Determination of the dynamic coefficient under the tsunami bore impact on the protective structure of gravitational type
Abstract
In theoretical and experimental researches of loads from a collapsed wave on marine and coastal structures from tsunami dynamic effect due to the flexibility of the structure and the foundation was not taken. The generalized dependence of the resultant pressure waves of the collapsed wave (bore) from time was established based on the analysis of modern publications. The reaction of structures to the effects of bore depends of loading and stiffness of the system «soil-construction». Numerical evaluation of dynamic effects for different values of the loading rate and the stiffness of the system, for example, of protective breakwater are made. Various ground bases corresponding to possible conditions of construction are examined. As the analyses scheme of the building there was considered an absolutely rigid body on an elastic base with two degrees of freedom — displacement in the horizontal direction and rotation in the plane perpendicular to the axis of the pier. Self-oscillations corresponding to the lower mode taking into account the inertial effects of water are considered. From the results of the article, researches have shown that, when defining loads from the bore on the protection structure should take into account their dynamic nature. For a conservative evaluation in approximate calculations it is allowed to take the value of the dynamic factor equal to two.
About the Authors
Yu. L. RutmanRussian Federation
V. Yu. Filkov
Russian Federation
References
1. Robertson I. N., Carden L. P., Chock G. Y. K. Case Study of Tsunami Bore Impact on RC Wall. Proceedings of the 32nd International Conference on Ocean, Offshore and Arctic Engineering. OMAE 2013. June 9—14, 2013, Nantes, France. URL: https://www.researchgate.net/publication/267607620_Case_Study_of_Tsunami_Bore_Impact_on_RC_Wall (Accessed: 01.05.2017).
2. Robertson I. N., Riggs H. R., Mohamed A. Experimental results of tsunami bore forces on structures. Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering. OMAE 2008. June 15—20, 2008, Estoril, Portugal. URL: http://teri.hawaii.edu/pdf/OMAE2008Robertson.pdf (Accessed: 01.05.2017).
3. Wei Z., Dalrymple R. A., Hérault A., Bilotta G., Rustico E., Yeh H. SPH modeling of dynamic impact of tsunami bore on bridge piers. Coastal Engineering. 2015, 104, October 2015, 26—42. URL: http://peer.berkeley.edu/tsunami/wp-content/uploads/2015/11/1-s2.0-S0378383915001143-main.pdf (Accessed: 01.05.2017).
4. Palermo D., Nistor I. Understanding tsunami risk to structures: a Canadian perspective. The 14th World Conference on Earthquake Engineering. October 12—17, 2008, Beijing, China. URL: http://www.tsunamisociety.org/274PalermoNistor.pdf (Accessed: 01.05.2017).
5. Md Mostafizur Rahman, Eizo Nakaza. Experimental and numerical simulation of tsunami bore impact on a building. International Journal of Civil Engineering and Technology (IJCIET). 2016, 7, 4, July—August 2016, 13—23. URL: http://www.iaeme.com/MasterAdmin/UploadFolder/IJCIET_07_04_002-2/IJCIET_07_04_002-2.pdf (Ref. date: 01.05.2017).
6. Ashwin Lohithakshan Parambath. Impact of Tsunamis on Near Shore Wind Power Units. Texas.: A&M University, 2010. URL: https://www.flow3d.com/wp-content/uploads/2014/08/Impact-of-Tsunamis-on-Near-Shore-Wind-Power-Units.pdf (Accessed:01.05.2017).
7. Development of A Guideline for Estimating Tsunami Forces on Bridge Superstructures, Final Report SR 500-340. URL: https://ntl.bts.gov/lib/43000/43100/43110/TsunamiForces_SR500_342__2_.pdf (Accessed: 01.05.2017).
8. Kulmach P. P. Earthquake resistanсe of port hydraulic engineering constructions. Moscow, Transport, 1970. 312 p. (in Russian).
9. Kulmach P. P., Filippenok V. Z. Impact of a tsunami on sea hydraulic engineering constructions. Moscow, Transport, 1970. 312 p. (in Russian).
10. Shimanskiy Y. A. Dynamic analysis of ship structures. Leningrad, Sudpromgiz, 1963. 444 p. (in Russian).
Review
For citations:
Rutman Yu.L., Filkov V.Yu. Determination of the dynamic coefficient under the tsunami bore impact on the protective structure of gravitational type. Fundamental and Applied Hydrophysics. 2017;10(3):91-96. (In Russ.)