Probabilistic Analysis for Seismic Stability of Beach Earth Embankment     

He Guangne Yang Bin Professor  Dalian University of Technology  Dalian Engineer  Design  Research Institute of Shanghai Harbour Engineering  Shanghai 《中国海洋工程》1995,(4)

The current safety factor method for evaluating earth embankment stability is not very rational since the assessment of slope stability is really an uncertainty problem. In order to consider the random property of this problem, the probabilistic analysis is introduced herein. Finally, the stability of a real beach earth embankment is analysed by means of the suggested probabilitic approach. It may be seen that the results of analysis can represent the numerical assessment of the degree of seismic stability.  相似文献   

Study on First-Yield Collapse of Submarine Pipelines     

Zhang Wenge Li Dexiang Associate Professor  Dalian Railroad Institute  Dalian . Engineer  Dalian New Shipyard  Dalian 《中国海洋工程》1997,(4)

-The first-yield collapse of submarine pipelines with an initial out-of-roundness imperfection un-der combined bending and external pressure load is formulated by means of the Von.Mises yield criterion.The formula reduces to Timoshenko and Gere's expression in the case of external pressure load alone.Theinfluence curves of various parameters on the yield strength are presented,the collapse of submarinepipelines in a deep water region is numerically predicted,and the effect of pre-yield nonlinear bending onthe yield strength is also examined.  相似文献   

Analytical Crack Model for 2-D Reinforced Concrete Structures     

CHE  Yi 《中国海洋工程》2002,16(3):415-422

A two-dimensional smeared crack model for reinforced concrete members is presented. Special emphasis is placed on the bond between concrete and reinforcement as the main factor influencing tension stiffening in cracked reinforced concrete. With the derived tangential stress-strain equations for concrete in the direction perpendicular to the cracks, the constitutive relationship for cracked reinforced concrete is established. Experimental specimens have been analyzed with the analytical model, and the analytical and experimental results are found to be in good agreement.  相似文献   

Active Absorption Wave Maker System for Irregular Waves   总被引：2，自引：0，他引：2  

柳淑学  王先涛  李木国  郭美谊 《中国海洋工程》2003,17(2)

1 .IntroductionThephysicalmodeltestisoneofthemainmethodstostudyvariousproblemsassociatedwiththedesignofcoastalstructures .Thecommonlyusedwavemakeristhepiston typewavemaker .Becausethewavemakerishighlyreflective ,akeyproblemisthewavemultiplereflectionsbetweenthewavemakerandthetestedstructuresinthewaveflume .There reflectedwavesfromthewavemakerarespuriouswavesrelativetotheincidentwavestothestructures .Howtopreventthere reflectedwavesfromthewavemakerbecomesacriticalproblemforaccurateexperimental…  相似文献   

Numerical Simulation and Physical Simulation of Sea Wave Groups     

Yu Yuxiu  Gui Manhai Professor  Dept. of Civil Eng. Dalian University of Technology 《中国海洋工程》1996,(3)

- Based on field wave data, an empirical formula of wave envelope spectrum is given in this paper. Then the methods of both numerical and physical simulation of sea wave groups with the given spectrum and groupiness parameters are suggested.  相似文献   

Experimental Study of Hydrodynamic Loading on Submarine Composite Pipelines under the Action of Waves and Current     

Ma Liang  Wang Jinying Xing Zhizhuang Sun Shaoshu Professor  Dalian University  Dalian Senior Engineer  China Offshore Oil Engineering Co. 《中国海洋工程》1994,(2)

- This article is aimed at the experimental study of the hydrodynamic loading induced by waves and current acting on the JZ 20-2 submarine composite pipelines. The corresponding hydrodynamic coefficients obtained in this experimental study can be applied to engineering projects.  相似文献   

Oblique and Multi-Directional Random Wave Loads on Vertical Breakwaters   总被引：3，自引：1，他引：3  

俞聿修  李本霞  张宁川 《中国海洋工程》2003,17(2)

1 .IntroductionTraditionally ,thedesignofcoastalstructuresisbasedontheformulaedevelopedforhead onuni directionalwaves .However,wavesusuallyattackabreakwaterobliquely ,formingshort crestedwavesinfrontofthebreakwater.Ontheotherhand ,asthehumanactivityareaisspreading ,thewaterdepthattheconstructionsiteforbreakwatershasatendencytobecomelarge ,andsomebreakwatershavebeenconstructedinwaterareasdeeperthan 6 0minJapan (Tanimotoetal.,1 988) .Theseawaveismulti directionalandrandom ,especiallyindeepwater…  相似文献   

Fast Evaluation of Time-Domain Green Function for Finite Water Depth     

滕斌  韩凌  勾莹 《中国海洋工程》2003,17(3)

1 .IntroductionShipsrestrainedbycablesandfendersinfrontofdocksundergolargeamplitudenon harmonicmotionsinwaves.Forthiskindofnon harmonicproblem ,atime domainmethodmustbeapplied .LinandYue ( 1 990 )usedanintegralequationwiththetime domainGreenfunctionforinfinitewaterdepthtocomputetheshipmotionindeepwater.Butforthepresentproblem ,theintegralequationwiththetime domainGreenfunctionforfinitewaterdepthmustbeapplied .TheGreenfunctionisafieldwithacertainboundaryandinitialconditionsproducedbyasourceat…  相似文献   

Nonlinear Wave Force on Pier Group in Shallow Water     

Qiu Dahong  Zhou Yuanheng  Jia Ying Professor  Dept. of Civil Engineering  Dalian University of Technology  Dalian Lecturer  Dept. of Civil Engineering  Dalian University of Technology  Dalian 《中国海洋工程》1992,(1)

Based on the 1st order cnoidal wave theory, the wave diffraction around the pier group inshallow water is studied in this paper. The formulas for calculating the nonlinear wave forces are also presented here. In order to verify the theoretical results, model tests are conducted in the wave flume in The State Key Laboratory of Coastal and Offshore Engineering located in Dalian University of Technology. The range of the wave parameters in the experiments is characteristic wave period T g/d~(1/2) = 8.08- 22.86, characteristic wave height H/ d= 0.1 ~ 0.45. The results obtained from the experiments agree with the theoretical results quite well. It is shown that, in shallow water the nonlinear wave forces acting on a pier group are greater than those calculated by linear wave theory, the value of increment in wave force increases with the increases of the nonlinearity of the wave. In the wave range studied in this paper, the nonlinear wave force can reach over 4 times the force calculatecd by linear wave theory. Thus, it is suggested that, when Tg / d~(1/2)> 8, the wave force on the piers in the pier group in shallow water should be calculated by using the cnoidal wave theory.  相似文献   

Wave Breaker Indices in Finite Water Depth   总被引：2，自引：0，他引：2  

Li Yucheng  Dong Guohai Teng Bin Professor  Civil Engineering Department  Dalian University of Technology  Dalian Ph. D. Student  Dalian University of Technology  Dalian Research Assistant  Doctor of Engineering  Dalian University of Technology  Dalian 《中国海洋工程》1991,(1)

Based on the analysis and comparison of wave breaker indices defined by geometric, kinetic as well as dynamic stabilities and verified by observation, the value a, which is equal to H / Lthkd by Miche's result and may be modified by Goda's results, is" suggested as the wave breaking criteria. The applicable values of a for pure waves or wave-current co-existing field are given in this paper. They are smaller than Miche's result (0.142), and they have been verified by model tests.  相似文献