1 AIT Asian Institute of Technology

Identification of dynamic properties of tall buildings in Bangkok by an ambient vibration method

AuthorTeerapol Leelawannee
Call NumberAIT Thesis no. ST-01-9
Subject(s)Tall buildings--Thailand--Bangkok--Aerodynamics

NoteA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
PublisherAsian Institute of Technology
AbstractIt is well known that dynamic properties of tall buildings play an important role in the analysis and design of these structures. In this study, dynamic properties of tall buildings in Bangkok are identified from their ambient vibrations. A frequency-domain identification method, developed by Trifunac, is adopted. Some modifications are also made to this method in order to extract more detailed information ibration mode shapes from the ambient responses. Three uniaxial accelerometers and one portable high-resolution recorder are employed to measure and record ambient vibrations. Human exciters are also used for exciting some vibration modes that do not significantly participate in the ambient responses. It is shown that the use of human exciters has greatly improved the accuracy of the obtained results. Several digital signal processing techniques are applied; these techniques are, for example, FFT, moving average, cosine-ta~r window, etc. Nine reinforced concrete buildings with heights between I 00 m and 150 m in Bangkok are selected in this study. In each building, natural frequencies, damping ratios, and vibration mode shapes of the first four to six translational and torsional modes are successfully and accurately identified. It is also found that some modes exhibit rather complex motions consisted of translational and torsional motions.
Year2001
TypeThesis
SchoolSchool of Engineering and Technology (SET)
DepartmentDepartment of Civil and Infrastucture Engineering (DCIE)
Academic Program/FoSStructural Engineering (STE) /Former Name = Structural Engineering and Construction (ST)
Chairperson(s) Pennung Warnitchai ;
Examination Committee(s)Worsak Kanok-Nukulchai ;Barry, William Joseph;
Scholarship Donor(s)H.M. King's Scholarship;
DegreeThesis (M.Eng.) - Asian Institute of Technology, 2001


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