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008			201099s1999 th uu m rtt 00| a1eng d
035			_a.b11764673
099		9	_aAIT Thesis no. ST-99-28
100	0		_aPraween Chusilp
245	1	0	_aApplication of digital filtering to investigate higher mode effects on nonlinear seismic responses in wall-type buildings
260			_aBangkok : _bAsian Institute of Technology, _c1999
300			_a112 leaves : _bill.
490	1		_aThesis ; _vno. ST-99-28
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1999
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Civil Engineering
520			_aThe effects of higher vibration modes on nonlinear seismic responses in wall-type buildings are investigated. Wall-type buildings with different numbers of stories and different design inelastic levels are modeled as isolated cantilever walls with bilinear hysteretic behavior. The structures are subjected to a single earthquake ground motion record and their nonlinear seismic responses are determined by performing nonlinear dynamic analyses through DRAIN-2DX Program. Seismic responses of interest are story shears, story moments, and story displacements. In the first step, the higher mode effects on these responses are identified in a typical way, that is by using the ratio of maximum response of a MDOF system to that of the SDOF counterpart. The results confirm that the amplification of seismic responses due to higher mode effects increases significantly with the structure period and the design inelastic level. The importance of higher modes is noticed in this step. A more effective technique for investigating higher mode effects on nonlinear seismic responses, so-called digital filtering, is introduced. By employing this technique, modal responses can be decomposed from the total one. Response histories in the first three modes are obtained. The variation of mode shapes and force distribution patterns, maximum modal responses, and contribution of each mode to maximum total responses are consequently evaluated. These results qualitatively reflect mechanism of higher mode vibrations of inelastic systems. It is evidenced that the validity of application of digital filtering to decompose responses in higher modes is satisfactory in cases of shear and moment responses. Filtered displacement responses in higher modes are found to be inaccurate.
650		0	_aBuildings _xEarthquake effects
700	0		_aPennung Warnitchai, _eChairperson
700	1		_aWijeyewickrema, Anil C., _eExamination committee
700	1		_aTakewaka, Koji, _eExamination Committee
710	2		_aAsian Institute of Technology Partial Scholarship, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. ST-99-28
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B13061
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