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2018 International Conference on Civil and Hydraulic engineering, IConCHE 2018

作者： Haiming, Liu Xiaxin, Tao China Merchants Chongqing Communication Research and Design Institute Co. Ltd State Key Laboratory of Bridge Engineering Structural Dynamics Chongqing400067 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

The the provisions on hydrodynamic pressure in two main seismic design codes of bridges in the world, Japanese code and Euro code, are reviewed. The difference on their theoretical bases, and numerical values are dealt with in this paper. In general, the effect of the pressure from Japanese code is larger than that from Euro code, and they are reaching similar at deep water situation. The latter could be considered as the upper bound of the former. A suggestion is contributed to the on going improvement of the Guidelines for seismic design of highway bridges of China, which consists of an equation for added mass and a set of values of pier section shape coefficients from the both codes. © Published under licence by IOP Publishing Ltd.

关键词： Piers

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Study on Tension Interval Estimation of bridge Suspenders with Complex Boundary Conditions

Study on Tension Interval Estimation of Bridge Suspenders wi...

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2018 International Conference on Modeling, Simulation and Optimization(MSO 2018)

作者： Jing-bo LIAO Jin-wen YIN Chen-kai LIU Dong HUANG Guang-wu TANG State Key Laboratory of Bridge Engineering Structural Dynamics Chongqing Communications Research & Design Institute

For the complex boundary conditions（BCs）,the tension estimate formulas of bridge suspenders aren't directly given as their frequency functions closely related with the boundary *** on three typical BCs,hinged-hinged BCs（HH）,clamped-hinged BCs（CH） and clamped-clamped BCs（CC）,three typical regions are reduced,namely,I typical regions:HH-CH,II typical regions:HH-CC and Ⅲ typical regions:***,based on Rayleigh theorem,the frequency value of the hinged-hinged boundary conditions are lower than that of the clamped-hinged boundary conditions,the clamped-hinged conditions lower than the clamped-clamped conditions for the same order *** full use of the united tension formulas of bridge suspenders for three typical BCs[1],the tension of bridge suspenders for the complex BCs can be roughly estimated by the interval estimation,I typical regions:T ≤T≤ T,Ⅱ typical regions:T≤T≤ T and Ⅲ typical regions:T≤T≤*** the practical bridge engineering,the tension estimation can be firstly calculated by this method in order to check whether the tension test is correct.

关键词： Short bridge suspender Interval estimation Complex boundary conditions United tension formulas

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Study on the Probabilities of Vessel-bridge Collision Considering the Influence of Existing Structures

Study on the Probabilities of Vessel-Bridge Collision Consid...

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作者： Sisi Wei Songlin Li China Merchants Chongqing Communications Research & Design Institute Co. Ltd. State Key Laboratory of Bridge Engineering Structural Dynamics

In order to take the protection provided by existing structures into account,Protection Factor was introduced to revise the method for calculating collision probability in the Guide Specification for Vessel Collision Design of River-Crossing bridges in Three Gorges Reservoir of Chongqing *** revised method was utilized to calculate the annual frequency of collision and collapse of Urban Rail Transit Egongyan bridge at present,in the short term and long term,considering the influence of the relative location of nearby existing bridge with the same span *** results indicate that when the existing bridge is assumed to be located upstream,the annual frequency of collision and collapse both decreases *** revised method presented in this paper offers a reference for probability analysis of vessel collision for bridges protected by existing structures nearby.

关键词： Study on the Probabilities of Vessel-bridge Collision Considering the Influence of Existing Structures

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Numerical Simulation of Hydrodynamic Pressure on bridge Pier in Water for a Model Test

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IOP Conference Series: Earth and Environmental Science 2020年第1期453卷

作者： Yifang Qin Xiaxin Tao Zhengru Tao Haiming Liu Institute of Engineering Mechanics CEA Harbin Heilonjiang 150080 China School of Civil Engineering Harbin Institute of Technology Harbin Heilongjiang 150036 China State Key Laboratory of Bridge Engineering Structural Dynamics China Merchants Chongqing Communication Research & Design Institute Co. Ltd Chongqing 400067 China

Finite element model with considering the fluid and structure interaction is built by software ADINA with the same conditions of a shaking table model test in this paper. The hydrodynamic pressures at 7 submerged depths on the water-pier interfaces, as the same positions the sensors fixed in the test, are calculated from motion inputs E1 with PGA of 0.2651g and E2 with PGA of 0.51g numerically in two direction combinations. The result shows that the pressures from the simulation and the test are close to each other, and means that the numerical procedure adopted in this paper is feasible to take into account the water-pier interaction, while the test results are also validated by the simulation.

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Preliminary Result of Seismic Hydrodynamic Pressure on bridge Pier with Submerged Depth from a Shaking Table Model Test

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IOP Conference Series. Earth and Environmental Science 2020年第1期453卷

作者： Liu, Haiming Xiaxin Tao Zhengru Tao Qin, Yifang State Key Laboratory of Bridge Engineering Structural Dynamics China Merchants Chongqing Communication Research & Design Institute Co. Ltd Chongqing 400067 China School of Civil Engineering Harbin Institute of Technology Harbin Heilongjiang 150036 China Institute of Engineering Mechanics CEA Harbin Heilonjiang 150080 China

To deal with the hydrodynamic pressure on bridge pier with submerged depth in water, a shaking table model test is reported in this paper. The model is designed and built for a pier of cable-stayed bridge submerged in 1.5 m water with a scale of 1/50. Two sets of motions, for E1 and E2 levels are input in two bi-directions, transverse and vertical, and longitudinal and vertical. The results show that the hydrodynamic pressure is getting larger with submerged depth obviously, with a. increasing rate larger than that for the formula in our existing design guidelines, but smaller than that by Westergaard.

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Enhanced CO2Photoreduction through Spontaneous Charge Separation in End-Capping Assembly of Heterostructured Covalent-Organic Frameworks

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Angewandte Chemie 2022年第50期134卷

作者： Huaxing Lin Yuan Liu Zirui Wang Liying Ling Hao Huang Prof. Qiaohong Li Linxiu Cheng Yibao Li Jilong Zhou Prof. Kaifeng Wu Prof. Jian Zhang Prof. Tianhua Zhou State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350108 China Contribution: Data curation (lead) Writing - original draft (lead) State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China Contribution: Data curation (supporting) School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Jiangxi Key Laboratory of Organic-Pharmaceutical Chemistry College of Chemistry and Chemical Engineering Gannan Normal University Ganzhou Jiangxi 341000 China Contribution: Formal analysis (supporting) College of Geography and Environmental Engineering Gannan Normal University Ganzhou Jiangxi 341000 China School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 China University of Chinese Academy of Sciences Beijing 100049 China Contribution: Funding acquisition (supporting) Supervision (supporting) Contribution: Funding acquisition (lead) Supervision (lead) Writing - review & editing (lead)

It is well known that charge separation is crucial for efficient photocatalytic solar conversion. Although some covalent-organic frameworks (COFs) exhibit visible-light harvest, the large exciton binding energies reduce their photocatalytic efficiencies. Herein, we developed a novel method to post-treat the olefin-linked COFs with end-capping polycyclic aromatic hydrocarbons (PAHs) for spontaneous charge separation. Interestingly, a type-II heterostructure is constructed in our perylene-modified COFs which displays drastically enhanced performance for photocatalytic CO 2 reduction, with an efficiency of 8-fold higher than that of unmodified COF. A combination of electrochemical, steady-state, and time-resolved spectroscopic measurements indicates that such drastically enhanced performance should be attributed to photoinduced spontaneous charge separation in the heterostructure. These results illustrate the feasibility of engineering the charge-separation properties of crystalline porous frameworks at a molecular level for artificial photosynthesis.

关键词： CO2 Reduction Charge Separation Covalent-Organic Framework Photocatalysis Post-Synthetic Modification

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Study on the Probabilities of Vessel-bridge Collision Considering the Influence of Existing Structures

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IOP Conference Series: Earth and Environmental Science 2019年第3期242卷

作者： Sisi Wei Songlin Li China Merchants Chongqing Communications Research & Design Institute Co. Ltd. Chongqing 400067 China State Key Laboratory of Bridge Engineering Structural Dynamics Chongqing 400067 China

In order to take the protection provided by existing structures into account, Protection Factor was introduced to revise the method for calculating collision probability in the Guide Specification for Vessel Collision Design of River-Crossing bridges in Three Gorges Reservoir of Chongqing City. This revised method was utilized to calculate the annual frequency of collision and collapse of Urban Rail Transit Egongyan bridge at present, in the short term and long term, considering the influence of the relative location of nearby existing bridge with the same span layout. The results indicate that when the existing bridge is assumed to be located upstream, the annual frequency of collision and collapse both decreases significantly. The revised method presented in this paper offers a reference for probability analysis of vessel collision for bridges protected by existing structures nearby.

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Importance of seismic hydrodynamic pressure for design of bridge pier in deep water from a numerical case study

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IOP Conference Series: Earth and Environmental Science 2019年第2期330卷

作者： Haiming Liu Xiaxin Tao Zhengru Tao Shiwang Zhang State Key Laboratory of Bridge Engineering Structural Dynamics China Merchants Chongqing Communication Research & Design Institute Co. Ltd Chongqing 400067 China School of Civil Engineering Harbin Institute of Technology Harbin Heilongjiang 150036 China Institute of Engineering Mechanics CEA Harbin Heilonjiang 150080 China

The importance to take into account the hydrodynamic pressure on bridge pier in deep water for seismic design is deal with in this paper from a numerical case study. In that study, a bridge pier in 54 m water is modeled as single pier, the interaction between soil-pile foundation system and pier is expressed by springs from M method and mechanical analysis, that between water and the pier is by added mass and damping of moving water from Morison equation. Seismic responses of the model in conditions with 6 water depths and without water are calculated respectively, with inputs of 12 ground motions for 4 fortification intensities. The maximum values of shear forces at the bottom of the pier are acquired from the corresponding response time histories, and compared with those without water. The result shows that the effect of the hydrodynamic pressure must be taken into account in design of bridge in deep water as it may be even larger than that of strong ground motion if water depth is larger than 50 m.

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On Difference between the Provisions for Seismic Hydrodynamic Pressure on bridge pier in Japanese code and Euro code 8

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IOP Conference Series: Earth and Environmental Science 2018年第2期189卷

作者： Liu Haiming Tao Xiaxin China Merchants Chongqing Communication Research & Design Institute Co. Ltd State Key Laboratory of Bridge Engineering Structural Dynamics Chongqing 400067 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

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Native diversity buffers against severity of non-native tree invasions ( vol 621,pg 773 , 2023 )

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NATURE 2023年第7982期622卷 E2-E2页

作者： Delavaux, Camille S. Crowther, Thomas W. Zohner, Constantin M. Robmann, Niamh M. Lauber, Thomas van den Hoogen, Johan Kuebbing, Sara Liang, Jingjing de-Miguel, Sergio Nabuurs, Gert-Jan Reich, Peter B. Abegg, Meinrad Yao, Yves C. Adou Alberti, Giorgio Zambrano, Angelica M. Almeyda Alvarado, Braulio Vilchez Alvarez-Davila, Esteban Alvarez-Loayza, Patricia Alves, Luciana F. Ammer, Christian Anton-Fernandez, Clara Araujo-Murakami, Alejandro Arroyo, Luzmila Avitabile, Valerio Aymard, Gerardo A. Baker, Timothy R. Balazy, Radomir Banki, Olaf Barroso, Jorcely G. Bastian, Meredith L. Bastin, Jean-Francois Birigazzi, Luca Birnbaum, Philippe Bitariho, Robert Boeckx, Pascal Bongers, Frans Bouriaud, Olivier Brancalion, Pedro H. S. Brandl, Susanne Brienen, Roel Broadbent, Eben N. Bruelheide, Helge Bussotti, Filippo Gatti, Roberto Cazzolla Cesar, Ricardo G. Cesljar, Goran Chazdon, Robin Chen, Han Y. H. Chisholm, Chelsea Cho, Hyunkook Cienciala, Emil Clark, Connie Clark, David Colletta, Gabriel D. Coomes, David A. Valverde, Fernando Cornejo Corral-Rivas, Jose J. Crim, Philip M. Cumming, Jonathan R. Dayanandan, Selvadurai de Gasper, Andre L. Decuyper, Mathieu Derroire, Geraldine DeVries, Ben Djordjevic, Ilija Dolezal, Jiri Dourdain, Aurelie Obiang, Nestor Laurier Engone Enquist, Brian J. Eyre, Teresa J. Fandohan, Adande Belarmain Fayle, Tom M. Feldpausch, Ted R. Ferreira, Leandro V. Fischer, Markus Fletcher, Christine Frizzera, Lorenzo Gamarra, Javier G. P. Gianelle, Damiano Glick, Henry B. Harris, David J. Hector, Andrew Hemp, Andreas Hengeveld, Geerten Herault, Bruno Herbohn, John L. Herold, Martin Hillers, Annika Coronado, Euridice N. Honorio Hui, Cang Ibanez, Thomas T. Amaral, Ieda Imai, Nobuo Jagodzinski, Andrzej M. Jaroszewicz, Bogdan Johannsen, Vivian Kvist Joly, Carlos A. Jucker, Tommaso Jung, Ilbin Karminov, Viktor Kartawinata, Kuswata Kearsley, Elizabeth Kenfack, David Kennard, Deborah K. Kepfer-Rojas, Sebastian Keppel, Gunnar Khan, Mohammed Latif Killeen, Timothy J. Kim, Hyun Seok Kitayama, Kanehiro Kohl, Michael Korju Institute of Integrative Biology ETH Zurich (Swiss Federal Institute of Technology) Zurich Switzerland Department of Genetics Evolution and Environment University College London London UK The Forest School at The Yale School of the Environment Yale University New Haven CT USA Department of Forestry and Natural Resources Purdue University West Lafayette IN USA Department of Agriculture Forestry and Bioresources Seoul National University Seoul South Korea Department of Crop and Forest Sciences University of Lleida Lleida Spain Joint Research Unit CTFC–AGROTECNIO–CERCA Solsona Spain Wageningen University and Research Wageningen The Netherlands World Agroforestry (ICRAF) Nairobi Kenya Department of Forest Resources University of Minnesota St Paul MN USA Hawkesbury Institute for the Environment Western Sydney University Penrith New South Wales Australia Institute for Global Change Biology and School for Environment and Sustainability University of Michigan Ann Arbor MI USA Swiss Federal Institute for Forest Snow and Landscape Research WSL Birmensdorf Switzerland UFR Biosciences University Félix Houphouët-Boigny Abidjan Côte d’Ivoire Department of Agricultural Food Environmental and Animal Sciences University of Udine Udine Italy Faculty of Science and Technology Free University of Bolzano Bolzano Italy Spatial Ecology and Conservation Laboratory Department of Tourism Recreation and Sport Management University of Florida Gainesville FL USA Forestry School Tecnológico de Costa Rica TEC Cartago Costa Rica Fundacion ConVida Universidad Nacional Abierta y a Distancia UNAD Medellin Colombia Field Museum of Natural Histiory Chicago IL USA Center for Tropical Research Institute of the Environment and Sustainability UCLA Los Angeles CA USA Silviculture and Forest Ecology of the Temperate Zones University of Göttingen Göttingen Germany Division of Forest and Forest Resources Norwegian Institute of Bioeconomy Research (NIBIO) Ås Norway Museo de Hi

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