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Improving existing “reaching law” for better discrete control of seismically-excited building structures

Zhijun LI, Zichen DENG

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 111-116 doi: 10.1007/s11709-009-0022-5

Abstract: In this paper, a novel “composite reaching law” was explained in details: 1) the equation of discretemotion for a control system; 2) the design of discrete-time variable structure control.shear-type building structure was used to verify the effectiveness of the discrete variable structure controlThe results of numerical example analysis of the model show that the control law can effectively reducethe peak value of seismic response of the building structure and the chattering effect of the control

Keywords： discrete-time variable structure control     composite reaching law     chattering effect     saturated control law    

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“Partial pressures” of humid air in wide pressure and temperature ranges

Zidong WANG, Hanping CHEN, Shilie WENG

Frontiers in Energy 2013, Volume 7, Issue 4,   Pages 511-517 doi: 10.1007/s11708-013-0281-7

Abstract: obtained by the proposed method are quite different from that obtained by Dalton’s partial pressure lawSemi-permeable membrane models are proposed and applied for both saturated and unsaturated humid air.One discovery is that the “partial pressure” of the water vapor in saturated humid air equals , rather

Keywords： partial pressure     Dalton’s partial pressure law     humid air     saturated     unsaturated    

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China’s Ministry of Environmental Protection Adopted Draft Amendment to the Law on Prevention and Control

Fu Sun,Yi Liu

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 6, doi: 10.1007/s11783-016-0890-6

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Torsional vibrations of a cylindrical foundation embedded in a saturated poroelastic half-space

Dazhi WU,Lu YU

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 2,   Pages 194-202 doi: 10.1007/s11709-015-0292-z

Abstract: Considering the interactions between an embedded foundation and saturated soil, the torsional vibrationsof a cylindrical foundation embedded in a saturated poroelastic medium are analyzed in this paper.

Keywords： embedded foundation     saturated soil     rigid foundation     elastic foundation     torsional vibration    

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Seismic behavior of cantilever wall embedded in dry and saturated sand

Sanku KONAI, Aniruddha SENGUPTA, Kousik DEB

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3,   Pages 690-705 doi: 10.1007/s11709-020-0615-6

Abstract: In this paper, the behavior of a small scale model embedded cantilever retaining wall in dry and saturatedThe variation of the pore water pressures within the sand is also observed in the cases of saturatedwall due to seismic loading is below 1% of the total height of the wall in dry sand, but in case of saturated

Keywords： embedded cantilever wall     shake table test     FLAC2D     seismic loading     saturated and dry sand    

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Deriving Improved Newton's Second Law and the Law of Gravity at One Time with Form of Fractal Formula

Fu Yuhua

Strategic Study of Chinese Academy of Engineering 2003, Volume 5, Issue 6,   Pages 55-58

Abstract:

Newton's second law and the law of gravity are summarized with experimental results.For discussing the possibility of deriving the two laws theoretically, according to the law of conservationof energy, the method of deriving improved Newton's second law and the law of gravity at one timeresults suitable for this example with the constant dimension fractal form are as follows： improved lawof gravity F = - GMm/r1.99989 , and improved Newton's second law F = ma1.01458

Keywords： Newton & acute     s second law     the law of gravity     theoretical derivation    

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Experimental study of two saturated natural soils and their saturated remoulded soils under three consolidated

Mingjing JIANG, Haijun HU, Jianbing PENG, Serge LEROUEIL

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 2,   Pages 225-238 doi: 10.1007/s11709-011-0108-8

Abstract: In this paper, an experimental investigation is conducted to study the mechanical behavior of saturatednatural loess, saturated natural filling in ground fissure and their corresponding saturated remoulded

Keywords： stress paths     static liquefaction     natural soil     remoulded soil     loess     structure     total strength indices     excess pore pressure    

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How did Archimedes discover the law of buoyancy by experiment?

Hidetaka KUROKI

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 1,   Pages 26-32 doi: 10.1007/s11465-016-0368-z

Abstract: water measurement of golden crown is impossible, and at his Eureka moment, Archimedes discovered the lawHe did not find the law of buoyancy but rather specific gravity of things at the moment.Through these measurements, he reached the discovery of the law of buoyancy directly by experiment.

Keywords： Archimedes’ principle     buoyancy     specific gravity     Eureka     Vitruvius     displaced water     balance     floating body    

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Frost heave and freezing processes of saturated rock with an open crack under different freezing conditions

Zhitao LV, Caichu XIA, Yuesong WANG, Ziliang LIN

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4,   Pages 947-960 doi: 10.1007/s11709-020-0638-z

Abstract: Frost heave experiments on saturated sandstone and tuff with an open crack are conducted under uniformTo illustrate the reasons for this phenomenon, a numerical model on the freezing processes of saturated

Keywords： frost heave     rock with crack     freezing process     freezing condition     frost heave mode    

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Uncertainty assessment in hydro-mechanical-coupled analysis of saturated porous medium applying fuzzy

Farhoud KALATEH, Farideh HOSSEINEJAD

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 387-410 doi: 10.1007/s11709-019-0601-z

Abstract: of the present study was to develop a fuzzy finite element method, for uncertainty quantification of saturated

Keywords： fuzzy finite element method     saturated soil     hydro-mechanical coupled equations     coupled analysis     uncertainty    

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Why does environmental compliance cost more than penalty? —A legal analysis on environmental acts of enterprises in China

DONG Hongwei

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 4,   Pages 434-442 doi: 10.1007/s11783-007-0069-2

Abstract: In the environmental protection field of China, due to lower law-breaking cost but higher law-abidingcost , it is a common case that the enterprise chooses to break through the law on purpose.

Keywords： law-abiding     punishment     environmental protection     law-breaking     enterprise    

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Shaking table test of composite foundation reinforcement of saturated silty soil for high speed railway

JIANG Guanlu, LIU Xianfeng, ZHANG Jianwen, ZHAO Ruyi

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 353-360 doi: 10.1007/s11709-007-0047-6

Abstract: column-net composite foundation and cement fly-ash gravel (CFG) column-net composite foundation on the saturated

Keywords： large-scale     CFG column-net     amplifying     displacement     subgrade    

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Solutions for a completely saturated porous elastic solid with impeded boundaries

CHEN Yunmin, LING Daosheng, ZHU Bin, CHENG Zehai

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 322-328 doi: 10.1007/s11709-007-0042-y

Abstract: Analytical solutions are presented for the consolidation of a semi-infinite stratum and a finite soil layer with an impeding layer located on the surface subjected to a vertical point loading. The Laplace transform and the Hankel transform are used with respect to time and the radial coordinate, respectively. Solutions of other distributed loadings, including the circular loading, can be easily obtained by integrating those of the point loading. The consolidation degree, excess pore water pressure, vertical total stress, and the shear stress of the consolidating layer are analyzed in this study. The consolidation rate decreases with the increase in the thickness of the impeding layer. Stresses of the consolidating layer vary during the consolidation due to the coupling of the excess pore water dissipation and the soil skeleton deformation. Further, the Mandel-Cryer effect is also analyzed in this study.

Keywords： coupling     vertical     pressure     excess     distributed    

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Coupled diffusion of chloride and other ions in saturated concrete

Nattapong DAMRONGWIRIYANUPAP, Linyuan LI, Yunping XI

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3,   Pages 267-277 doi: 10.1007/s11709-011-0112-z

Abstract: Corrosion of reinforcing steel due to chloride ions is one of the severe deterioration problems in long-term performance of reinforced concrete structures. The deterioration process is frequently found in marine concrete structures, highway pavements, and bridges exposed to deicing salts. The diffusion of chloride ions is associated and strongly affected by other ions in the pore solution in concrete. In this paper, chloride penetration into concrete structures was mathematically characterized by the Nernst-Planck equation which considered not only diffusion mechanism of the chloride ions but also ionic interaction among other ions coming from externally applied deicers and within the Portland cement paste. Electroneutrality was used to determine the electrostatic potential induced by the ionic interaction. The material models of chloride binding capacity and chloride diffusion coefficient were incorporated in the governing equations. The governing equations were solved by using finite element method. A numerical example was used to illustrate the coupling effect of multi-ionic interactions and the effect of influential parameters. The numerical results obtained from the present model agreed very well with available test data.

Keywords： diffusion     chloride     concrete     Nernst-Planck equation     durability    

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finite element method for calculation and analysis to the elasto-plastic dynamic response of fluid-saturated

LI Liang, DU Xiuli, LI Liyun, ZHAO Chenggang

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 4,   Pages 436-442 doi: 10.1007/s11709-007-0059-2

Abstract: In order to describe the elasto-plastic dynamic response of fluid-saturated porous media, the incrementalelasto-plastic wave propagation equations of fluid-saturated porous media are developed by the fundamentaltheory of continuum mechanics and appointing to the characteristic of fluid-saturated porous media.element method is developed for calculation and analysis of the elasto-plastic dynamic response of fluid-saturated

Keywords： discretization     computational     calculation     integral     requirement    

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Title Author Date Type Operation

Improving existing “reaching law” for better discrete control of seismically-excited building structures

Zhijun LI, Zichen DENG

Journal Article

“Partial pressures” of humid air in wide pressure and temperature ranges

Zidong WANG, Hanping CHEN, Shilie WENG

Journal Article

China’s Ministry of Environmental Protection Adopted Draft Amendment to the Law on Prevention and Control

Fu Sun,Yi Liu

Journal Article

Torsional vibrations of a cylindrical foundation embedded in a saturated poroelastic half-space

Dazhi WU,Lu YU

Journal Article

Seismic behavior of cantilever wall embedded in dry and saturated sand

Sanku KONAI, Aniruddha SENGUPTA, Kousik DEB

Journal Article

Deriving Improved Newton's Second Law and the Law of Gravity at One Time with Form of Fractal Formula

Fu Yuhua

Journal Article

Experimental study of two saturated natural soils and their saturated remoulded soils under three consolidated

Mingjing JIANG, Haijun HU, Jianbing PENG, Serge LEROUEIL

Journal Article

How did Archimedes discover the law of buoyancy by experiment?

Hidetaka KUROKI

Journal Article

Frost heave and freezing processes of saturated rock with an open crack under different freezing conditions

Zhitao LV, Caichu XIA, Yuesong WANG, Ziliang LIN

Journal Article

Uncertainty assessment in hydro-mechanical-coupled analysis of saturated porous medium applying fuzzy

Farhoud KALATEH, Farideh HOSSEINEJAD

Journal Article

Why does environmental compliance cost more than penalty? —A legal analysis on environmental acts of enterprises in China

DONG Hongwei

Journal Article

Shaking table test of composite foundation reinforcement of saturated silty soil for high speed railway

JIANG Guanlu, LIU Xianfeng, ZHANG Jianwen, ZHAO Ruyi

Journal Article

Solutions for a completely saturated porous elastic solid with impeded boundaries

CHEN Yunmin, LING Daosheng, ZHU Bin, CHENG Zehai

Journal Article

Coupled diffusion of chloride and other ions in saturated concrete

Nattapong DAMRONGWIRIYANUPAP, Linyuan LI, Yunping XI

Journal Article

finite element method for calculation and analysis to the elasto-plastic dynamic response of fluid-saturated

LI Liang, DU Xiuli, LI Liyun, ZHAO Chenggang

Journal Article