Seismic damage-cracking analysis of arch dams using different earthquake input mechanisms
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In this study, a nonlinear model is presented for analysis of damage-cracking behavior in arch dams during strong earthquakes using different seismic input mechanisms. The nonlinear system includes a plastic-damage model for cyclic loading of concrete considering strain softening and a contact boundary model of contraction joint opening. Two different earthquake input mechanisms are used for comparison, including massless foundation input model and viscous-spring boundary model considering radiation damping due to infinite canyon. The results demonstrate that effects of seismic input mechanism and radiation damping on nonlinear response and damage-cracking of the dam are significant. Compared with the results of using massless foundation input model, the damage-cracking region and contraction joint opening are substantially reduced when using viscous-spring boundary model to take into account radiation damping. However, if the damping ratio of the dam is artificially increased to about 10%–15% for massless foundation input model, the joint opening and damage-cracking of the dam are comparable to the results obtained from the viscous-spring boundary model.
Keywordsearthquake input mechanism damage-cracking radiation damping contraction joints arch dam
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- 1.Zhang C H. Challenges of high dam construction to computational mechanics. 6th WCCM, Beijing, 2004Google Scholar
- 2.Clough R W. Non-linear mechanisms in the seismic response of arch dams. Proc Int Res Conf Earthquake Eng, Skopje, 1980. 669–684Google Scholar
- 3.Fenves G L, Mojtahedi S, Reimer R B. ADAP88: a computer program for nonlinear earthquake analysis of concrete arch dams. Report No. EERC 89-12, Earthquake Engineering Research Center. Berkeley: University of California, 1989Google Scholar
- 5.Zhang C H, Xu Y J, Jin F. Effects of Soil-Structure Interaction on Nonlinear Response of Arch Dams. Beijing: International Academic Publishers, 1997. 95–114Google Scholar
- 7.Chen H Q. Model test and program verification on dynamic behavior of arch dam with contraction joints. Report No. SVL-94/2 IWHR, 1994Google Scholar
- 13.Bazant Z P, Oh B H. Crack band theory for fracture of concrete. Mat Struct, 1983, 16(93): 155–177Google Scholar
- 20.Lysmer J, Kuhlemeyer R L. Finite dynamic model for infinite media. J Eng Mech Division (ASCE), 1969, 95(3): 759–877Google Scholar
- 23.Liu J B, Lu Y D. A direct method for analysis of dynamic soil- structure interaction based on interface idea. In: Zhang C H, Wolf J P, eds. Dynamic Soil-Structure Interaction—Current Research in China and Switzerland. Beijing: International Academic Publishers, 1997. 258–273Google Scholar
- 24.Sánchez-Sesma F J. Diffraction of elastic waves by three-dimensional surface irregularities. Bull Seism Soc Am, 1983, 73(8): 1621–1636Google Scholar