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101.
Analysis of Wave Height in Front of a Wave Absorbing Structure with Rubble Foundation 总被引:1,自引:0,他引:1
Li Rongqing Xie Shileng Engineer The First Design Institute of Navigation Engineering The Ministry of Communications Tianjin Professor Senior Engineer Deputy Chief Engineer The First Design Institute of Navigation Engineering The Ministry of Communications Tianjin 《中国海洋工程》1992,(3)
Wave absorbing structures have been widely applied in many countries. In the present paper, the wave heights in front of a vertical wave absorbing structure with rubble foundation as well as in the wave chamber of the structure are analysed using an approximative calculation method, and the dissipating effect of the structure is verified. On the basis of the results of regular waves, the relative wave heights of irregular waves in front of the wave absorbing structure as well as in the chamber have also been analysed. 相似文献
102.
Song Yupu Zhao Guofan Peng Fang Shen Jina Doctor Professor Dalian University of Technology Dalian .
Professor Dalian University of Technology Dalian
Doctor Dalian University of Technology Dalian Engineer Dalian University of Technology Dalian 《中国海洋工程》1996,(2)
The strength of lightweight concrete under triaxial compressive stress is studied experimentally with the concrete triaxial apparatus designed by the authors, and is compared with that of normal concrete under the same stress state. Ninety-five 100 mm cubes under twenty stress ratios are tested. As compared with normal concrete, it is found that not only the multiaxial compressive strength of lightweight concrete is small, but also the ratio of the multiaxial compressive strength to the uniaxial compressive strength is small. The influence of the intermediate principal stress on the multiaxial strength of lightweight concrete is discussed. The strength criteria which are expressed in the principal stresses and the octahedral stresses respectively are proposed. 相似文献
103.
Yan Shuwang Jia Xiaoli Deng Weidong
Professor Dept. of Hydraulic Eng. Tianjin University Tianjin
Graduate student Dept. of Hydraulic Eng. Tianjin University Tianjin
Senior Engineer Chongqing Institute of Highway Science 《中国海洋工程》1994,(4)
When using the random process in soil profile modeling, the stationary and ergodicity of thesoil properties in the profile must be tested. This paper describes a procedure for stationary and ergodicity testing. Numerical examples were given for demonstration. A log-cosine function is suggested to simulate the correlation function, which has been proved to be good for soil profile modeling. 相似文献
104.
Zhong Wanxie Yao Shizhong Wu Lianyuan Xi Deyin Professor Shanghai Jiao Tong University Shanghai Engineer Shanghai Jiao Tong University Shanghai Lecturer Shanghai Jiao Tong University. Shanghai 《中国海洋工程》1993,(4)
- In this paper, the authors use the finite element method to conduct a special static analysis for the loadout procedure of offshore structures. By introducing a variable Xmove (the distance between the relative coordinate system fixed in the moving upper structure and the absolute coordinate system fixed on slideway), adopting substructure to treat the upper structure, and using the elastic foundation beam to model the slideway, the model for the analysis of the loadoul procedure is established. On the basis of this model, DASOS-J loadout program, a program system for the static analysis of loadout offshore structures, is also developed. 相似文献
105.
Kuang Cuiping
Ph. Doctor Senior Engineer River Harbour Engineering Department Nanjing Hydraulic Research Institute Nanjing 《中国海洋工程》1997,(3)
The importance of computational grids in hydraulic numerical models is studied by numericalsimulation of jet flow in a rectangular duct which is linked with a fixed width inlet and a different widthoutlet using a standard k-ε turbulence model.The computational results show the numerical solutionsmay not be reasonable because of the incorrect computational grid and each numerical model has a grid-in-dependent solution.The computational grid has a definitive effect on the accuracy and stability of thecomputational solution,which must be divided well according to the simulated geometry and physicalcharacters of hydraulic problems.The main guidelines about the formation of computational grid in suchaspects as node distribution,smoothness and skewness of grid,have been given. 相似文献
106.
Gao Renliang Huang Chengkui Yang Guoxian Associate Professor Dalian University of Technology Dalian Senior Engineer Dalian University of Technology Dalian Professor Dalian University of Technology Dalian 《中国海洋工程》1993,(2)
This paper introduces the process and result of fatigue test of steel (Z direction steel) welded T tubular joints used in offshore engineering. Detailed measurement of stress concentration factor, stress distribution, fatigue life and crack development has been performed. Through analysis, an empirical formula of stress concentration factor for T tubular joints, fatigue S-N curve and crack propagation rule are obtained. 相似文献
107.
Chu Liangcheng Qu Naisi Guo Yonggang Lu Min Ph.D. Dalian University of Technology Dalian
Associate Professor Dalian University of Technology Dalian
Assistant M.S. Dalian University of Technology Dalian
Engineer Bohai Oil Company Tianjin 《中国海洋工程》1993,(4)
- Theoretically speaking, it is impossible to make the differential equation of motion uncoupled for the natural modes of a system in consideration of the attached water. The hydro-elastic structure is equal to the, non-proportional damping system. In this paper a perturbation analysis method is put forward. The structure motion equation is strictly solved mathematically, and the non-proportional damping problem is transformed into a series of proportional damping ones in the superposition form. The paper also presents the calculation formula of the dyanamic response of the structure being subjected to harmonic and arbitrary load. The convergence of the proposed method is also studied in this paper, and the corresponding convergence conditions are given. Finally, the proposed method is used to analyze the displacement response of a real offshore platform. The calculation results show that this method has the characteristics of high accuracy and fast convergence. 相似文献
108.
109.
Volker SPORK. Research Engineer Institute of Hydraulic Engineering Water Resources Management Aachen University of Technology Kreuzherrenstrasse D- Aachen Germany Joachim JAHNKE Senior Researcher Institute of Botany Aachen University of 《国际泥沙研究》1997,(3)
I.INTRODUCTIONMOrphologicalprocessesinlotvlandriversaredond~actransportphenomenaoffineandcohesivesediments.AsthismaterialtendstobindtoxicagentsandthuSrepresentsapotentialdangerfortheaqUaticenvironmentitisofspotalinterestintennsOfwaterqualityinvestigations.BesidesthisapeOfenvironmentalprotectionfinesedimentsoftendepositinnavigationchannelsandimpedeshipping.implyingextensiveandexpensitredredging.Thesereasonsprot,e,thatthetranSPortbehal'iorOffinesedimentsshouldbeinvestigatedcarefullytogiv… 相似文献
110.
WAN Zhaohui Professor China Institute of Water Resources & Hydropower Research P.QBox Beijing China GAO Jianen Senior Engineer North-West Hydro-technical Science ReSearch Institute Yangling Shaangxi China ZHANG Anmin Director 《国际泥沙研究》1997,(3)
LIRRIGAnONALONGTHELOWERYELLOW~RYellowairisoneOfthemainwaterresourcesinNOrthChina.Sincetheames70diVersionslthees,28siphonsand30PUmpingstationshavebeenbuiltalongtheLowerYellowRad.Thetotaldischargingcapacityis3363m3lsacthetotalirrigationareaisnearlytwOInillinnh~s.Intheeighties,asanaVerage,Il.lxloom3ofwaterwasdiVertalfromtheYellowairannually.In198915.4-cio'm3ofwatCfwasdiVerted.AstheYdlowforerisaheavilysediment-ladenone,sedimentisdiVertedsimultalleouslywhenwaterisdiverted.Inthe… 相似文献