000			03640nam a2200385 4500
005			20260817171655.0
008			270798 th eng
035			_a.b10119346
099		9	_aAIT Thesis no.ST-90-14
100	1		_aSedarage, Bandu Gamini
245	1	0	_aBoundary element method for crack growth analysis in concrete structures with nonlinear tension-softening curve
260			_aBangkok : _bAsian Institute of Technology, _c1990
300			_a62 p.
490	1		_aThesis ; _vno. ST-90-14
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1990
520			_aInfluence of the nonlinear tension-softening curve on the fracture behavior of finite size concrete specimens is discussed by using Boundary Element Method (BEM). A boundary element method program is developed for Dugdale-Barenblatt -type model of bridging zone with nonlinear tension-softening curve to investigate the effect of shape of tension-softening curve on the fracture behavior. Boundary integral equations (BIE) equivalent to original crack problems are presented with a consideration on the treatment of crack boundaries. Wedge loaded specimens and three point bending specimens with different sizes are analyzed with linear and nonlinear tension-softening curves. The results for wedge loaded specimens obtained by the present model are compared with those by an existing model and the experimental results. The maximum loads predicted by the present model for three point bending specimens, are also compared with the experimental results. Along bridging zone which is modelled as a part of crack with stress transmitted by aggregate, the transmitted stress and crack opening displacement (normal stress and normal displacement gap) satisfy a given relationship which is called tension-softening curve. The stress intensity factor at the tip of the bridging zone is assumed to be zero which assures that stress is bounded. With these conditions, boundary integral equations are solved numerically where boundary quantities are approximated by piecewise constant functions. For given specimen geometry, loading condition and bridging zone length, an associated value of load is obtained, together with distributions of transmitted stress and crack opening displacement. In general, the transmitted stress is a nonlinear function of the crack opening displacement. To satisfy this nonlinear relationship, Boundary Element Method (BEM) program is modified with Newton-Rapson's method.
650		0	_aConcrete _xCracking
700	1		_aHorii, Hideyuki, _eChairperson
700	1		_aKarasudhi, Pisidhi, _eExamination Committee
700	0		_aWorsak Kanok-Nukulchai, _eExamination Committee
710	2		_aNorwegian Government (NORAD), _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. ST-90-14
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B18565
907			_a.b10119346 _bmnait _cs
902			_a240411
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945			_lmnait
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