Accounting for frequency content of earthquakes in the control of structures

Pnevmatikos, N; Gantes, C

dc.contributor.author	Pnevmatikos, N	en
dc.contributor.author	Gantes, C	en
dc.date.accessioned	2014-03-01T02:49:42Z
dc.date.available	2014-03-01T02:49:42Z
dc.date.issued	2004	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/34695
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-84857463448&partnerID=40&md5=b78ae46b833405ecb605f70d0f901df2	en
dc.subject	Classical control	en
dc.subject	Closed-loop eigenvalues	en
dc.subject	Control demands	en
dc.subject	Control of structure	en
dc.subject	Controlled system	en
dc.subject	Damping ratio	en
dc.subject	Earthquake action	en
dc.subject	Earthquake frequency	en
dc.subject	Eigen frequencies	en
dc.subject	Eigenvalues	en
dc.subject	Elastic analysis	en
dc.subject	Feedback matrices	en
dc.subject	Frequency contents	en
dc.subject	Main frequency	en
dc.subject	Numerical example	en
dc.subject	Optimum number	en
dc.subject	Pole placement	en
dc.subject	Pole placement algorithms	en
dc.subject	Real time	en
dc.subject	Structural behaviors	en
dc.subject	Algorithms	en
dc.subject	Civil engineering	en
dc.subject	Dynamic analysis	en
dc.subject	Eigenvalues and eigenfunctions	en
dc.subject	Poles	en
dc.subject	Poles and zeros	en
dc.subject	Spectrum analyzers	en
dc.subject	Earthquakes	en
dc.subject.other	Classical control	en
dc.subject.other	Closed-loop eigenvalues	en
dc.subject.other	Control demands	en
dc.subject.other	Control of structure	en
dc.subject.other	Controlled system	en
dc.subject.other	Damping ratio	en
dc.subject.other	Earthquake action	en
dc.subject.other	Earthquake frequency	en
dc.subject.other	Eigen frequencies	en
dc.subject.other	Eigenvalues	en
dc.subject.other	Elastic analysis	en
dc.subject.other	Feedback matrices	en
dc.subject.other	Frequency contents	en
dc.subject.other	Main frequency	en
dc.subject.other	Numerical example	en
dc.subject.other	Optimum number	en
dc.subject.other	Pole placement	en
dc.subject.other	Pole placement algorithms	en
dc.subject.other	Real time	en
dc.subject.other	Structural behaviors	en
dc.subject.other	Algorithms	en
dc.subject.other	Civil engineering	en
dc.subject.other	Dynamic analysis	en
dc.subject.other	Eigenvalues and eigenfunctions	en
dc.subject.other	Poles	en
dc.subject.other	Poles and zeros	en
dc.subject.other	Spectrum analyzers	en
dc.subject.other	Earthquakes	en
dc.title	Accounting for frequency content of earthquakes in the control of structures	en
heal.type	conferenceItem	en
heal.publicationDate	2004	en
heal.abstract	The objective of this work is the control of structures by means of the pole placement algorithm, in order to improve their response against earthquake actions. To that effect, the frequency content of the incoming earthquake signal is used. The pole placement is a well-known, classical control algorithm that estimates the feedback matrix so that the system will have poles (eigenvalues) that are pre-decided by the designer. Successful application of the algorithm requires judicious placement of the closed-loop eigenvalues from the part of the designer, as well as a good understanding of the uncontrolled modal structural behavior. In this paper, the choice of location for the closed-loop eigenvalues is based upon the frequency content of the incoming earthquake signal, which is obtained in real time. A parallel spectrum analyzer performs real-time FFT to recognize the main earthquake frequencies. The desired new controlled system eigenfrequencies are chosen to be outside of the main frequency window, which includes the main frequencies of earthquake. Then, the new controlled system eigenvalues (poles) are defined, accounting for the relative uncontrolled damping ratios and the desired eigenfrequencies. The feedback matrix is estimated by pole placement algorithm, and the control demand (equivalent forces) is obtained via dynamic elastic analysis. The proposed approach is demonstrated by means of numerical examples, where a three and an eight-story building are analyzed. Conclusions regarding the optimum number of poles and their location with respect to the main frequency window of the incoming earthquake are drawn. © 2004 Taylor & Francis Group, London.	en
heal.journalName	5th International PhD Symposium in Civil Engineering - Proceedings of the 5th International PhD Symposium in Civil Engineering	en
dc.identifier.volume	2	en
dc.identifier.spage	1451	en
dc.identifier.epage	1460	en