PSI - Issue 42

H. Mazighi et al. / Procedia Structural Integrity 42 (2022) 1714–1720 H.Mazighi and M.K.Mihoubi / Structural Integrity Procedia 00 (2019) 000 – 000

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in Table 2. It can be seen from the table that, the obtained displacement from present study has a fine agreement with Zhang, et al., (2013). Fig. 4. Depicts the displacement time history analysis for the present study. The second part of this study is to subject the Koyna dam to one different earthquake Saguenay 1988, longer and quieter than the first. The horizontal displacement of the dam crest is shown in Fig.5. The maximum crest displacement in upstream direction is 2.60 cm, and in downstream direction attains 9.43 cm. We notice that the crest displacement calculated from the first earthquake is more important than in second case, this result can be explained due to higher acceleration of Koyna earthquake (0.36g) than the Saguenay earthquake (0.24g).

Table 2. Comparison of the Maximum Horizontal Displacement of the Dam Crest Study Crest displacement (cm) in upstream direction

Crest displacement (cm) in downstream direction

Present study

3.92 4.07

2.52 3.41

Zhang, et al., (2013)

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Displacement (mm)

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Time history (s)

Fig.4. Horizontal displacement for dam crest due to Koyna earthquake.

ϭϬ ϭϱ ϮϬ Ϯϱ ϯϬ

Ϭ ϱ

Ͳϭϱ ͲϭϬ Ͳϱ

Displacement (mm)

Ϭ͘ϬϬ

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ϲ͘ϬϬ

ϵ͘ϬϬ

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Time history (s)

Fig.5. Horizontal displacement for dam crest due to Saguenay earthquake.

4.2. Tensile damage The displacement of the dam due to transverse accelerations induced cracks at the dam body, the tensile damage of the Koyna dam calculated to above obtained displacements is investigated as illustrated in Fig.6.