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Bending performance of composite bridge deck with T-shaped ribs

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Frontiers of Structural and Civil Engineering 2019年第4期13卷 990-997页

作者： Qingtian SU Changyuan DAI Xu JIANG Department of Bridge Engineering Tongji University Shanghai 200092 China

This paper proposes a new type of steel-concrete composite deck, which is composed of orthotropic steel deck (OSD) with T-shaped ribs, concrete plate and studs connecting OSD and concrete plate. The OSD can act as framework for concrete plate and contribute to load bearing capacity at the same time, which could save construction time. Compared with conventional OSD system, this new type of composite bridge deck can also improve fatigue performance.?Considering that this type of composite deck is not yet applied in practical engineering and its mechanical performance is not revealed in previous literatures, two full-scale specimens were designed and manufactured in this research. The mechanical performance, particularly, bending capacity in positive and negative region was carefully tested and analyzed. The load-deflection curve, load-slip relation, strain distribution in concrete and steel were obtained. The test results showed that the plastic performance of this kind of composite bridge deck was satisfying and the bending capacity was high.

关键词： bending performance composite bridge deck T-shaped steel ribs

Fatigue monitoring and analysis of orthotropic steel deck considering traffic volume and ambient temperature

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Science China(Technological Sciences) 2013年第7期56卷 1758-1766页

作者： SONG YongSheng DING YouLiang Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education Southeast University

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.

关键词： fatigue orthotropic steel deck structural health monitoring finite element model temperature traffic volume

Research on the Evaluation System of Epoxy Asphalt Steel deck Pavement Distress Condition

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Journal of Harbin Institute of Technology(New Series) 2019年第5期26卷 41-50页

作者： Hui Zhang Yingtao Li Xinxin Fu Youqiang Pan College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Ncmjing 210016 China Jiangsu SinoRoad Engineering Research Institute Co. Ltd. Ncmjing 211800 China Jiangsu Highway Engineering Maintenance Co. Ltd Ncinjing210049 China

Epoxy asphalt concrete has been one of the mainstream technology of steel deck pavement in China. But little specification about evaluation system for its distress condition has been researched and maintenance was still unsystematic. The section weight coefficient of different distress is proposed by analyzing the applicability of the “Highway Performance Assessment Standards”. Indexes mainly including SDPCI PDR and PCR are presented to evaluate its distress condition. The evaluation system and maintenance plan decision tree were recommended which can assist scientific maintenance of epoxy asphalt steel deck pavement.

关键词： steel deck pavement epoxy asphalt concrete distress condition evaluation system maintenance plan

Experimental Study on Shear Behavior of New-Type Steel-Concrete Composite Bridge deck

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Journal of Harbin Institute of Technology(New Series) 2018年第6期25卷 66-77页

作者： Qiu Zhao Yang Du Wenping Cai Ming Yang Rui Dong College of Civil Engineering Fuzhou University

To alleviate deck fatigue failure and regular pavement damage,which are congenital deficiencies of highway steel bridge deck structure,this paper proposes a newtype of composite bridge deck,consisting of steel tubular connectors and steel-reactive powder concrete (RPC). Push-out tests were conducted to study the newdeck's shear performance. During the experimental process,specimens were divided into two groups which are composed of steel tubular connectors with or without penetrative bars set in. Then,researchers analyzed destroyed models and mechanisms of the composite structure under shear forces. Results showed that test models in two groups,once destroyed,displayed similar shear fracture,which appeared on the lower margin of the steel tubular wall along the welds. Meanwhile,RPC under the connector,for varied tests,was crushed at the same stage,although the large shear and bending deformation just occurred on connectors with penetrative bars. Additionally,shear capacity of specimens with penetrative bars,compared with the ones without bars,unexpectedly decreased by 20%,but the structural ductility was 1.75 times as much,and the ductility coefficients of specimens were all larger than 3.5,demonstrating certain deformation capacity.

关键词： composite bridge deck push-out tests RPC steel tubular connectors failure mode

Fatigue Performance of Precast FRP-Concrete Composite deck with Long Span

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Engineering（科研） 2011年第11期3卷 1115-1123页

作者： Keunhee Cho Jeong-Rae Cho Sung Tae Kim Byung-Suk Kim Sung Yong Park 不详

The fatigue performance of precast FRP-concrete composite (PFC) deck is evaluated. This type of deck enables a reduction of the weight by 30% compared to conventional reinforced concrete decks owing to the composition of a hollow FRP panel with concrete. Therefore, the application of such deck in cable-stayed bridge will reduce effectively the weight of the superstructure leading also to substantial savings in the materials required for the superstructure and substructure and, therefore, achieve significant improvement of the economic efficiency. Static, pulsating fatigue and rolling fatigue tests were carried out on 4 m × 4 m precast FRP-concrete composite decks. All the specimens did not fail even after 2 million fatigue cycles, and the subsequent static tests conducted on these specimens verified that all the design criteria were satisfied. These experimental results demonstrated that the PFC deck developed in this research secures sufficient performances for future applications for cable-stayed bridges.

关键词： FRP Concrete Composite deck Long Span Fatigue Performance

Developments of Gussasphalt System on Steel deck Pavement

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World Journal of Engineering and Technology 2017年第3期5卷 141-147页

作者： Min Wang Deyong Hu Li Xiao Fei Shang China Merchants Chongqing Communications Research & Design Institute Co. Ltd. Chongqing China Chongqing Zhixiang Paving Technology Engineering Co. Ltd. Chongqing China

With the development of steel deck paving technology, the associated gussasphalt pavement system also develops maturely. In this paper, the structure characteristics and performance advantages are thoroughly explained by introducing the development course of gussasphalt. The material composition, properties and application effect of three typical pavement methods are analyzed. This paper is intended to give a relatively clear understanding regarding the specific features of gussasphalt, and provide some guidance to further expansion concerning gussasphalt pavement.

关键词： Steel deck Gussasphalt Pavement System Property Advantage

Development of Empirical Formulation for Bow Flare Slamming and deck Wetness for Displacement Vessels

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Journal of Marine Science and Application 2018年第3期17卷 414-431页

作者： Sharad DhavalikarI Prasada N.Dabbi Deepti Poojari Ramkumar Joga Sachin Awasare Research and Innovation Centre Indian Register of Shipping Mumbai 400 072India

The paper presents an empirical method to calculate bow flare slamming pressure and the green water load. Many empirical formulae for various types of vessels have been provided by rules of ship classification societies. In the present work, attempt is made to develop generalized formulations for all types of displacement vessels. Extreme sea conditions are considered. Bow flare pressure is derived in terms of flare and waterline angles. Specific condition for limiting waterline angle is derived based on 2 D numerical simulations. deck wetness is derived in terms of static and dynamic swell-up and the relative motion. Variation of static swell along the length is determined based on potential solution based analyses considering variation in vessels’ hull. 2 D wedge simulations are carried out to validate the formulation of dynamic swell-up. Results of the calculated bow flare and deck pressures are compared with various ship classification society formulations and the trends are found to be in good agreement in general barring at bow flare where lower pressure is found in most of the presented cases. Also IACS UR S21 A(2018) governing minimum pressure for deck scantlings is found to be conservative in few of the presented cases. Although scantlings assessment is not performed, the presented new formulations may help in realistic assessment of scantlings.

关键词： Bow flare slamming deck wetness Swell-up Relative freeboard Relative motion Flare angle

CAS FGOALS-f3-L model dataset descriptions for CMIP6 deck experiments

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Atmospheric and Oceanic Science Letters 2020年第6期13卷 582-588页

作者： HE Bian YU Yongqiang BAO Qing LIN Pengfei LIU Hailong LI Jinxiao WANG Lei LIU Yimin WU Guoxiong CHEN Kangjun GUO Yuyang ZHAO Shuwen ZHANG Xiaoqi SONG Mirong XIE Jinbo State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric Physics(IAP)Chinese Academy of SciencesBeijingChina CAS Center for Excellence in Tibetan Plateau Earth Sciences Institute of Tibetan Plateau Earth SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina Center for Ocean Mega-Science Chinese Academy of SciencesQingdaoChina School of Atmospheric Sciences Nanjing University of Information Science and TechnologyNanjingChina

The datasets of the Chinese Academy of Sciences(CAS)Flexible Global Ocean–Atmosphere–Land System(FGOALS-f3-L)model for the baseline experiment of the fully coupled runs in the Diagnostic,Evaluation and Characterization of Klima(deck)common experiments of phase 6 of the Coupled Model Intercomparison Project(CMIP6)are described in this *** CAS FGOALS-f3-L model team submitted the pi Control run with a near equilibrium ocean state for 561 model years,and 160-year integrations for three ensemble members of abrupt-4×CO2 and 1pct CO2,*** ensemble members restart from the 600,650 and 700 model years in the pi Control run,*** baseline performances of the model are validated in this *** preliminary evaluation suggests that the CAS FGOALS-f3-L model can preserve the long-term stability well for a mean net radiation flux of 0.31 W m-2at the top of the atmosphere,and a limited decreasing trend of-0.03 W m-2/100 *** global annual mean SST is 16.45°C for the 561-year mean,with an increase of 0.03°C/100 *** model captures the basic spatial patterns of climate-mean SST and precipitation,but still underestimates the SST over the warm *** coupled model mitigates the precipitation bias in the ITCZ compared with the results from ***,the model’s climate sensitivity represented by the equilibrium climate sensitivity has been reduced from 4.5°C in CMIP5 to 3.0°C in *** these datasets contribute to the benchmark of model behaviors for the desired continuity of CMIP.

关键词： CMIP6 deck FGOALS-f3-L piControl abrupt-4×CO2 1pctCO2 climate sensitivity

A Study on the Flexural Performance of UHPC Precast deck-Joint Interface by the Exposure of Steel Fiber

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Engineering（科研） 2014年第13期6卷 1000-1006页

作者： Kilje Jung Sung Yong Park Sung Tae Kim Byung-Suk Kim Keunhee Cho Structural Engineering Research Division SOC Research Institute Korea Institute of Civil Engineering and Building Technology Goyang-Si Korea

As a solution against the serviceability problem caused by the cracks occurring at the UHPC precast deck-joint interface, this study proposes a method exposing the steel fiber at the interface and evaluates the corresponding flexural performance of the lap spliced construction joint. After having slowed down the strength development of the concrete placed in the joint of the precast deck by means of a curing retardant, the concrete at the interface is crushed so as to expose the steel fibers and the change in the flexural performance is observed experimentally according to the exposure of the steel fibers. The results show that, even if the ultimate strength and stiffness of the UHPC precast deck including the joint are mostly determined by the arrangement details of the rebar lap splice, the exposure of the steel fibers can secure stable ductile behavior and reduce the width of the cracks generated at the precast deck-joint interface under service load.

关键词： Ultra-High Performance Concrete Precast deck System Steel Fiber Exposure Lap-Spliced Connection 4-Point Bending Test