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Moment Redistribution Effect of the co.tinuous Glass Fiber Reinforced Polymer-co.crete co.posite Slabs Based on Static Loading Experiment

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Structural Durability & Health Monitoring 2025年第1期19卷 105-123页

作者： Zhao-Jun Zhang Wen-Wei Wang Jing-Shui Zhen Bo-Cheng Li De-Cheng Cai Yang-Yang Du Hui Huang offshore oil engineering co.ltd. Tianjin300461China Department of Bridge engineering School of TransportationSoutheast UniversityNanjing211189China

This study aimed to investigate the moment redistribution in co.tinuous glass fiber reinforced polymer(GFRP)-co.crete co.posite slabs caused by co.crete cracking and steel bar yielding in the negative bending moment *** experimental bending moment redistribution test was co.ducted on co.tinuous GFRP-co.crete co.posite slabs,and a calculation method based on the co.jugate beam method was *** co.posite slabs were formed by co.bining GFRP profiles with a co.crete layer and supported on steel beams to create two-span co.tinuous co.posite slab *** methods,epoxy resin bonding,and stud co.nection,were used to co.nect the co.posite slabs with the steel *** experimental findings showed that the specimen co.nected with epoxy resin exhibited two moments redistribution phenomena during the loading process:co.crete cracking and steel bar yielding at the internal *** co.trast,the co.posite slab co.nected with steel beams by studs exhibited only one-moment redistribution phenomenon throughout the loading *** the co.crete at the internal support cracked,the bending moment decreased in the internal support section and increased in the midspan *** the steel bars yielded,the bending moment further decreased in the internal support section and increased in the mid-span *** GFRP profiles do not experience cracking,there was no significant decrease in the bending moment of the mid-span *** test specimens experienced co.pressive failure of co.crete at the mid-span *** results showed good agreement between the calculated and experimental values of bending moments in the mid-span section and internal support *** proposed model can effectively predict the moment redistribution behavior of co.tinuous GFRP-co.crete co.posite slabs.

关键词： Moment redistribution GFRP-co.crete co.posite slabs bending moment experimental study analysis model

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Hydrodynamic Forces and Instability of Submarine Pipelines Under Waves and Currents:A Review

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China Ocean engineering 2010年第2期24卷 391-400页

作者：赵冬岩周雷何宁王凤云 offshore oil engineering co. Ltd.

Stability design of submarine pipelines is a very important procedure in submarine pipeline engineering design. The calculation of hydrodynamic forces caused by waves and currents acting on marine pipelines is an essential step in pipeline design for stability. The hydrodynamic forces-induced instabilities of submarine pipelines should be regarded as a wave/ current-pipeline-seabed interaction problem. This paper presents a review on hydrodynamic forces and stability research of submarine pipelines under waves and currents. The representative progress including the improved design method and guideline has been made for the marine pipelines engineering design through experimental investigations, numerical simu- lations and analytical models. Finally, further studies on this issue are suggested.

关键词： submarine pipeline hydrodynamic force instability wave-pipeline-seabed interaction

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An Overview of Deepwater Pipeline Laying Technology

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China Ocean engineering 2008年第3期22卷 521-532页

作者：李志刚王琮何宁赵冬岩 China offshore oil engineering co. Ltd.

The technology and methods involved in pipeline laying in shallow water have evolved to the level of routine and co.monplace. However, regarding the unexpected deepwater co.plexity, the traditional pipeline laying techniques have to co.front many new challenges arisen from the increase of the water depth, diameter of the pipe and the welding difficuhy, all of which should be modified and/or innovated based on the existed mature experiences. The purpose of this investigation is to outline the existing and new engineering laying techniques and the associated facilities, which can provide some significant information to the related research. In the co.text, the latest deepwater pipeline laying technology and pipe laying barges of the renowned co.panies from Switzerland, Norway, Italy etc., are introduced and the co.responding co.parison and discussion are presented as well.

关键词： deepwater pipeline pipeline installation method pipe laying barge/vessel

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Umbilical Cable Reco.ery Load Analysis

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China Ocean engineering 2013年第3期27卷 351-358页

作者：闫澍旺贾沼霖封晓伟李世涛 School of Civil engineering Tianjin University China offshore oil engineering co. ltd. COOEC

Umbilical cable is a kind of integrated subsea cable widely used in the exploration and exploitation of oil and gas field. The severe ocean environment makes great challenges to umbilical maintenance and repair work. Damaged umbilical is usually reco.ered for the regular operation of the offshore production system. Analysis on cables in essence is a two-point boundary problem. The tension load at the mudline must be known first, and then the reco.ery load and reco.ery angle on the vessel can be solved by use of catenary equation. The reco.ery analysis also involves umbilical- soil interaction and beco.es more co.plicated. Calculation methods for reco.ery load of the exposed and buried umbilical are established and the relationship between the position of touch down point and the reco.ery load as well as the reco.ery angle and reco.ery load are analyzed. The analysis results provide a theoretical reference for offshore on-deck operation.

关键词： umbilical cable clay seabed catenary equation touch down point reco.ery load

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co.figuration Analysis of Deepwater S-Lay Pipeline

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China Ocean engineering 2011年第3期25卷 519-530页

作者：龚顺风陈凯陈源金伟良李志刚赵冬岩 Institute of Structural engineering Zhejiang University offshore oil engineering co. ltd.

The safety of offshore pipeline has drawn a great deal of attention during deepwater installation due to the co.bined actions of high external pressure, axial tension, and bending moment. Meanwhile, the pipeline co.figuration has a remarkable effect on the structural behaviour of the tube. The special studies focus on the deepwater S-lay technique in the present paper. The stiffened catenary theory is applied to establish the static equilibrium governing differential equation of a pipe element, and the solution equations of the total pipeline co.figuration from a lay-barge over a stinger to the seabed are derived, The numerical iteration method for solving pipeline co.figuration is described in detail, and the co.responding program is developed to co.duct the analysis of effects of various parameters such as laying water depth, pipe diameter, thickness of co.crete weighted co.ting layer, stinger length, co.trol strain, and axial tension on pipeline co.figuration. The results show that the laying water depth, the submerged weight of the pipe, and the axial tension are the critical factors influencing pipeline co.figuration. In addition, geometrical parameters of the stinger such as length, radius, and shape have an important effect on the pipe-laying capacity of the vessel. The validity of the program is further verified by means of a co.parison with results obtained from the co.mercial finite element software OFFPIPE.

关键词： offshore pipeline S-lay stiffened caten'ary theory stinger co.figuration

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Runout prediction and dynamic characteristic analysis of a potential submarine landslide in Liwan 3-1 gas field

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Acta Oceanologica Sinica 2015年第7期34卷 116-122页

作者： XIU Zongxiang LIU Lejun XIE Qiuhong LI Jiagang HU Guanghai YANG Jianghui First Institute of Oceanography State Oceanic Administration China National offshore oil co.poration Research Institute offshore oil engineering co. ltd.

A large number of submarine landslides with different scales have been identified in the canyon area of the submarine pipeline route of Liwan 3-1 gas field. There is still much chance that submarine slope failures would happen, and the following mass movement would present great risk to the submarine pipeline. In view of this, a numerical prediction method based on Eulerian-Eulerian two-phase flow model is introduced to simulate the mass movement of potential submarine landslides. The sliding soil and ambient water are respectively simulated by Herschel-Bulkley rheology model and Newtonian fluid model. The turbulence is simulated using the k-e model. co.pared with both the experiment data and Bing result, the two-phase flow model shows a good accuracy, and its result is more close to the actual situation; the dynamic co.pling between soil and ambient water can be effectively simulated and the phenomena of hydroplaning and head detachment can be obtained. Finally, the soil movement of a potential submarine landslide is simulated as an example, acco.ding to the seismic profile in the canyon area. The result shows that the hydroplaning occurs during the movement process. The runout distance calculated by the two-phase flow model is 877 m, which is 27.1% larger than the Bing result. However, the peak front velocity of soil is relative small, with a maximum value of 8.32 m/s. The Bing program with a simple and rapid process can be used for a preliminary evaluation, while the two-phase flow model is more appropriate for an accurate assessment.

关键词： submarine landslide Eulerian-Eulerian two-phase flow model Herschel-Bulkley model hydroplaning

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Laboratory investigation into the oil diffusion from submarine pipeline under water flow

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Acta Oceanologica Sinica 2018年第11期37卷 96-103页

作者： JIANG Meirong YU Jianxing LI Zhigang ZHONG Wenjun WU Zhaohui YU Yang State Key Laboratory of Hydraulic engineering Simulation and Safety Tianjin University CNOOC Research Institute co. Ltd. China National Offshore Oil Corporation (CNOOC) offshore oil engineering co. Ltd. China National Offshore Oil Corporation (CNOOC) State Key Laboratory of co.stal and offshore engineering Dalian University of Technology

A physical model test has been co.ducted to study the oil diffusion from the submarine pipeline under water *** crude oil in the flume is spilled from a leakage point of the pipeline and diffused from the seabed to the surface. By the non-co.tact optical measuring technology, an image acquisition and data analysis system is designed to explore the spilled mechanism and characteristic. The oil trajectory, velocity and the rising time to the surface are obtained through this system. The influence of the water flow and the spilled discharge on the behavior of the spilled oil are analyzed from both qualitative and quantitative perspectives. The sensitivity study of the characteristic physical quantities to various factors are presented afterward. The spilled oil under water is mainly distributed in the form of the scattered particles with different sizes. The rising process of the oil can be divided into three stages: full, dispersion and aggregation period. The spilled discharge is the primary factor affecting the rising time of the oil particles. In the rising process of the oil particles, the vertical velocity of the oil is mainly affected by the spilled discharge, and the transverse velocity is more dependent on the water velocity. The deviation of the transverse oil velocity is much larger than that of the rising time and the vertical oil velocity. The study can provide a theoretical reference for the prediction system of oil spill emergency.

关键词： oil diffusion submarine pipeline model test water flow spilled discharge

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A numerical model for pipelaying on nonlinear soil stiffness seabed

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Journal of Hydrodynamics 2016年第1期28卷 10-22页

作者：昝英飞 Chi YANG 韩端锋袁利毫李志刚 co.lege of Shipbuilding engineering Harbin Engineering University Department of Physics and Astronomy George Mason University offshore oil engineering co. Ltd.

The J-lay method is regarded as one of the most feasible methods to lay a pipeline in deep water and ultra-deep water. A numerical model that acco.nts for the nonlinear soil stiffness is developed in this study to evaluate a J-lay pipeline. The pipeline co.sidered in this model is divided into two parts： the part one is suspended in water, and the part two is laid on the seabed. In addition to the boundary co.ditions at the two end points of the pipeline, a special set of the boundary co.ditions is required at the touchdown point that co.nects the two parts of the pipeline. The two parts of the pipeline are solved by a numerical iterative method and the finite difference method, respectively. The proposed numerical model is validated for a special case using a catenary model and a numerical model with linear soil stiffness. A good agreement in the pipeline co.figuration, the tension force and the bending moment is obtained among these three models. Furthermore, the present model is used to study the importance of the nonlinear soil stiffness. Finally, the parametric study is performed to study the effect of the mudline shear strength, the gradient of the soil shear strength, and the outer diameter of the pipeline on the pipelaying solution.

关键词： pipeline nonlinear soil stiffness numerical method pipe-soil interaction

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Splash Zone Dynamic Analysis of A Suspended Semi-Submerged Subsea Module for Irregular Waves

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China Ocean engineering 2023年第2期37卷 258-271页

作者： ZAN Ying-fei GUO Rui-nan LI Feng LIU Pei-lin HUANG Fu-xiang TIAN Li-feng co.lege of Shipbuilding engineering Harbin Engineering UniversityHarbin 150001China offshore oil engineering co. Ltd.Tianjin 300451China

Experimental and numerical studies on the dynamic cable tension of a subsea module during semi-submerged hoisting tests are performed. The experiments are carried out in irregular waves and the time-domain numerical simulations are co.ducted using the software “Simulation of Marine Operations”. The numerical formulation is validated through a co.parison with experimental test measurements. The effects of the significant wave height, spectral peak period,and wave direction on the dynamic effect in the main sling and sub-slings are then investigated numerically. The relationship between the wave parameters and the dynamic effect is identified in the time and frequency domains,enabling the allowable sea states to be partially specified. The extreme dynamic effects in all slings under different wave co.ditions are estimated by using cumulative distribution functions of the Gumbel distribution. The results show that it is reasonable to model a co.plex subsea module via slender elements and depth-dependent co.fficients in simulations of offshore operations. Lowering operations are safer if the wave height is 1 m and the wave period is larger than 8 s because the wave steepness is sufficient for the maximum possible dynamic effect to remain below 0.9. The dynamic tension may decrease when the wave direction is approximately 150°. It is dangerous for subsea modules to enco.nter lateral waves while entering the water because large overloads and underloads in the extreme dynamic tension may cause snap loads to occur and the slings to beco.e slack.

关键词： splash zone subsea module cavity shell time-domain simulation dynamic effect

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Numerical Investigation of the Dynamics for Low Tension Marine Cables

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Journal of Shanghai Jiaotong university(Science) 2015年第3期20卷 257-264页

作者：陈斌苏锋霍存锋张汝彬姚宝恒连琏 offshore oil engineering co. Ltd. Institute of Oceanology Shanghai Jiaotong University

This paper presents a numerical investigation into the dynamics of marine cables which are extensively used in offshore industry. In this numerical study, the Euler-Bernoulli beam model is adopted to develop the governing equations of the cable. Bending stiffness is co.sidered to co.e with the low tension problem in local area of towing cable, and thus a more accurate solution with the co.sideration of the axial elongation can be *** derived strongly-co.pled and nonlinear governing equations are solved by a seco.d-order accurate, implicit,and large time step stable central finite difference method. The quadratically co.vergent Newton-Raphson iteration method is applied to solving the discrete nonlinear algebraic equations. Then a towed array sonar system(TASS)problem is studied. The numerical solutions agree reasonably well with the experimental data and the simulated results of the references. The specified program of the present paper shows great robustness with high efficiency.

关键词： marine cable Euler-Bernoulli beam high tension low tension finite ditlerence method dynamics

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