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Time-dependent behaviour of interactive marine and terrestrial deposit clay

GEOMECHANICS AND engineering 2014年第3期7卷 279-295页

作者： Chen, Xiaoping Luo, Qingzi Zhou, Qiujuan Jinan Univ Coll Sci & Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Guangdong Tech Coll Water Resources & Elect Engn Guangzhou 510635 Guangdong Peoples R China

A series of one-dimensional consolidation tests and triaxial creep tests were performed on Nansha clays, which are interactive marine and terrestrial deposits, to investigate their time-dependent behaviour. Based on experimental observations of oedometer tests, normally consolidated soils exhibit larger secondary compression than overconsolidated soils;the secondary consolidation coefficient (C-a) generally gets the maximum value as load approaches the preconsolidation pressure. The postsurcharge secondary consolidation coefficient (C-a') is significantly less than C-a. The observed secondary compression behaviour is consistent with the C-a/C-c concept, regardless of surcharging. The C-a/C-c ratio is a constant that is applicable to the recompression and compression ranges. Compared with the stage-loading test, the single-loading oedometer test can evaluate the entire process of secondary compression;C-a varies significantly with time and is larger than the C-a obtained from the stage-loading test. Based on experimental observations of triaxial creep tests, the creep for the drained state differs from the creep for the undrained state. The behaviour can be predicted by a characteristic relationship among axial strain rate, deviator stress level and time.

关键词： secondary consolidation coefficient creep time-dependent interactive marine and terrestrial deposit clay laboratory

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Crack analysis of bridge piers of a rail transit line in Guangzhou city

Crack analysis of bridge piers of a rail transit line in Gua...

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2014 2nd International Forum on Mechanical and Material engineering, IFMME 2014

作者： Chen, Mu Xue, Jiang Hong Department of Mechanics and Civil Engineering Jinan University/Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou 510632 China

ISBN: (纸本)9783038350798

In order to study the bridge of a rail transit line in Guangzhou city, we use the finite element program Midas/FEA. Combining with the structure characteristics of the bridge, we establish space finite element model of piers. The linear and nonlinear analysis have been done respectively. In view of the nonlinear analysis, we analyze the left and right bearing under the most unfavorable load and dead load. The results show that as the ordinary reinforced concrete structure, bridge piers are bending crack under the design load. The width of crack controlled by force is less than the design value, so the bridge piers are in a safe state and it does not affect the normal operation. We noticed that the crack in piers appear a feature that width of crack become narrow in points under force controlling, but in other areas the crack in piers appear a feature that width of crack become wide. We have a preliminary judgment that the cause of this phenomenon may be the construction quality such as the actual reinforced protective layer are excessive, cooling measures in the process of the construction of the pier head of mass concrete did not reach the designated position, maintenance measures were in place and so on. The construction quality cause combined effects of mass concrete shrinkage crack and the structure of normal stress fracture. © (2014) Trans Tech Publications, Switzerland.

关键词： Finite element method

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Finite element analysis on the redistribution of reaction at support

Finite element analysis on the redistribution of reaction at...

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2nd International Conference on Precision Mechanical Instruments and Measurement Technology, ICPMIMT 2014

作者： Chen, Mu Xue, Jiang Hong Gan, Neng Department of Mechanics and Civil Engineering Jinan University Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou 510632 China

ISBN: (纸本)9783038351948

We use the finite element software Midas FEA to set up space entity model, and discuss various factors including the stiffness of bearing, counteracting force of adjacent beam, the influence of the stiffness of bridge pier on reaction at support. In the practical engineering. Coupling of shear lag, stiffness of beam, bending-torsional coupling and partial load can also affect the redistribution of reaction at support. Through the simulation of the finite element software, we check the support of a railway bridge in Guangzhou city. In the end we found that the stiffness of beam can make the middle support have a tendency to increase. If we take all the factors into account, the force of the middle support will be greater than on the both ends of bearing and the force on the both ends of bearing will be approximately equal. © (2014) Trans Tech Publications, Switzerland.

关键词： Finite element method

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Entity analysis of shear lag about grooved beam

Entity analysis of shear lag about grooved beam

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2nd International Conference on Precision Mechanical Instruments and Measurement Technology, ICPMIMT 2014

作者： Chen, Mu Xue, Jiang Hong Gan, Neng Department of Mechanics and Civil Engineering Jinan University/Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou 510632 China

ISBN: (纸本)9783038351948

We establish the entity model of groove beams in Midas FEA. Then we compare and analysis the shear lag effect of prestressed reinforcement caused in different locations. It can provide some suggestions for prestressed rib of groove beams. The result shows that when the prestressed steel beam is located in the middle of small beam, the effect of shear lag is maximum and the shear lag effects of prestressed in two ends are similar, Prestressed reinforcement can be arrangement refer to the results. © (2014) Trans Tech Publications, Switzerland.

关键词： Reinforcement

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Interfacial behavior of pipe joints under torsion loads 7

Interfacial behavior of pipe joints under torsion loads

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7th International Conference on FRP Composites in Civil engineering, CICE 2014

作者： Han, Jun Yuan, Hong Wu, Jiayu MOE Key Lab of Disaster and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou510632 China

ISBN: (纸本)9781771363082

The mechanic behavior and debonding process of pipe joints are the key points for pipe system. Based on the latest research result of pipe joints, the interfacial behavior of pipe joints is studied in this paper. Firstly, through the nonlinear fracture mechanics, the analytical expressions of the interfacial shear stress and the load-displacement relationship at loaded end of pipe joints under torsion loads are obtained. Thus, the shear stress propagation and the debonding progress of the whole interface for different bond lengths could be predicted. Secondly, through the analytical solutions, the influences of different bond length on the load-displacement curve and the ultimate load are studied. The stress transfer mechanism, the interface crack propagation and the ductility behavior of the joints could be explained. On the basis of fully knowing the interfacial behavior of the pipe joints under torsion loads, the full-range characteristic and the crucial factors of interfacial debonding problem can be further understood.

关键词： Torsional stress

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Architectural Aesthetics and Mechanical Behavior of Hagia Sophia 3

Architectural Aesthetics and Mechanical Behavior of Hagia So...

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3rd International Conference on Civil, Architectural and Hydraulic engineering (ICCAHE)

作者： Zhang, Xiao He, Jianhao Liang, Xinghua Huang, Shiqing Jinan Univ Dept Mech & Civil Engn Guangzhou 510632 Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China

Ancient architecture in Europe is one of the most historic and characteristic system in the world. It follows the order of combining structure and aesthetics. Researching in the pendentive used in Hagia Sophia, this p... 详细信息

ISBN: (纸本)9783038352587

关键词： Hagia Sophia Pendentive Mechanical properties Architectural aesthetics

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Dynamic compression failure mechanisms and dynamic effects of integrated woven sandwich composites

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JOURNAL OF COMPOSITE MATERIALS 2014年第4期48卷 427-438页

作者： Fan, Hualin Zhao, Long Chen, Hailong Zheng, Jingjing Jiang, Yifan Huang, Shiqing Kuang, Ning Ye, Chenxuan Hohai Univ Coll Mech & Mat Lab Struct Anal Def Engn & Equipment Nanjing Peoples R China PLA Univ Sci & Technol State Key Lab Disaster Prevent & Mitigat Explos & Hefei Peoples R China Tsinghua Univ State Key Lab Automot Safety & Energy Beijing Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou Peoples R China Sinoma Sci & Technol Co Ltd Nanjing Fiberglass Res & Design Inst Suzhou Peoples R China

Low-velocity dynamic compression tests were performed to reveal the failure mechanism and the energy absorption capacity of the integrated woven sandwich composite. Shear deformations were induced by the tilting of fiber piles in the core of the integrated woven sandwich composite. Ductile load-displacement curves are featured by a long deformation plateau originated from rotations of the core piles. Densification is apparent in the later stage of compression. Stout piles in the core also lead to plastic compression failure mode accompanying with much smaller rotations of core piles. controlled by the latter failure mode, the dynamic strength and the energy absorption of the panel are stronger. In dynamic compression experiments, the integrated woven sandwich composite panels exhibit similar failure modes with those observed in quasi-static compression tests. The dynamic strength is much greater and the corresponding deformation plateau is much more stable, which leads to greater energy absorption. The dynamic effects of the strength and the energy absorption were explained by the dynamic buckling of the woven struts in the core. The tests suggest that the integrated woven sandwich composite is ideal to serve as a lightweight anti-impact material in engineering structures.

关键词： Sandwich textile composites impact behavior stress strain curves

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Fiber pullout with stress transfer and fracture propagation

Fiber pullout with stress transfer and fracture propagation

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2014 International Conference on Industrial,Mechanical and Manufacturing Science(ICIMMS 2014)

作者： J.Y.Wu H.Yuan H.W.Gu MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied MechanicsJinan University

In this paper,a nonlinear fracture mechanics approach has been introduced to derive theoretical solutions for the shear stress transfer and crack propagation along the interface of the pull-pull and pull-push fiber-matrix pullout model by using the assumed bilinear local bond-slip *** for the maximum load,shear stress and crack propagation along fiber-matrix interface are derived ***,numerical simulations are conducted to discuss the factors influencing the interfacial *** this paper emphasizes on fiber-matrix pullout test,the analytical solution is equally applicable to similar test between spindly bars of other materials and concrete.

关键词： crack propagation FRP interfacial mechanics fracture mechanics

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Kirigami-based stretchable lithium-ion batteries

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SCIENTIFIC REPORTS 2015年第1期5卷 10988-10988页

作者： Song, Zeming Wang, Xu Lv, Cheng An, Yonghao Liang, Mengbing Ma, Teng He, David Zheng, Ying-Jie Huang, Shi-Qing Yu, Hongyu Jiang, Hanqing Arizona State Univ Sch Engn Matter Transport & Energy Tempe AZ 85287 USA Desert Vista High Sch Phoenix AZ 85048 USA Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Arizona State Univ Sch Elect Comp & Energy Engn Tempe AZ 85287 USA Arizona State Univ Sch Earth & Space Explorat Tempe AZ 85287 USA

We have produced stretchable lithium-ion batteries (LIBs) using the concept of kirigami, i.e., a combination of folding and cutting. The designated kirigami patterns have been discovered and implemented to achieve great stretchability (over 150%) to LIBs that are produced by standardized battery manufacturing. It is shown that fracture due to cutting and folding is suppressed by plastic rolling, which provides kirigami LIBs excellent electrochemical and mechanical characteristics. The kirigami LIBs have demonstrated the capability to be integrated and power a smart watch, which may disruptively impact the field of wearable electronics by offering extra physical and functionality design spaces.

关键词： LITHIUM-ion batteries ROLLING (Metalwork) FRACTURE mechanics ELECTROCHEMICAL analysis MECHANICAL properties of metals WEARABLE technology SMARTWATCHES

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Experimental Research on Creep Characteristics of Nansha Soft Soil

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SCIENTIFIC WORLD JOURNAL 2014年第1期2014卷 968738-968738页

作者： Luo, Qingzi Chen, Xiaoping Jinan Univ Coll Sci & Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

A series of tests were performed to investigate the creep characteristics of soil in interactive marine and terrestrial deposit of Pearl River Delta. The secondary consolidation test results show that the influence of consolidation pressure on coefficient of secondary consolidation is conditional, which is decided by the consolidation state. The ratio of coefficient of secondary consolidation and coefficient of compressibility (C-a/C-c) is almost a constant, and the value is 0.03. In the shear-box test, the direct sheer creep failure of soil is mainly controlled by shear stress rather than the accumulation of shear strain. The triaxial creep features are closely associated with the drainage conditions, and consolidation can weaken the effect of creep. When the soft soil has triaxial creep damage, the strain rate will increase sharply.

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