000			03679nas a2200397 a 4500
005			20260817163127.0
008			110303s2010 th uu|m rtt 0| a1eng d
035			_a.b12091170
099		9	_aAIT Thesis no.OTM-10-06
100	0		_aWitcha Leepipatpaiboon
245	1	3	_aAn appropriate fea modeling technique for on-bottom roughness analysis
260			_aPathum Thani, Thailand : _bAsian Institute of Technology, _c2010
300			_a197 p. : _billl.
490	1		_aThesis ; _vno. OTM-10-06
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Offshore Technology and Management, School of Engineering and Technology
502			_aThesis (M.Eng.) - Asian Institute of Technology, 2010
520			_aPipeline spanning analysis is the one of critical criteria for pipeline design. An evaluation of an allowable free-span length is required in pipeline design. However, the possible free span for checking against the allowable limit is important as the free span is the unknown value until pipeline already laid. The pipeline will suffer in the buckling effect and overstress if the free span is exceed than the allowable length. On-bottom roughness analysis is a name of computer simulation using for finding the pipeline configuration on the seabed. The simulation is taken care by ABAQUS program. The simulation results depend on several parameters including (i) Analysis boundary conditions, (ii) Type of elements, (iii) Soil modeling technique and (iv) Environmental modeling technique. Variation of these parameters leads to significant divergence of simulation results. The appropriate parameters shall be selected to ensure the simulation result is realistic. This study is to determine the appropriate finite element modeling technique for on-bottom roughness analysis. Three parameters including (i) Analysis boundary conditions, (ii) Type of elements, (iii) Soil modeling technique, were selected as variable in analysis. The appropriate model will be selected by degree of span accuracy, degree of conservative model and suitably run-time and resource. The appropriate model should be accurate and conservative in time and resource limitation. The boundary condition 1 and 4 are the appropriate models especially boundary condition which uses less time and resource for analysis. B33H element is conservative in the pipeline spanning while PIPE31H element is conservative in maximum von mise stress.
650		0	_aPipelines _xDesign and construction
700	1		_aChiu, Gregory L.F., _eChairperson
700	0		_aPornpong Asavadorndeja, _eExamination committee
700	0		_aPennung Warnitchai, _eExamination Committee
710	2		_aRTG Fellowship, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. OTM-10-06
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B03605
907			_a.b12091170 _bmnait _cu
902			_a240402
998			_b0 _c110303 _dm _ea _fu _g3
962			_a000:001:PDF:b1209117:000252:0:0:0:0:0:0 _tAbstract-AIT Thesis no.OTM-10-06 _vn
945			_lmnait
945			_lmnarc
942			_c22
942			_c40
909			_aBarcode : 30050120685820 _bCREATED : 2014-05-19 _cRECORD # : i12800831 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050160006234 _bCREATED : 2016-03-23 _cRECORD # : i12906232 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
999			_c7493 _d7493