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Structural Engineering and Mechanics Volume 51, Number 4, August25 2014 , pages 663-683 DOI: https://doi.org/10.12989/sem.2014.51.4.663 |
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Experimental study on high gravity dam strengthened with reinforcement for seismic resistance on shaking table |
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Mingming Wang, Jianyun Chen, Shuli Fan and Shaolan Lv
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| Abstract | ||
| In order to study the dynamic failure mechanism and aseismic measure for high concrete gravity dam under earthquake, the comparative models experiment on the shaking table was conducted to investigate the dynamic damage response of concrete gravity dam with and without the presence of reinforcement and evaluate the effectiveness of the strengthening measure. A new model concrete was proposed and applied for maintaining similitude with the prototype. A kind of extra fine wires as a substitute for rebar was embedded in four-points bending specimens of the model concrete to make of reinforced model concrete. The simulation of reinforcement concrete of the weak zones of high dam by the reinforced model concrete meets the similitude requirements. A tank filled with water is mounted at the upstream of the dam models to simulate the reservoir. The Peak Ground Acceleration (PGA) that induces the first tensile crack at the head of dam is applied as the basic index for estimating the overload capacity of high concrete dams. For the two model dams with and without strengthening tested, vulnerable parts of them are the necks near the crests. The results also indicate that the reinforcement is beneficial for improving the seismicresistant capacity of the gravity dam. | ||
| Key Words | ||
| similitude relationship; seismic measure; model test; reinforced bar; shaking table | ||
| Address | ||
| Mingming Wang : Faculty of Electric Power Engineering, Kunming University of Science and Technology, No. 727 South Jingming Road, Chenggong District, Kunming, P.R. China Jianyun Chen, Shuli Fan and Shaolan Lv : State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, Liaoning Province, P.R. China | ||