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| 1 | Fatigue reliability assessment for bridge welded details using long-term monitoring data显示文摘A reliability assessment method of fatigue life based on the long-term monitoring data is developed for welded details in steel box girder,and the application research is presented with examples of welded rib-to-deck details in Runyang Bridges. Firstly the fatigue damage limit-state function is established based on S-N curves and Miner's rule,and the probability distribution characteristics of the coefficients in the function are discussed in detail. The uncertainties in fatigue loading effects are mainly studied based on long-term monitoring data. In the traditional studies,only the uncertainty of equivalent stress range is considered in fatigue reliability assessment. However,stress cycle number is also treated as a random variable in this paper because we know traffic flow every day differs in a thousand ways. Then the optimization method is employed to calculate the fatigue reliability. After studying the changing law of the reliability indices with time and the effect of the randomness of stress cycle number on reliability,the effect of the traffic growth on the reliability is studied. This study shows that the uncertainty in the fatigue life of the welded details can be well studied based on structural health monitoring,so it is necessary to carry out long-term strain monitoring of the welded details for accurate fatigue reliability assessment during the whole service period. | DENG Yang DING YouLiang LI AiQun ZHOU GuangDong | 2011 | Science China(Technological Sciences)2011，54，12： | 24 |
| 2 | Environmental variability study on the measured responses of Runyang Cablestayed Bridge using wavelet packet analysis显示文摘The structural damage alarming method based on wavelet packet energy spectrum (WPES) for long-span cable-stayed bridges is presented through combination of ambient vibration test and wavelet packet analysis. The environmental variability in the measured WPES and damage alarming indices ERVD of the Runyang Cable-stayed Bridge are discussed in detail using the wavelet packet analysis of the measured acceleration responses of the bridge under daily environmental conditions. The analysis results reveal that the actual environmental conditions including traffic loadings, environmental temperature and typhoon loadings have remarkable correlations with the measured WPES. The changes of environmental temperature have a long-term trend influence on the WPES, while the influences of traffic and typhoon loadings on the measured WPES of the bridge present instantaneous changes because of the nonstationary properties of the loadings. The analysis results of the measured responses further reveal that the damage alarming indices ERVD can sensitively reflect the influences of environmental temperature and typhoon loadings on the dynamic properties of Runyang Cable-stayed Bridge. Therefore, the proposed structural damage alarming indices ERVD under ambient vibrations are suitable for real-time damage alarming for long-span cable-stayed bridges. | DING YouLiang LI AiQun LIU Tao | 2008 | Science China(Technological Sciences)2008，51，5： | 20 |
| 3 | Analysis and assessment of bridge health monitoring mass data——progress in research/development of “Structural Health Monitoring”显示文摘The 'Structural Health Monitoring' is a project supported by National Natural Science Foundation for Distinguished Young Scholars of China(Grant No.50725828).To meet the urgent requirements of analysis and assessment of mass monitoring data of bridge environmental actions and structural responses,the monitoring of environmental actions and action effect modeling methods,dynamic performance monitoring and early warning methods,condition assessment and operation maintenance methods of key members are systematically studied in close combination with structural characteristics of long-span cable-stayed bridges and suspension bridges.The paper reports the progress of the project as follows.(1) The environmental action modeling methods of long-span bridges are established based on monitoring data of temperature,sustained wind and typhoon.The action effect modeling methods are further developed in combination with the multi-scale baseline finite element modeling method for long-span bridges.(2) The identification methods of global dynamic characteristics and internal forces of cables and hangers for long-span cable-stayed bridges and suspension bridges are proposed using the vibration monitoring data,on the basis of which the condition monitoring and early warning methods of bridges are developed using the environmental-condition-normalization technique.(3) The analysis methods for fatigue loading effect of welded details of steel box girder,temperature and traffic loading effect of expansion joint are presented based on long-term monitoring data of strain and beam-end displacement,on the basis of which the service performance assessment and remaining life prediction methods are developed. | LI AiQun DING YouLiang WANG Hao GUO Tong | 2012 | Science China(Technological Sciences)2012，55，8： | 14 |
| 4 | Structural condition assessment of long-span suspension bridges using long-term monitoring data显示文摘这份报纸集中于用监视系统的结构的健康测量的长期的监视数据开发一种联机结构的条件评价技术。为 Runyang 暂停桥的频率温度和横梁结束排水量温度的季节的关联首先被执行。然后,用一个六顺序的多项式的一种统计建模技术进一步被使用提出频率温度和排水量温度,测量频率和排水量的反常变化用吝啬的价值控制图表从被检测的关联。分析结果证明更高的颤动模式和排水量的形式的频率与环境温度和建议方法展览有显著季节的关联为检测形式的频率和排水量的微导致损坏的变化的一个好能力。结果证明建议方法能有效地从频率和排水量时间系列消除温度复杂并发症并且很好适合长跨度的暂停桥监视的联机状况。监视的关键词结构的健康 - 形式的频率 - 横梁结束排水量 - 温度 - 季节的关联 - 暂停桥牌旁边支持了:在资助号码下面的中国的国家自然科学基础 50725828 与号码 50808041;不到资助号码 200802861011 的中国的教育部的博士节目基础;东南大学在下面的研究生院的科学研究基础资助没有。 | Deng Yang~+,Ding Youliang~(++) and Li Aiqun~§Key Laboratory of Concrete & Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 210096,China PhD Student ++ Assistant Professor ~§Professor | 2010 | Earthquake Engineering and Engineering Vibration2010，9，1： | 12 |
| 5 | Research on seasonal correlation of wavelet packet energy spectrum and temperature of Runyang Suspension Bridge显示文摘In order to establish an environmental-condition-normalized structural damage alarming method,the seasonal correlation analysis of wavelet packet energy spectrum(WPES)and temperature of Runyang Suspension Bridge is performed by means of the 236-day health monitoring data.The analysis results reveal that the measured WPES has remarkable seasonal correlation with the environmental tempera-ture.The seasonal change of environmental temperature accounts for the variation of the damage alarming parameter Ip of the dominant frequency bands with an averaged variance of 200%.The statis-tical modeling technique using a 6th-order polynomial is adopted to formulate the correlation between the WPES and temperature,on the basis of which the abnormal changes of measured damage alarming parameter Ip are detected using the mean value control chart.It is found that the proposed method can effectively eliminate temperature complications from the time series of WPES and exhibit good capa-bility for detecting the damage-induced 10% variances of the damage alarming parameter Ip.And the proposed WPES-based method is superior the modal frequency and hence is more suitable for online real-time damage alarming for long-span bridges. | YouLiang Ding AiQun Li Jun Sun Yang Deng | 2009 | Science China(Technological Sciences)2009，52，6： | 10 |
| 6 | Study on correlations of modal frequencies and environmental factors for a suspension bridge based on improved neural networks显示文摘By using of long-term monitoring data of Runyang Suspension Bridge,the improved back-propagation neural networks (BPNNs) are formulated for modeling the correlations between modal frequencies and environmental conditions including wind,temperature and vehicle load.Then,with the correlation models the environmental effects on modal frequencies are quantified and the abnormal changes of measured frequencies are detected by means of the hypothesis tests.Analysis results reveal that BPNN-based correlation models improved by both early stopping and Bayesian regularization techniques exhibit excellent generalization capability.And the developed correlation models can effectively reduce the environmental variability in modal frequencies.The t-test method provides a good capability to detect the damage-induced 0.16% and 0.12% abnormal changes of the 5th and 6th modal frequencies,respectively.Hence,the proposed method is suitable for real-time monitoring of suspension bridge conditions. | DING YouLiang,DENG Yang & LI AiQun Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University,Nanjing 210096,China | 2010 | Science China(Technological Sciences)2010，53，9： | 9 |
| 7 | Assessment of bridge expansion joints using long-term displacement measurement under changing environmental conditions显示文摘This paper addresses the problem of condition assessment of bridge expansion joints using long-term measurement data under changing environmental conditions.The effects of temperature,traffic loading and wind on the expansion joint displacements are analyzed and interpreted,which reveal that measured displacements are observed to increase with an increase in temperature and to decrease with increased traffic loading,while the correlation between displacement and wind speed is very weak.Two regression models are developed to simulate the varying displacements under the changes in temperature and traffic loadings.Based on these models,the effects of the environmental conditions are removed to obtain the normalized displacement.Statistical process control using mean value control charts is further used to detect damage to the bridge expansion joints.The results reveal that the proposed method had a good capability for detecting the damage-induced 1.0%variances of the annual changes in the expansion joint displacements. | Youliang DING Aiqun LI | 2011 | Frontiers of Structural and Civil Engineering2011，5，3： | 8 |
| 8 | Fatigue monitoring and analysis of orthotropic steel deck considering traffic volume and ambient temperature显示文摘Fatigue has gradually become a serious issue for orthotropic steel deck used for long-span bridges. Two fatigue effects, namely number of stress cycles and equivalent stress amplitude, were introduced as investigated parameters in this paper. Investigation was focused on their relationships with traffic volume and ambient temperature by using 7-months fatigue monitoring data of an actual bridge. A fatigue analytical model considering temperature-induced changes in material property of asphalt pavement was established for verifying these relationships. The analysis results revealed that the number of stress cycles and equivalent stress amplitude showed a linear correlation with the traffic volume and ambient temperature, respectively, and that the rib-to-deck welded joint was much more sensitive to the traffic volume and ambient temperature than the rib-to-rib welded joint. The applicability of the code-recommended model for fatigue vehicle loading was also discussed, which revealed that the deterministic vehicle loading model requires improvement to account for significant randomness of the actual traffic conditions. | SONG YongSheng DING YouLiang | 2013 | Science China(Technological Sciences)2013，56，7： | 6 |
| 9 | Investigations on serviceability control of long-span structures under human-induced excitation显示文摘新结构的材料的增加的力量和新结构的跨度,为更大的苗条由美学要求伴随了,正在导致长跨度的结构的更多的应用。在这份报纸,有用性控制技术和它的设计理论被学习。首先,一篇小说调节了质量更潮湿(TMD ) 与可控制的僵硬被开发。第二,为为导致人的负担建模的方法被建议,包括站起来,走,跳并且跑,并且为长跨度的地板反应的一个分析方法基于一个有限元素模型被建议。第三,为就人的舒适而言与一个多重 TMD (MTMD ) 系统安装的长跨度的地板的一个设计方法被介绍,主要基于存在的研究文学。最后,一个图案,分析和领域测试包括北京奥林匹克派克公民会议中心,长沙新火车站和 Xian 在中国用几座大规模大楼被进行北火车站。分析并且 MTMD 系统用建议方法设计了的领域测试结果表演能够有效地减轻长跨度的地板结构的垂直颤动。在这份报纸介绍的学习为这些结构为类似的长跨度的地板的颤动有用性和控制系统的设计的分析提供重要引用。 | Chen Xin Ding Youliang Li Ai-qun Zhang Zhiqiang Sun Peng | 2012 | Earthquake Engineering and Engineering Vibration2012，11，1： | 3 |
| 10 | A new isolation device using shape memory alloy and its application for long-span structures显示文摘The key points to consider in determining the effectiveness of using structural isolation with shape memory alloys (SMA) are the constitutive model, the SMA isolation device and the analysis method. In this paper, a simplifi ed constitutive model based on the classic theory of plasticity is proposed to simulate the behavior of the superelasticity of the SMA, in which the martensite volume fraction is considered as one of the state variables. Comparisons between simulation results and experimental results are made and indicate that the proposed constitutive model yields stress-strain curves that are in good agreement with the experimental ones. Thus, the proposed model can correctly simulate the yield mechanism and energy dissipation capacity of the SMA. Next, in order to make full use of the superelasticity of SMA, a new SMA isolator composed of pre-tensioned SMA bars is presented. Then, a fi nite element analytical model is established to simulate the behavior of the SMA isolator according to its confi guration and simplifi ed constitutive model. Finally, a simplifi ed design method for long-span structures installed with SMA isolators is proposed, which is further used to investigate the isolation effects of a space grid structure. Results show that the SMA isolator can reduce the seismic responses of the structure effectively, which indicates the effectiveness of the proposed SMA isolation method. | Ding Youliang Chen Xin Li Aiqun Zuo Xiaobao | 2011 | Earthquake Engineering and Engineering Vibration2011，10，2： | 2 |
| 11 | Effect of exogenous silicon (Si) on H + -ATPase activity, phospholipids and fluidity of plasma membrane in leaves of salt-stressed barley ( Hordeum vulgare L.)显示文摘 | Yongchao Liang Wenhua Zhang Qin Chen Youliang Liu Ruixing Ding | 2005 | Environmental and Experimental Botany2005，，3： | 1 |
| 12 | Multi-source information fusion applied to structural damage diagnosis显示文摘 | Tao Liu AiQun Li YouLiang Ding DaLiang Zhao ZhiJun Li | 2011 | Structure and Infrastructure Engineering2011，，5： | 1 |
| 13 | A study on the WPT-based structural damage alarming of the ASCE benchmark experiments 显示文摘 | Ding Youliang Li Aiqun Liu Tao | 2008 | Advances in Structural Engineering2008，11，1： | 1 |
| 14 | A study on the WPT-based structural damage alarming of the ASCE benchmark experiments 显示文摘 | Ding Youliang Li Aiqun Liu Tao | 2008 | Advances in Structural Engineering2008，11，1： | 1 |
| 15 | Thermal field characteristic analysis of steel box girder based on long-term measurement data显示文摘 | Youliang Ding Guangdong Zhou Aiqun Li Gaoxin Wang | 2012 | International Journal of Steel Structures2012，，2： | 1 |
| 16 | A new look at the response surface method for reliability analysis using chaos theory显示文摘To overcome excessive computation errors and convergence failures encountered in an iterative calculation of the reliability index using the response surface method (RSM) for some nonlinear limit state functions, this study investigates an essential factor based on chaotic dynamics theory. The bifurcation diagrams of the reliability index are presented for some typical nonlinear limit state functions, and the computation results from the mapping functions due to the RSM iterations show the complicated dynamic phenomena such as the periodic oscillation, as well as bifurcation and chaos. From the numerical examples, it is concluded that the parameter of selection range f plays an important role in the convergence of the RSM iteration, and an improved RSM iterative algorithm is proposed with regard to the incorporation of the iterative sequential function of selection range f. The proposed method is shown to be efficient and to yield accurate results. | Ding Youliang, Li Aiqun and Deng Yang College of Civil Engineering, Southeast University, Nanjing 210096, China Lecturer Professor PhD Student | 2008 | Earthquake Engineering and Engineering Vibration2008，7，3： | 1 |
| 17 | Thermal field characteristic analysis of steel box girder based on long-term measurement data显示文摘 | Youliang Ding Guangdong Zhou Aiqun Li Gaoxin Wang | 2012 | International Journal of Steel Structures2012，，2： | 1 |
| 18 | Multi-scale damage analysis for a steel box girder of a long-span cable-stayed bridge显示文摘 | Ding Youliang Li Aiqun Du Dongsheng | 2010 | Structure and Infrastructure Engineering2010，6，6： | 1 |
| 19 | Fatigue Performance of Orthotropic Steel Decks in Super-Wide Steel Box Girder Considering Transverse Distribution of Vehicle Load显示文摘This study presents an investigation on the fatigue analysis of four types of details on orthotropic steel decks(OSDs)for a cable-stayed super-wide steel box girder bridge based on finite-element analysis(FEA)with vehicle transverse distribution model(VTDM).A high-fidelity 3D FE model verified by the static load test is established to satisfy the fatigue analysis accuracy.The stress behavior of super-wide steel box girders under the vehicle load at different lane locations is investigated.Then,considering the effect of VTDM,the fatigue life analysis of four typical details is performed using the Miner cumulative damage rule.The results show that the vehicle transverse location has a great influence on the stress behavior of details with sharp influence surface,and the stress ranges in the outermost lane are larger than those in other lanes,indicating that the details of OSD in the outermost lane are prone to fatigue.The fatigue life analysis indicates that the diaphragm cutout is more prone to fatigue than other details,which should be carefully treated in bridge maintenance. | Xudong Wang Changqing Miao Mao Yang Youliang Ding | 2021 | Structural Durability & Health Monitoring2021，15，4： | 0 |
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