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| 1 | Seismic failure mode improvement of RC frame structure based on multiple lateral load patterns of pushover analyses显示文摘The structural failure under severe ground motions is primarily caused by their unreasonable seismic failure mode (SFM). This paper provides a methodology aiming at the SFM improvement of reinforced concrete frame structure. An RC frame is modeled and three types of failure criterion are defined as the premise of SFM. Static pushover analysis is adopted to identify the SFM. The dominant failure modes and failure paths of the structure are obtained in three lateral load patterns (inverted trian- gular distribution, uniform distribution and adaptive distribution). Based on the pushover analysis, the sequential failure of components and the probability of the occurrence of plastic hinges are determined. By this, weak components of the structure are detected and herein are strengthened. The project cost of the proposed strengthening strategy increases by 2.4%. Capacity spectrum method is used to study the performance of the strengthening structure. Pushover analysis is conducted again to present the improvement of strength and ductility. Lateral drift and local response through IDA are also studied to indicate that the strengthening of some columns and beams can improve the SFM to enhance the seismic capacity of structure. | BAI JiuLin OU JinPing | 2011 | Science China(Technological Sciences)2011，54，11： | 14 |
| 2 | BEHAVIOR OF AIR-ENTRAINED CONCRETE AFTER FREEZE-THAW CYCLES显示文摘The experimental study of air-entrained concrete specimens subjected to different cycles of freeze-thaw was completed.The dynamic modulus of elasticity,weight loss,the cubic compressive strength,compressive strength,tensile strength and cleavage strength of air-entrained concrete were measured after 0,100,200,300,400 cycles of freeze-thaw.The experimental results showed that the dynamic modulus of elasticity and strength decreased as the freeze-thaw was repeated.The inffuences of freeze-thaw cycles on the mechanical properties,the dynamic modulus of elasticity and weight loss were analyzed according to the experimental results.It can serve as a reference for the maintenance,design and the life prediction of dams,hydraulic structures,offshore structures,concrete roads and bridges in northern cold regions. | Huaishuai Shang Yupu Song Jinping Ou | 2009 | Acta Mechanica Solida Sinica2009，22，3： | 11 |
| 3 | BP-PSO-based intelligent case retrieval method for high-rise structural form selection显示文摘Modern architectures are developing in the direction of tall buildings and complex structures,and the theoretical analysis and the design experience have seriously lagged behind the construction of super high-rise structures.Structural form selection,especially the case based reasoning (CBR) based structural form selection,is a promising tool for the construction of high-rise structures.In view of the limit of cognitive ability of domain experts,a BP (back propagation)-PSO (particle swarm optimization)-based intelligence case retrieval method for high-rise structural form selection is proposed.The CBR-based case retrieval method and the construction of the BP-PSO neutral network are introduced.And then the BP-PSO-based case retrieval method is validated by some engineering cases.The results of training and prediction indicate that the proposed method has good ability to retrieve the cases of high-rise structures. | ZHANG ShiHai OU JinPing | 2013 | Science China(Technological Sciences)2013，56，4： | 9 |
| 4 | Optimal sensor placement in health monitoring of suspension bridge显示文摘Structural health monitoring(SHM) provides an effective approach to ensure the safety of structures.However,with the restriction of the cost of sensor system and data processing,only a small number of sensors could be available in the health monitoring system(HMS).In order to obtain the best identification of structural characteristics,optimal sensor placement(OSP) becomes an inevitable task in the design of HMS.This paper introduces the process for determining the OSP in HMS of a suspension bridge,in which four different OSP methods have been investigated,including the effective independence(EI) method,the effective independence driving-point residue(EFI-DPR) method,the minimized modal assurance criterion(minMAC) method and the principal subset selection-based extended EI(PSS-EI) method.Then,three criteria,which are modal assurance matrix(MAC),condition number(CN) of mode shape matrix and determinant of Fisher information matrix(FIM),were employed to evaluate the effect of the OSP methods respectively.The result showed that the PSS-EI method developed has the ability to guarantee the highest determinant of FIM,a relatively small off-diagonal term of MAC and agreeable CN,as well as the deployment of sensors in a uniform and symmetric fashion for the studied bridge.Finally,the scheme obtained by PSS-EI was adopted in the HMS. | LI BinBin LI DongSheng ZHAO XueFeng OU JinPing | 2012 | Science China(Technological Sciences)2012，55，7： | 9 |
| 5 | Fatigue damage characterization of carbon fiber reinforced polymer bridge cables:Wavelet transform analysis for clustering acoustic emission data显示文摘Carbon fiber reinforced polymer(CFRP)has many remarkable merits.It is lightweight and has great rigidity and high intensity. High-durability cable produced from CFRP as reinforcement material is widely used in bridge construction projects.However, there is a dearth of studies regarding damage types and mechanism under fatigue load of CFRP bridge cables.In this paper,we adopt acoustic emission(AE)technology to monitor fatigue damage and failure of the CFRP bridge cables,specifically by monitoring the bridge cable’s fatigue test process and using wavelet transformation to analyze data.Results show that damage on the CFRP cable is divided into three stages.Based on wavelet singularity theory,in each stage of AE,the burst signal is obtained and its time-frequency distribution is achieved through wavelet analysis.According to the analysis results,failure modes in each phase and type of acoustic emission source are easy to determine.The characteristics of waveform,types of damages, and frequency distribution of CFRP bridge cable in different damage phases are collected.Research shows that the method used to determine the types of fatigue damage on the CFRP cable is feasible according to the range of distribution characteristic parameters for acoustic emission signal and type of waveform. | LI DongSheng HU Qian OU JinPing LI Hui | 2011 | Science China(Technological Sciences)2011，54，2： | 9 |
| 6 | Fiber damage analysis model for RC beam-column based on EEP super-convergent computation显示文摘A new numerical strategy to model nonlinear damage behavior of RC beam-column member based on level of material and superconvergent computation is presented in this paper. A fiber damage analysis model (FDAM) for RC beam-column member is established by analyzing section of fiber beam column element with the uniaxial damage constitutive relations of con-crete. The damage index of RC member through statistical analysis of concrete fibers damage is defined in the extreme section of beam elements, which can describe the nonlinear damage behavior of RC beam-column member under any loadings. The newly proposed element energy projection (EEP) method is applied to the inelastic analysis of FDAM. EEP superconvergent formulas for section forces and deformations of beam-column are established, and general algorithm and numerical strategy adopting EEP super-convergent computation for section deformation increment are proposed in the classical Newton-Raphson process. Both analysis and numerical test show that the EEP method can effectively find out the nonlinear feature of the distribution, and accurately obtain the damage distribution of RC beamcolumn. The proposed numerical scheme in this paper proves to be effective and convenient in its use and can be easily integrated into the present inelastic FEM programs of structure analysis. | TENG Jun LI ZuoHua OU JinPing HE XueFeng | 2011 | Science China(Technological Sciences)2011，54，10： | 6 |
| 7 | Design approaches for active,semi-active and passive control systems based on analysis of characteristics of active control force显示文摘In this paper,the characteristics of forces in active control systems connected to adjacent levels of a building are analyzed.The following characteristics are observed:(1) active control can provide signifi cantly superior supplemental damping to a building,but causes a small frequency shift;(2) the linear quadratic regulator(LQR)-based control force is composed of an elastic restoring force component and a damping force component,where the damping force is almost identical to the total control force,however,the elastic restoring force is very small;and(3) the active control forces prevent motion most of the time during the entire control process.These three characteristics imply that active control systems connected to adjacent levels of a building behave like passive damping devices with adjustable parameters,namely damping characteristics in an active control,which is the mechanism used by semi-active control devices to reach similar performance as active control systems.Two indices are defi ned to quantify the damping characteristics of control forces in active control systems.These two indices can also be used to quantify the capacity of semi-active control to achieve the performance of active control.Based on the above observations,two principles are founded for optimization of parameters of semi-active control devices and passive dampers.The fi rst is that the maximum output force of a semi-active or passive device to be designed is identical to an active device,called 'design principle'.The other is the response equivalent principle,which states that the response of a building with semi-active or passive devices is the same as with active devices when the same maximum output force is applied.The design procedure for semi-active control devices and passive dampers is described in detail.Finally,numerical simulations of two benchmark problems is conducted to demonstrate the damping characteristics of active control and investigate the capacity of semi-active control to achieve the same performance as active control. | Ou Jinping Li Hui | 2009 | Earthquake Engineering and Engineering Vibration2009，8，4： | 4 |
| 8 | Hydrodynamic Comparison of a Semi-submersible,TLP,and Spar:Numerical Study in the South China Sea Environment显示文摘The South China Sea contains tremendous oil and gas resources in deepwater areas. However, one of the keys for deepwater exploration, the investigation of deepwater floating platforms, is very inadequate. In this paper, the authors studied and compared the hydrodynamics and global motion behaviors of typical deepwater platforms in the South China Sea environment. The hydrodynamic models of three main types of floating platforms, e.g. the Semi-submersible, tension leg platform (TLP), and Truss Spar, which could potentially be utilized in the South China Sea, were established by using the 3-D potential theory. Additionally, some important considerations which significantly influence the hydrodynamics were given. The RAOs in frequency domains as well as global motions in time domains under time-varying wind, random waves, and current in 100-y, 10-y, and 1-y return period environment conditions were predicted, compared, and analyzed. The results indicate that the heave and especially the pitch motion of the TLP are favorable. The heave response of the Truss Spar is perfect and comparable with that of the TLP when the peak period of random waves is low. However, the pitch motion of Truss Spar is extraordinarily larger than that of Semi-submersible and TLP. | Binbin Li Kun Liu Gongwei Yan Jinping Ou | 2011 | Journal of Marine Science and Application2011，10，3： | 4 |
| 9 | Pressure distributions on prism-shaped buildings in experimentally simulated downburst显示文摘Wind loading is one of the most significant factors in civil engineering that influences the structural design considerably.In this paper,a group of manufacturing equipments for downburst simulation based on impinging jet model was developed for investigating the wind loads on structures:including the centrifugal air bellows to generate airflow,a movable platform to realize multiple locations of the building and a freely rotatable turntable to implement alterable building angles.Hundreds of transducers were used to measure the wind action on all surfaces of the building.The pressure coefficients calculated from the observed data were utilized to evaluate the downburst wind load.Pressure distributions on three prism-shaped building models with different placements and angles were investigated to obtain the maximum wind action and mean pressure coefficients.The results showed that the maximum pressure coefficient would reach 1.0 on the top surface if the downburst just broke out over the edifice.Considering that the building was in the developing field of the downburst,the top and the front surfaces would be under high wind pressure and only the back surface would endure wind suction.When the downdraft happens away from the prismatic building,all surfaces,except the front surface,would subject to suction with different degrees.It was also found that the pressure coefficient on the right surface would get its negative peak at first and then go straight up to 0.6 as the angle changed from 0°to 45°and the wind pressure on the front surface would decrease slightly through the whole process.The assertive results provide elemental data for structural wind-resistant design in civil engineering for the downburst-prone areas. | LI HongHai OU JinPing | 2014 | Science China(Technological Sciences)2014，57，10： | 4 |
| 10 | Interface transferring mechanism and error modification of embedded FBG strain sensors显示文摘As the strain sensing element of a structural health monitoring,the study and the application of the fibre-optic bragg grating(FBG)have been widely accepted.The accuracy of the FBG sensor is highly dependent on the physical and the mechanical properties of the strain interface transferring characteristics among the layers of bare optical fibre,protective coating,adhesive layer and host material.In this paper,firstly,the general expression of the multilayer interface strain transferring mechanism is derived.Secondly,based on the defined average strain,the error-modified equation of the FBG sensor is obtained.Finally,in the light of the embedded tube-packaged FBG and the fibre reinforced polymer-optical fibre bragg grating(FRP-OFBG)strain sensors,developed in the Harbin Institute of Technology(HIT),the corresponding strain transferring laws have been studied,and the corresponding error modification coefficients have also been given,which are validated by experiments.The research results provide theories for the development and application of the embedded FBG sensors. | ZHOU Zhi LI Jilong OU Jinping | 2007 | Frontiers of Electrical and Electronic Engineering in China2007，2，1： | 3 |
| 11 | Design and validation of wireless acceleration sensor network for structural health monitoring显示文摘 | 喻言 Ou Jinping | 2006 | High Technology Letters2006，12，4： | 3 |
| 12 | Use of Different Mooring Models on Global Response Analysis of an Innovative Deep Draft Platform显示文摘The global responses of an innovative deep draft platform are investigated using catenary, semi-taut, and taut mooring models, respectively. The three mooring systems have the same arrangements and similar static restoring force characteristics. The dynamic coupling effects between the platform and the mooring systems are calculated in the time domain. Free-decay and 3-h simulations are conducted under 1-year and 100-year return period environmental conditions in the South China Sea. The mooring damping contributions, the response characteristics, and the mooring line tensions are investigated. | QIAO Dongsheng LI Binbin OU Jinping | 2014 | Journal of Ocean University of China2014，13，2： | 2 |
| 13 | A feedback latching controller for two-body wave energy converters under irregular wave conditions显示文摘Latching control is considered to be an effective way to improve the energy absorption of a wave energy converter(WEC).Recently, a latching control method was realized in a hydraulic power take-off(PTO) system and was demonstrated to be effective in one-body WECs. However, the effectiveness of latching control for two-body WECs still needs to be tested. In this paper, a feedback latching controller is proposed for a conceptual two-body WEC. In this conceptual design, a permanent-magnet linear generator(PMLG) is adopted as the PTO system, and a pure water hydraulic cylinder system is designed for performing the latching control. A feedback control strategy based on the measurement of latching force is established, formulated and tested numerically under realistic irregular wave conditions. The effects of the wave peak period and the PTO damping coefficient on the effectiveness of the latching control is also investigated. The results indicate that the proposed feedback latching control is effective for improving the annual power absorption of the two-body WEC. Furthermore, compared to another latching control,the proposed control is more practical because it does not require any knowledge of the wave conditions or the dynamics of the whole WEC system. | LIU Kun WANG DongJiao QIU ShouQiang YE JiaWei OU JinPing | 2018 | Science China(Technological Sciences)2018，61，8： | 2 |
| 14 | Effect of brace end rotation on the global buckling behavior of pin-connected buckling-restrained braces with end collars显示文摘 | Junxian Zhao Bin Wu Jinping Ou | 2012 | Engineering Structures2012，，： | 2 |
| 15 | A macro-level global seismic damage model considering higher modes显示文摘For modal pushover analysis procedures, the model proposed by Ghobarah et al.(called the G model hereafter, 1999) has been extended to account for the contributions of transient higher modes to global seismic damage of structures excited by strong ground motions. The proposed model has physically and perfectly bridged the G model and the final softening model proposed by DiPasquale and Cakmak(1988). Modal damage indexes corresponding to all considered vibration modes are combined by the CQC rule or the SRSS rule. Incremental dynamic analysis(IDA) is performed on three example RC frames to validate the proposed model, and a comprehensive comparison is carried out. The demonstration indicates that the proposed model is easy to implement and refl ects the influence of the transition in transient vibration periods and modes on structural damage evolution. Some limitations associated with the proposed model are also addressed. Further experimental validations are needed to improve the model in the future. | He Zheng Ou Xiaoying Ou Jinping | 2014 | Earthquake Engineering and Engineering Vibration2014，13，3： | 2 |
| 16 | Realization of the global yield mechanism of RC frame structures by redesigning the columns using column tree method显示文摘Global failure mechanism, i.e., the strong-column weak-beam mechanism, can provide higher total energy dissipation capacity with less ductility demand on components than other failure modes, and results in a more uniform story drift distribution and higher resistance to earthquake loads at the system level. However, the current code-based elastic design method cannot guarantee the global failure mechanism of frame structures under severe earthquakes. In this paper, a simple, but practical design procedure is proposed to ensure the global failure mechanism of reinforced concrete(RC) frame structures by redesigning the columns using the column tree method(CTM). CTM considers the yield limit state of all beams and column bases. The code-based design is firstly carried out to determine the section information of all beams and base columns. Then, the internal force demands applied on the column tree can be derived. Lastly, the column moments, shear forces and axial forces are determined according to the free-body diagram of CTM to finish the column redesign. Two RC frame structures with 6 and 12 stories are illustrated to verify the design procedure. The analytical results demonstrate the proposed approach can realize the global failure mechanism. | BAI JiuLin OU JinPing | 2015 | Science China(Technological Sciences)2015，58，10： | 2 |
| 17 | Traffic load modelling based on structural health monitoring data显示文摘 | Chengming Lan Hui Li Jinping Ou | 2011 | Structure and Infrastructure Engineering2011，，5： | 2 |
| 18 | Conceptual Design of a Deep Draft Semi-Submersible Platform with a Moveable Heave-Plate显示文摘Based on the principle of turned mass damper(TMD) systems,the conceptual design of semi-submersible platform with a moveable heave-plate(MHS) has been put forward.The heave motion response amplitude operator(RAO) and viscous damping of the MHS platform are calculated by iteration,and the coupling stiffness between the MHS hull and the heave-plate is optimized to decrease the maximum heave motion response of the MHS hull under 10-year survival conditions in the South China Sea.The nu-merical results indicate that the heave motion RAO of the MHS hull can be decreased in the range of predominant wave frequencies,which may provide some reference to the heave motion control of offshore platforms. | ZHU Hang OU Jinping ZHAI Gangjun | 2012 | Journal of Ocean University of China2012，11，1： | 2 |
| 19 | Substructure isolation and damage identification using free responses显示文摘Structural health monitoring(SHM)has become a hot and intensively researched field in civil engineering.Thereinto,damage identification play an important role in maintaining structural integrity and safety.Many effective methods have been proposed for damage identification.However,accurate global identification of large real-world structures is not easy due to their complex and often unknown boundary conditions,nonlinear components,insensitivity of global response to localized damages,etc.Furthermore,global identification often requires lots of sensors and involves large number of unknowns.This is costly,rarely feasible in practice,and usually yields severely ill-conditioned identification problems.Substructuring approach is a possible solution:substructuring methods can focus on local small substructures;they need only a few sensors placed on the substructure and yield smaller and numerically much more feasible identification problems.This paper proposed an improved substructure method using local free response for substructure damage identification.The virtual supports are constructed by Substructure Isolation Method(SIM)using the linear combination of the substructural responses.The influence of the global errors is isolated by adding the virtual supports on the main degree of freedoms(DOFs)of the substructure.Through the correlation analysis,the substructural modes are selected and used for damage identification of the substructure.A plain model of cable stayed bridge is used for the verification of the proposed method. | HOU JiLin JANKOWSKI Lukasz OU JinPing | 2014 | Science China(Technological Sciences)2014，57，9： | 2 |
| 20 | Flexural Demand on Pin-Connected Buckling-Restrained Braces and Design Recommendations显示文摘 | Junxian Zhao Bin Wu Jinping Ou | 2012 | Journal of Structural Engineering2012，，11： | 2 |
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