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Discrete crack modeling in concrete ...

Cervenka, Jan.

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Discrete crack modeling in concrete structures.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Discrete crack modeling in concrete structures./
作者:	Cervenka, Jan.
面頁冊數:	287 p.
附註:	Source: Dissertation Abstracts International, Volume: 56-03, Section: B, page: 1583.
Contained By:	Dissertation Abstracts International56-03B.
標題:	Applied Mechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9524288

Discrete crack modeling in concrete structures.
Cervenka, Jan.

Discrete crack modeling in concrete structures. - 287 p.

Source: Dissertation Abstracts International, Volume: 56-03, Section: B, page: 1583.

Thesis (Ph.D.)--University of Colorado at Boulder, 1994.

In this thesis, a comprehensive approach to the modeling of nonlinear behavior of concrete structures using the discrete crack model in the finite element method is proposed.Subjects--Topical Terms:

1018410
Applied Mechanics.

Discrete crack modeling in concrete structures.
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100 1 $a Cervenka, Jan. $3 1917336
245 1 0 $a Discrete crack modeling in concrete structures.
300 $a 287 p.
500 $a Source: Dissertation Abstracts International, Volume: 56-03, Section: B, page: 1583.
500 $a Director: Victor E. Saouma.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 1994.
520 $a In this thesis, a comprehensive approach to the modeling of nonlinear behavior of concrete structures using the discrete crack model in the finite element method is proposed.
520 $a It is generally accepted that the discrete crack approach does not exhibit the strong mesh sensitivity as most of the smeared crack models. In addition, the properties used by the discrete crack model can be directly determined by well established experimental methods. The main disadvantage of this model is the need to modify the finite element mesh at each crack increment. Whereas, various remeshing techniques have been proposed in the literature to address this problem, they all have been restricted to two-dimensional problems, and their extension to three-dimensions is part of the proposed model.
520 $a In this work, a fundamentally different approach to the remeshing problem is adopted. The finite element model is used only as a tool to solve the differential equations of elasticity, and a boundary representation is used for problem definition. The cracks are considered being part of this boundary definition. Thus, each time a violation of the crack propagation criterion is detected in the finite element model, a finite element mesh is adaptively regenerated. From this approach, the classical partial remeshing can be easily recovered as a special case. In addition, this method can be readily extended to error based adaptivity.
520 $a Therefore, in this approach, three levels can be identified: (1) boundary representation of the structure with cracks, (2) finite element model and (3) fracture mechanics based model. In this work, both linear and nonlinear fracture mechanics theories are considered. A new implementation of the domain integral method is proposed for the computation of stress intensity factors along a general three-dimensional crack front. For the nonlinear theory, an interface crack model is used to model the fracture process zone in cementitious materials. This model accounts for the shear effects in the crack, and reduces to classical Hillerborg's fictitious crack model in the case of pure mode I (i.e. opening) fracture. An unconditionally stable constitutive algorithm is developed for the finite element implementation of this model, and on large scale examples, the nonlinear model is shown to approach the linear elastic fracture mechanics solution.
520 $a An algorithm for fully automated mesh generation for structures with cracks is developed based on the properties of Delaunay's triangulation.
520 $a The mixed iterative method is used to improve the behavior of triangular and tetrahedral elements generated by the aforementioned algorithm and to compute continuous stress and strain fields. The continuity of these fields is exploited in the implementation of the various fracture models.
520 $a The proposed methodology is verified on numerous problems with known experimental or analytical results, and is also applied to both two- and three-dimensional non-linear analyses of concrete dams. Fracture mechanics analyses of a buttressed concrete dam provide significantly different results, from those obtained by classical hand calculation, and they clearly demonstrate the importance of mode II fracture for dam sliding stability.
590 $a School code: 0051.
650 4 $a Applied Mechanics. $3 1018410
650 4 $a Engineering, Civil. $3 783781
690 $a 0346
690 $a 0543
710 2 0 $a University of Colorado at Boulder. $3 1019435
773 0 $t Dissertation Abstracts International $g 56-03B.
790 1 0 $a Saouma, Victor E., $e advisor
790 $a 0051
791 $a Ph.D.
792 $a 1994
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9524288