03408nas|a2200421 i 4500 20260818134207.0 150900s2000 th uzm rtt 00| a1eng d .b11807787 AIT Thesis no.ST-00-15 Somchit Amnatsan Identification of dynamic properties of buildings and structures from microtremor vibrations Bangkok : Asian Institute of Technology, 2000 72 leaves Thesis ; no. ST-00-15 A thesis submitted in partial fulfillment of requirements for the degree of Master of Engineering, School of Civil Engineering Thesis (M.Eng.) - Asian Institute of Technology, 2000 The main problem of using the displacement-measuring transducer or velocitymeasuring transducer to identify dynamic properties of structures is the distortion between the electrical output and the input structural vibration if structures vibrate at the frequency below the natural frequency of transducers. The signal obtained from these transducers cannot be used in some applications where the actual contribution of the vibration at each frequency must be known. This study uses the accelerometers, which have a linear proportion between the output signal and the input vibration in the frequency range from DC to 50 Hz, to identify dynamic properties of buildings and structures from microtremor vibration. Two accelerometers and a high-resolution data acquisition unit were used to identify dynamic properties of various types of structures such as a pedestrian bridge, floor structures and a tall building. It was found that accurate dynamic properties could be obtained with this small set of vibration-measuring instrument. Dynamic properties obtained from the Fast Fourier .Transform technique are in good agreement with those obtained from the random decrement technique. The modes of vibrations that contribute significant effect to total structural vibrations fall within the frequency bandwidth of the accelerometer. The acceleration signal obtained from this accelerometer is, therefore, very useful for the application that the contributions of vibrations at all frequencies must be known such as the application of vibration-control system. Buildings Vibration Structural dynamics Vibration Measurement Pennung Warnitchai, Chairperson Worsak Kanok-Nukulchai, Examination Committee Barry, William Joseph, Examination Committee Royal Thai Government, Scholarship donor Human Resources Development Phase II, Scholarship donor Asian Institute of Technology. Thesis ; no. ST-00-15 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B06840 .b11807787 mnait u 240331 0 000915 m a u 0 mnait mnarc 22 40 Barcode : 30050120747166 CREATED : 2014-05-30 RECORD # : i12805087 LPATRON : 1028229 LCHKIN : 2018-06-08 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050160102157 CREATED : 2016-04-21 RECORD # : i12943666 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 57496 57496 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.ST-00-15 30050120747166 2026-08-18 13:42:07 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.ST-00-15 30050160102157 2026-08-18 13:42:07 1 2026-08-18 40