An Effect of Uplift Pressure Applied to Concrete Gravity Dam on the Stress Intensity Factor

- Journal title : Journal of the Korea Concrete Institute
- Volume 16, Issue 6, 2004, pp.841-850
- Publisher : Korea Concrete Institute
- DOI : 10.4334/JKCI.2004.16.6.841

Title & Authors

An Effect of Uplift Pressure Applied to Concrete Gravity Dam on the Stress Intensity Factor

Lee Young-Ho; Jang Hee-Suk; Kim Tae-Wan; Jin Chi-Sub;

Lee Young-Ho; Jang Hee-Suk; Kim Tae-Wan; Jin Chi-Sub;

Abstract

The modeling of uplift pressure within dam, on the foundation on which it was constructed, and on the interface between the dam and foundation is a critical aspect in the analysis of concrete gravity dams, i.e. crack stability in concrete dam can correctly be predicted when uplift pressures are accurately modelled. Current models consider a uniform uplift distribution, but recent experimental results show that it varies along the crack faces and the procedures for modeling uplift pressures are well established for the traditional hand-calculation methods, but this is not the case for finite element (FE) analysis. In large structures, such as dams, because of smaller size of the fracture process zone with respect to the structure size, limited errors should occur under the assumptions of linear elastic fracture mechanics (LEFM). In this paper, the fracture behaviour of concrete gravity dams mainly subjected to uplift Pressure at the crack face was studied. Triangular type, trapezoidal type and parabolic type distribution of the uplift pressure including uniform type were considered in case of evaluating stress intensity factor by surface integral method. The effects of body forces, overtopping pressures are also considered and a parametric study of gravity dams under the assumption of LEFM is performed.

Keywords

uplift pressure;stress intensity factor;surface integral method;LEFM;

Language

Korean

Cited by

References

1.

Resher, O. J, 'lmportance of Cracking in Concrete Dams,' Engineering Fracture Mechanics, Vol.35, 1990, pp.503-524

2.

Linsbauer, H. N., Ingraffea, A R, Rossmanith, H. P., and Wawryzynek, P. A, 'Simulation of Cracking in Large Arch Dam : Part I,' Journal of Structural Engineering, Vol.115, No.7, 1989, pp.1599-1615

3.

Linsbauer, H. N., Ingraffea, A R, Rossmanith, H. P, and Wawryzynek, P. A, 'Simulation of Cracking in Large Arch Dam : Part II,' Journal of Structural l Engineering, Vol.115, No.7, 1989, pp.1616-11630

4.

Plizzari, G. A 'LEFM Application to Concrete Gravity Dams,' Journal of Engineering Mechaniccs, Vol.123, No.8, 1997, pp.808-815

5.

Dewey, R R, Reich, R. W., and Saouma, V. E., 'Uplift Modeling for Fracture Mechanics Analysis of Concrete Dams,' Journal of Structural Division, Vol.120, No.10, 1994, pp.3025-3044

6.

Plizzari, G. A 'On The Influence of Uplift Pressure in Concrete Gravity Dams,' Journal of Engineering Fracture Mechanics, Vol.59, No.3, 1998, pp.253-267

7.

Briuhwiler, E. and Saouma, V. E. 'Water Fracture Interaction in Concrete - Part II : Hydrostatic Pressure in Cracks,' ACI Material Journal, Vol.93, No.4, 1915, pp.383-390

8.

Jin, C. S., Jang, H. S and Choi, H. T., 'The Calculation of Stress Intensity Factors by the Surface Integral Method,' Structural Engineering and Mechanics, Vol.3, No.6, 1995, pp.541-554

9.

진치섭, 최현태, 이홍주, '균열면 압력을 고려한 응력 확대계수의 결정에 관한 연구', 콘크리트학회 논문집, 7권, 3호, 1995, pp.175-186

10.

장희석, '균열면에 수압을 받는 중력식 콘크리트 댐의 파괴거동에 관한 연구', 전산구조공학회 논문집, 9권, 4호, 1996, pp.189-198