it possible to look into the problem of the minimum levels of severity in the Codes. Of course, this assumes that the levels of severity should always be higher than those corresponding to the minimum monetary

ISSN:0098-8847    

DOI:10.1002/eqe.4290050105

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

摘要:

AbstractA study has been made of the dynamic contact stresses that the foundation of a nine‐storey reinforced concrete building exerts on the soil during forced vibration tests. The effects of the flexibility of the foundation on the contact stress distribution and on the force‐displacement relationship for the foundation have been examined in an attempt at testing several simplifying assumptions commonly used in soil‐structure interaction studies. Comparisons of calculated and observed ground displacements induced by soil‐structure interaction in the immediate neighbourhood of the building have also been pr

ISSN:0098-8847    

DOI:10.1002/eqe.4290050106

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

摘要:

AbstractThe coupled torsional‐flexural vibration of open‐section shear walls, braced by connecting beams at each floor level, is analysed on the basis of Vlasov's theory of thin‐walled beams. The basic dynamic equations and boundary conditions are derived from Hamilton's principle, and a numerical solution obtained by the Ritz‐Galerkin method. In addition to the primary torsional and flexural inertias, secondary effects due to rotatory and warping inertia forces have also been taken into account. The method is suitable for both rigid and flexible base conditions.A series of numerical examples is presented in which analytical results are compared with available experimental data, and the effects of secondary inertia forces, base flexibility and connecting beams upon the vibration characteristics of such shear walls are examined for two different structura

ISSN:0098-8847    

DOI:10.1002/eqe.4290050107

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290050108

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290050101

出版商:John Wiley&Sons, Ltd    

年代:1977

数据来源: WILEY