摘要:

AbstractThe objective of this work is to experimentally examine some practical issues relating to the reliability and performance of active structural control systems. Using the newly constructed shaking table in the Department of Structural Mechanics at the University of Pavia, experiments were conducted employing an actively controlled, three story test structure. A DC‐motor based active mass driver system was used as the active control device. AnH2/LQG controller based on acceleration feedback is applied to the system. The first objective of this work is to demonstrate the efficacy of the acceleration feedback control strategy. Next, two experiments are conducted with the goal of investigating fault tolerant control system design. In the first case, the occurence of a sensor failure is simulated experimentally, and the resulting controlled performance and robustness characteristics are assessed. The second set of tests is to evaluate the ability of the controller to reduce the structural responses when reduced information is available for control action determination. Both of these issues are important practical concerns in the design and implementation of a structural control syste

ISSN:1122-8385    

DOI:10.1002/stc.4300050101

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

摘要:

AbstractSignificant progress has been achieved in the active control of civil engineering structures in recent years. Although many control algorithms has been proposed, only few experiments in active structural control have been performed. In this paper, active structural control experiments were carried out using a scaled model structure simulating a three‐story steel frame building. The model was subjected to a base motion on a shake table. A neural network based controller was implemented to control the response of the structure. This trained neural controller was implemented to control the response of the structure. It is experimentally verified that the neural network is able to generalized to new inputs, i.e. a properly trained neural network is capable of providing sensible outputs when presented with input data that has never been used during training. Results from this experimental study indicate great promise for the control of civil engineering structures under dynamic loadings using the artificial neural network controlle

ISSN:1122-8385    

DOI:10.1002/stc.4300050102

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

摘要:

AbstractA nonlinear decentralized active tendon controller that substantially reduces the magnitude of the vibrations of a segment of a cable‐stayed bridge induced by a seismic excitation is presented in this paper. The model used to represent the dynamic behaviour of the bridge takes into account the inherent nonlinearities due to the stay cables geometry. This is in contrast with traditional models used by previous designers of active controllers of cable‐stayed bridges, who assumed completely linear models. The proposed controller is comprised of a linear and a nonlinear part. Its performance is verified via digital computer simulat

ISSN:1122-8385    

DOI:10.1002/stc.4300050103

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

摘要:

AbstractControl of structures against environmental loads, such as earthquakes and wind, is generally conceived as the protection of a system with no interaction with the surrounding buildings.When a large facility is considered, subsystems within it are identified and, in case, controlled. Attention is focused throughout this paper on the interaction of these subsytems in extreme conditions. The new concept of controlling the failure mode arises.The paper discusses the motivations leading one to adopt such an approach and the guidelines for its design.

ISSN:1122-8385    

DOI:10.1002/stc.4300050104

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

摘要:

AbstractThe reliability assessment is performed for a highly critical existing structure under lack of information on the actual state of its elements. A non‐standard probabilistic method is adopted: it makes use of “retrospective informati

ISSN:1122-8385    

DOI:10.1002/stc.4300050105

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

ISSN:1122-8385    

DOI:10.1002/stc.4300050106

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY

ISSN:1122-8385    

DOI:10.1002/stc.4300050107

出版商:John Wiley&Sons, Ltd    

年代:1998

数据来源: WILEY