DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

EXPERIMENTAL STUDY OF WAVE FLOWS AROUND THE FINITE LENGTH VERTICAL WALL

Vestnik MGSU 7/2012
  • Tran Long Giang - Moscow State University of Civil Engineering (MSUCE) postgraduate student, Department of Hydraulic Engineering, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Kantarzhi Igor' Grigor'evich - Moscow State University of Civil Engineering (MSUCE) Doctor of Technical Sciences, Professor, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Zuev Nikolay Dmitrievich - Moscow State University of Civil Engineering (MSUCE) Candidate of Technical Sciences, Project Manager, Marine Research Laboratory, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Shun'ko Natal'ya Vladimirovna - Moscow State University of Civil Engineering (MSUCE) Director, Marine Research Laboratory, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 101 - 108

Construction of breakwater structures of modern seaports requires computational models describing interaction of waves with structural elements of ports. The model should be based on numerical hydrodynamic models that contemplate all constituents of interaction between waves and structures, including those at various stages of construction. The above model makes it possible to have construction works performed in accordance with the pre-developed plan. Experimentalresearch of the behaviour of breakwater structures is to be conducted in laboratories. A scaled natural model is to be used for the above purpose to verify the model behaviour. The authors consider the methodology and results of experiments involving models of wave loads produced on vertical breakwater structures at various stages of their construction.
On the basis of the experiments conducted by the authors, it is discovered that the value of the total wave force, that the vertical wall is exposed to, increases along with the wall length in the event of a constant wave mode, which is natural. However, the per-meter value of the wave force increases along with the increase in the length of the wall until it reaches the value of the length of a transverse obstacle divided by the length of waves equal to 0.28; thereafter, the wave force goes down. The authors assume that this phenomenon is caused by the change in the nature of interaction between waves and an obstacle and a transition from a diffraction-free flow to a diffraction flow. The authors believe that further researches are necessary to explore the phenomenon.

DOI: 10.22227/1997-0935.2012.7.101 - 108

References
  1. SNiP 2.06.04—82*. Nagruzki i vozdeystviya na gidrotekhnicheskie sooruzhenya (volnovye, ledovye i ot sudov) [Construction Norms and Rules 2.06.04—82*. Loads and Actions on Hydraulic Structures (Waves, Ice and Vessels). GOSSTROY SSSR [State Committee for Construction] Publ., Moscow, 1989.
  2. Weggel J.R., Maxwell W.H. Numerical Model for Wave Pressure Distributions. Proc. ASCE, J. Waterw. Harbors Coastal Eng. Div, 1970, WW3: 623—642.
  3. U.S. Army Corps of Engineers. Coastal Engineering Manual (CEM), 2006, Veri-Tech, Inc., Washington, DC.
  4. Minikin R.R. Winds, Waves and Maritime Structures. Charles Griffin, 1950, London.
  5. Tran L.G. and Kantardgi I.G. Volnovye nagruzki i ustoychivost’ ekraniruyushchey stenki portovogo mola v period stroitel’stva [Wave Load and Stability of the Port Mole Wall in the Period of Construction]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 5, pp. 48—53.
  6. Hattori M., Arami A., and Yui T. Wave Impact Pressure on Vertical Walls under Breaking Waves of Various Types. Coastal Eng, 1994, vol. 22, pp. 79—114.
  7. Tran L.G. and Kantardgi I.G. Numerical Study of the Wave Load on the Reflecting Wall of the Port Mole at the Construction Stage. European Researcher Publ., 2011, no. 5—1(7).
  8. Lappo D.D., Strekalov S.S., Zav’yalov V.K. Nagruzki i vozdeystviya vetrovykh voln na gidrotekhnicheskie sooruzheniya [Loads and Actions of Wind Waves Produced on Hydraulic Structures]. Leningrad, VNIIG Publ., 1990.
  9. Peregrine D.H. Water-wave Impact on Walls. Annu. J. Rev. Fluid Mech, 2003, vol. 35, pp. 23—43.
  10. Shakhin V.M., Shakhina T.V. Metod rascheta difraktsii i refraktsii voln [Method of Analysis of Diffraction and Refraction of Waves]. Okeanologiya Publ., 2001, vol. 41, no. 5, pp. 674—679.
  11. Brebbia C. A., Walker S. Dinamika morskikh sooruzheniy [Dynamic Analysis of Offshore Structures]. Leningrad, Sudostroenie Publ., 1983.
  12. Kirkg?z M.S. An Experimental Investigation of a Vertical Wall Response to Breaking Wave Impact. Ocean Eng, 1990, vol. 17(4), pp. 379—391.
  13. Blackmore P.A., Hewson P.J. Experiments on Full Scale Wave Impact Pressures. Coastal Eng, 1984, vol. 8, pp. 331—346.
  14. Tlyavlin R.M. Pronitsaemye volnogasyashchie gidrotekhnicheskie sooruzheniya v zhestkom karkase [Permeable Wave Cancelling Hydraulic Structures That Have Rigid Frames]. Sochi, 2006, 153 p.

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EXPERIMENTAL STUDY OF THE BEARING CAPACITY OF SPATIAL METAL FRAMES

Vestnik MGSU 5/2012
  • Serpik Igor' Naftol'evich - Bryansk State Technological Academy of Engineering Doctor of Technical Sciences, Professor, Chair, Department of Mechanics, Bryansk State Technological Academy of Engineering, 3 Stanke Dimitrov Prospect, Bryansk, 241037, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Alekseytsev Anatoliy Viktorovich - Bryansk State Technological University of Engineering (BSTU) Candidate of Technical Sciences, Associate Professor, Department of Construction Operations, Bryansk State Technological University of Engineering (BSTU), 3 prospekt Stanke Dimitrova, Bryansk, 241037, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 40 - 44

In the article, the authors describe the principal findings of the experimental study of destruction of spatial frames made of closed-profile steel rods. Six samples of frames were tested through the application of a kinematic loading scheme. Values of forces, displacements and deformations were measured over the time. Each sample was brought to the state when the load reached its maximal value. Thereafter, the load intensity was reduced to 0.6...0.7 of its maximal value. It was identified that the destruction of rods in the event of combined stress was similar to the formation of plastic hinges in the course of regular bending. In some cases, cracks were formed in the zones of plastic hinges. This process did not cause complete destruction of frames.
Destruction-related conditions were also assessed by the quasi-rigidity method implemented in STARK ES 2009 software package. The input data were used to perform failure, bending and torsion tests of steel pipes. The experiments and calculations have proven that in this case the process of destruction can be considered in accordance with the limit equilibrium method by taking account of formation of spatial plastic hinges. The quasi-rigidity method can be employed to identify the maximal load that the frames can bear.

DOI: 10.22227/1997-0935.2012.5.40 - 44

References
  1. János L. Optimal Limit Design of Elasto-Plastic Structures for Time-Dependent Loading. Structural Multidisciplinary Optimization. 2007, vol. 33, pp. 269—273.
  2. Bower A.F. Applied Mechanics of Solids. New York, CRC Press, 2009, 794 р.
  3. Tin-Loi F. Plastic Limit Analysis of Flat Frames and Grids Using GAMS. Computers and Structures. 1995, vol. 54, pp. 15—25.
  4. Rutman Yu.L., Semenov V.A., Lebedev V.L. Primenenie metoda psevdozhestkostey dlya analiza predel’nykh sostoyaniy konstruktsiy [Application of the Method of Pseudo-stiffness in the Analysis of Limit States of Structures]. Stroitel’naya mekhanika i raschet sooruzheniy [Structural Mechanics and Analysis of Structures]. 2007, no. 6, pp. 68—72.
  5. Serpik I.N., Alekseytsev A.V. Raschet prostranstvennykh sterzhnevykh sistem metodom predel’nogo ravnovesiya [Calculation of Spacial Rod Systems by the Limit Equilibrium Method]. Matematicheskoe modelirovanie v mekhanike deformiruemykh tel i konstruktsiy. Metody granichnykh i konechnykh elementov. [Mathematical Modeling in Mechanics of Solids and Structures. Methods of Boundary and Finite Elements]. Proceedings of the 27th International Conference. St.Petersburg, SPBGASU [St.Petersburg State University of Architecture and Civil Engineering]. 2011, pp. 104.
  6. Serpik I.N., Alekseytsev A.V., Gusakov A.N. Ustanovka dlya ispytaniy na izgib s krucheniem sterzhnevykh obraztsov. [Stand for Bending and Torsion Testing of Sample Rods]. Pat. 2406992, RF, MPK G01N 3/20 Bull. no. 35 of 20.12.2010, 4 p.
  7. Serpik I.N., Alekseytsev A.V., Gusakov A.N. Eksperimental’no-teoreticheskie issledovaniya protsessa obrazovaniya plasticheskikh sharnirov v sterzhnyakh korobchatogo secheniya pri slozhnom soprotivlenii [Experimental and Theoretical Study of the Process of Formation of Plastic Hinges in Box Section Rods in the event of Combined Stress]. Traditsii i innovatsii v stroitel’stve [Traditions and Innovations in construction]. Proceedings of the 67th All-Russian Scientific and Technical Conference. Samara, SGASU [Samara State University of Architecture and Civil Engineering]. 2010, pp. 131—133.

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