Browsing by Author "Bergman, Lawrence A."

Now showing 1 - 3 of 3

Citation - WoS: 1
Citation - Scopus: 1
Kablolu Bir Köprünün Deprem Davranışının Μ-sentezli Aktif Kontrolü
(TMMOB İnşaat Mühendisleri Odası, 2009) Turan, Gürsoy; Voulgaris, Petros; Bergman, Lawrence A.; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
Bu çalışmada çeşitli kontrol algoritmalarının etkinliğini birbiriyle karşılaştırmak amacıyla oluşturulmuş bir kablolu köprü kontrol model örneği [1, 2] baz alınmıştır. Köprünün sonlu elemanlar modeli modal önem sırasına göre küçültülerek 1/6 boyutunda bir kontrol tasarım modeli elde edilmiştir. Köprünün deprem hareketi sırasındaki kritik noktaları dikkatle gözlenmiş, ve yol seviyesinde kule kesme kuvvetlerinin oluştuğu noktaların kontrolü en zor noktalar olduğunu ortaya konmuştur. Kontrol amaçlı olarak hidrolik pistonlar kullanılmıştır. Belirsizliği tolere edebilen bir tasarım önerisiyle, tasarım modeli ile değerlendirme modeli arasındaki fark sınanmıştır. Ayrıca μ-sentezi esas alınarak bir kontrol denklemi kurgulanmıştır ve bununla birlikte davranış benzetimi gerçekleştirilmiştir.
Citation - WoS: 130
Citation - Scopus: 183
Phase I Benchmark Control Problem for Seismic Response of Cable-Stayed Bridges
(American Society of Civil Engineers (ASCE), 2003-07) Dyke, Shirley J.; Caicedo, Juan Martin; Turan, Gürsoy; Bergman, Lawrence A.; Hague, Steven T.; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
This paper presents the problem definition for the first generation of benchmark structural control problems for cable-stayed bridges. The benchmark problem is based on the Bill Emerson Memorial Bridge that is currently under construction in Cape Girardeau, Missouri. Construction of the bridge is expected to be completed in 2003. The goal of this study is to provide a testbed for the development of strategies for the control of cable-stayed bridges. Based on detailed drawings, a three-dimensional evaluation model has been developed to represent the complex behavior of the full scale benchmark bridge. The linear evaluation model is developed using the equations of motion generated around the deformed equilibrium position. Evaluation criteria are selected that are consistent with the goals of seismic response control of a cable-stayed bridge. Control constraints ensure that the results are representative of a control implementation on the physical structure. Each participant in this benchmark study is given the task of defining (including devices, sensors, and algorithms), evaluating, and reporting on their proposed control strategies. These strategies may be either passive, active, semiactive, or a combination thereof. A simulation program is provided to facilitate direct comparison of the capabilities and efficiency of the various control strategies. The problem is available through the internet in the form of a set of MATLAB programs and includes a sample control design to guide participants through the benchmark problem.
Citation - Scopus: 100
Phase Ii Benchmark Control Problem for Seismic Response of Cable-Stayed Bridges
(Pitagora Editrice, 2003-07) Caicedo, Juan Martin; Dyke, Shirley J.; Moon, Seokjun; Bergman, Lawrence A.; Turan, Gürsoy; Hague, Steven T.; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
This paper presents the problem definition for the second generation of benchmark structural control problems for cable-stayed bridges. The goal of this study is to provide a testbed for the development of strategies for the control of cable stayed-bridges. Based on detailed drawings of the Bill Emerson Memorial Bridge, a three-dimensional evaluation model has been developed to represent the complex behavior of the full-scale benchmark bridge. Phase II considers more complex structural behavior than phase I, including multi-support and transverse excitations. Evaluation criteria are presented for the design problem that are consistent with the goals of seismic response control of a cable-stayed bridge. Control constraints are also provided to ensure that the benchmark results are representative of a control implementation on the physical structure. Each participant in this benchmark bridge control study is given the task of denning, evaluating and reporting on their proposed control strategies. Participants should also evaluate the robust stability and performance of their resulting designs through simulation with an evaluation model which includes additional mass due to snow loads. The problem and a sample control design have been made available in the form of a set of MATLAB equations.