摘要:

AbstractThe subject of dynamic response of cable‐stayed bridges has received increasing attention in recent years as this type of bridge becomes ever more popular. In most publications on the dynamic behaviour of cable‐stayed bridges, only cursory treatment is given to many of the details of the actual development of a suitable finite element model. This paper provides a detailed description of the development of one class of linear elastic finite element model for the dynamic analysis of a cable‐stayed bridge. The bridge modelled in this study is the Quincy Bayview Bridge in Illinois. The translation of structural data into a form useful for formulation of a three‐dimensional finite element model is presented in some detail, including evaluation of translational and rotational mass and stiffnesses for the deck, modelling of the towers and cables, modelling of the bearings and considerations for accurate geometric representation between the model and the full‐scale structure. In a companion paper, the modal behaviour predicted by the finite element model is compared to measured ambient vibration properties of the full‐scal

ISSN:0098-8847    

DOI:10.1002/eqe.4290200802

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractAn extensive programme of full‐scale ambient vibration tests has been conducted to measure the dynamic response of a 542 m (centre span of 274 m) cable‐stayed bridge—the Quincy Bayview Bridge in Illinois. A microcomputer‐based system was used to collect and analyse the ambient vibration data. A total of 25 modal frequencies and associated mode shapes were identified for the deck structure within the frequency range of 0–2 Hz. Also, estimations were made for damping ratios. The experimental data clearly indicated the occurrence of many closely spaced modal frequencies and spatially complicated mode shapes. Most tower modes were found to be associated with the deck modes, implying a considerable interaction between the deck and tower structure. No detectable levels of motion were evident at the foundation support of the pier. The results of the ambient vibration survey were compared to modal frequencies and mode shapes computed using a three‐dimensional finite element model of the bridge. For most modes, the analytic and experimental modal frequencies and mode shapes compare quite well, especially for the vertical modes. Based on the findings of this study, a linear elastic finite element model appears to be capable of capturing much of the complex dynamic behaviour of the bridge with very good accuracy, when compared to the low‐level dynamic responses induced by ambient wind and traffi

ISSN:0098-8847    

DOI:10.1002/eqe.4290200803

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractA method is proposed for the deterministic and stochastic non‐stationary analysis of linear composite systems with cascaded secondary subsystems subjected to a seismic input. This method makes it possible to evaluate, by means of a unitary formulation, the deterministic and non‐stationary stochastic response of both classically and non‐classically damped subsystems and of secondary subsystems multiply supported on the primary one, as well as the ground. The proposed procedure is very efficient from a computational point of view, because of the Kronecker algebra systematically employed. Indeed, by using this algebra, it is possible to obtain in a very compact and elegant form the eigenproperties of the composite system as a function of the eigenproperties of the two subsystems taken separately. Moreover, it is possible to write the first order differential equations governing the evolution of the second order moments of the response and to solve them in a simpl

ISSN:0098-8847    

DOI:10.1002/eqe.4290200804

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractA series of shaking table tests was performed on three small‐scale models of a monolith of a concrete gravity dam in order to simulate earthquake shaking. The purpose of the tests was to examine the nature of crack formation in a gravity dam and the stability of the dam in the presence of cracks. No failures occurred even though the levels of shaking employed were unrealistically high. The good performance owed to the development of crack profiles which had favourable orientations to resist sliding failures in each case. However, the development of an unfavourable crack profile, which cannot be ruled out, and the possibility of water intrusion into open cracks, something not included in the experiments, could lead to failure under significantly lower levels of excitation than those employe

ISSN:0098-8847    

DOI:10.1002/eqe.4290200805

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractA substructure approach is used to estimate the stiffness and damping coefficients of structures from measurement of dynamic responses. The structures are decomposed into smaller subsystems for which state and observation equations are formulated and solved by the method of extended Kalman filter with a weighted global iteration algorithm. Substructural identification methods with and without overlapping members are proposed. In both methods, the convergence of the structural parameters to the optimal values is improved significantly with less computation time as compared to a complete structural approach. Numerical simulation studies are performed for three types of structures, namely a shear building, a plane frame building and a plane truss bridge. The effects of measurement noise and response observations required for identification of system parameters are also investigated.

ISSN:0098-8847    

DOI:10.1002/eqe.4290200806

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290200807

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290200808

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290200809

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290200810

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0098-8847    

DOI:10.1002/eqe.4290200811

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY