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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.Both a rigid foundation and an elastic foundation are considered.Assuming both the side surface and the bottom surface of the foundation are perfectly bonded to soil,of an embedded cylindrical foundation are presented.

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

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numerical simulation on compressive buckling behavior of thin steel skins in unilateral contact with rigid

Nicholas KEAGE, Christopher MAIOLO, Rebecca PIEROTTI, Xing MA

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3,   Pages 335-343 doi: 10.1007/s11709-011-0121-y

Abstract: In this paper, a practical test and finite element analysis has been undertaken to further investigate the effects of contact buckling. A test rig was designed and constructed to record vertical and transverse deflections of compressively loaded steel skin plates. The boundary conditions were modeled as fully fixed. A finite element analysis was also undertaken using the software package Strand7. Results from both analyses have been examined and compared to data established from previous studies on contact buckling. Both the finite element analysis and practical results correlate well with this data. The result of the investigation has confirmed contact buckling theories and has foreshadowed the onset of the newly observed phenomenon of secondary contact buckling.

Keywords： compressive     buckling     thin steel skins     unilateral contact     rigid constraints    

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Fundamental buckling of circular plates with elastically restrained edges and resting on concentric rigid

Lokavarapu Bhaskara Rao, Chellapilla Kameswara Rao

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 3,   Pages 291-297 doi: 10.1007/s11465-013-0255-9

Abstract: This work presents the existence of buckling mode switching with respect to the radius of concentric rigidThe optimum radius of the concentric rigid ring support for maximum buckling load is also determined.Introducing internal rigid ring support, when placed at an optimal position increases the elastic buckling

Keywords： buckling     circular plate     elastically restrained edge     rigid ring support     mode switching    

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Finite element modeling of environmental effects on rigid pavement deformation

Sunghwan KIM,Halil CEYLAN,Kasthurirangan GOPALAKRISHNAN

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 2,   Pages 101-114 doi: 10.1007/s11709-014-0254-x

Abstract: In this study, finite element (FE)-based primary pavement response models are employed for investigating the early-age deformation characteristics of jointed plain concrete pavements (JPCP) under environmental effects. The FE-based ISLAB (two-and-one-half-dimensional) and EverFE (three-dimensional) software were used to conduct the response analysis. Sensitivity analyses of input parameters used in ISLAB and EverFE were conducted based on field and laboratory test data collected from instrumented pavements on highway US-34 near Burlington, Iowa. Based on the combination of input parameters and equivalent temperatures established from preliminary studies, FE analyses were performed and compared with the field measurements. Comparisons between field measured and computed deformations showed that both FE programs could produce reasonably accurate estimates of actual slab deformations due to environmental effects using the equivalent temperature difference concept.

Keywords： jointed plain concrete pavements (JPCP)     curling and warping     sensitivity analyses     rigid pavement analysis    

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Modeling of semi-rigid beam-to-column steel joints under extreme loading

C FANG, B A IZZUDDIN, A Y ELGHAZOULI, D A NETHERCOT

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3,   Pages 245-263 doi: 10.1007/s11709-013-0215-9

Abstract: Due to sound energy dissipation capability and fabrication efficiency, semi-rigid joints have increasinglyThis paper presents a component approach for modeling semi-rigid beam-to-column joints based on Eurocode3

Keywords： semi-rigid joint     component method     ductility     elevated temperature    

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Phenolic rigid organic filler/isotactic polypropylene composites. III. Impact resistance property

Heming LIN, Dongming QI, Jian HAN, Zhiqi CAI, Minghua WU

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 2,   Pages 176-181 doi: 10.1007/s11705-009-0203-8

Abstract: A novel phenolic rigid organic filler (KT) was used to modify isotactic polypropylene (iPP).

Keywords： rigid organic filler     polypropylene     impact resistance    

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Structural optimization of typical rigid links in a parallel kinematic machine

Xinjun LIU, Zhidong LI, Xiang CHEN

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3,   Pages 344-353 doi: 10.1007/s11465-011-0227-x

Abstract: dynamics and accuracy of parallel kinematic machines largely depend on the weights and rigidity of typical rigidTherefore, these parts should be designed in such a way that they are light but rigid.This work employs the techniques of topology and size optimization to design two typical rigid links

Keywords： topology optimization     size optimization     parallel kinematic machine (PKM)    

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Dispersion of a novel phenolic rigid organic filler in isotactic polypropylene matrix by solution-mixing

Dongming QI, Xiaoli ZHAO, Zhijie CHEN, Peng HUANG, Jun CAO

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 4,   Pages 395-402 doi: 10.1007/s11705-012-1269-2

Abstract: A novel phenolic rigid organic filler (named KD) with a high melting point was dispersed in an isotactic

Keywords： dispersion     rigid organic filler     isotactic polypropylene     mixing    

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Study on rigid-flexible coupling dynamics of hub-plate system

ZHAO Feiyun, XIE Yongcheng, ZHANG Ming, HE Yinbiao

Frontiers in Energy 2007, Volume 1, Issue 2,   Pages 181-188 doi: 10.1007/s11708-007-0023-9

Abstract: Dynamic modeling of a rotating flexible hub-plate system is investigated by using Jourdain s variation principle in which the finite element method (FEM) is used as discretization method for a flexible plate. Different from the previous modeling of a plate with a prescribed large overall motion, the coupling between large overall motion of the system and elastic deformation of the flexible plate is taken into account in the proposed coupling model. The quadratic terms are included in the strain-displacement expression, such that the dynamic stiffening terms are included. Simulation of a rotating hub-plate system indicates that the linear model based on linear strain-displacement assumption may lead to erroneous results in the case of high rotation speed. Conservation of energy verifies the validity of the proposed model. Furthermore, frequency analysis of a hub-plate system shows the difference between the frequencies of the system with free and prescribed large overall motion, and parameter analysis of the system reveals the coupling characteristics of the rotational motion and the deformation.

Keywords： discretization     erroneous     Furthermore     Different     Conservation    

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Performance study on T-stub connected semi-rigid joint between rectangular tubular columns and H-shaped

Guochang LI, Hongping YU, Chen FANG

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3,   Pages 296-303 doi: 10.1007/s11709-013-0217-7

Abstract: This paper investigates the performance of T-stub connected semi-rigid joint of rectangular tubular columnsThe research results indicate that this joint is semi-rigid joint.

Keywords： rectangular tubular columns     T-stub     semi-rigid     nonlinear finite element analysis     moment-rotation curves    

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Phenolic rigid organic filler/isotactic polypropylene composites. II. Tensile properties

QI Dongming, SHAO Jianzhong, WU Minghua, NITTA Kohhei

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 4,   Pages 396-401 doi: 10.1007/s11705-008-0077-1

Abstract: A novel phenolic rigid organic filler (KT) was used to modify isotactic polypropylene (iPP).m at 200 mm/min, close to that of glass bead but far more than those of other rigid inorganic filler

Keywords： maximal     uniaxial tensile     unfilled     excellent tensile     influence    

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Numerical modeling of current-induced scour around multi-wall foundation using large-eddy simulation

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 546-565 doi: 10.1007/s11709-023-0943-4

Abstract: Scouring is one of the primary triggers of failure for bridges across rivers or seas. However, research concerning the scour mechanism of multi-wall foundations (MWFs) remains scarce, hindering the further application of MWFs. In this study, for the first time, the scouring effect caused by unidirectional flow around MWFs was examined numerically using FLOW-3D involving a large-eddy simulation. Initially, the applicability of the scouring model and input parameters was validated using a case study based on published measured data. Subsequently, the scouring effects of four MWFs with different wall arrangements and inflow angles, including the flow field analysis and scour pit and depth, were investigated thoroughly. It was found that the maximum scour depth of MWFs with an inflow angle of 0° was smaller than that of those with an inflow angle of 45°, regardless of the wall arrangement. Meanwhile, changing the inflow angle significantly affects the scour characteristics of MWFs arranged in parallel. In practical engineering, MWFs arranged in parallel are preferred considering the need for scouring resistance. However, a comparative analysis should be performed to consider comprehensively whether to adopt the form of a round wall arrangement when the inflow angle is not 0° or the inflow direction is changeable.

Keywords： multi-wall foundation     current-induced scour     bridge foundation     large-eddy simulation     numerical analysis    

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Evaluation of seismic reliability of gravity dam-reservoir-inhomogeneous foundation coupled system

Hamid Taghavi GANJI, Mohammad ALEMBAGHERI, Mohammad Houshmand KHANEGHAHI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3,   Pages 701-715 doi: 10.1007/s11709-018-0507-1

Abstract: The seismic performance of gravity dam-reservoir-foundation coupled system is investigated utilizingThe methodology is applied to Pine Flat gravity dam and the foundation is considered to be inhomogeneousThe effects of the deconvolution process, number of samples, and foundation inhomogeneity are investigated

Keywords： gravity dams     dam-reservoir-foundation interaction     seismic reliability     inhomogeneous foundation     earthquake    

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Application and development of modern long-span space structures in China

Shilin DONG, Yang ZHAO, Dong XING

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 3,   Pages 224-239 doi: 10.1007/s11709-012-0166-6

Abstract: paper provides a review of the structural characteristics and practical applications in China of modern rigidspace structures, modern flexible space structures and modern rigid-flexible combined space structures

Keywords： modern long-span space structures     rigid space structures     flexible space structures     rigid-flexible combined    

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Comparative study on foundation treatment methods of immersed tunnels in China

Shaochun WANG, Xuehui ZHANG, Yun BAI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1,   Pages 82-93 doi: 10.1007/s11709-019-0575-x

Abstract: typical traffic immersed tunnels built in China, this paper details the features of the four dominant foundationtreatment methods for immersed tunnel construction: pile foundation, sand flow foundation, groutingfoundation, and gravel bedding foundation.Further, a comprehensive comparison of settlement and cost of these four foundation treatment methodsThe findings of this article could henceforth be applied to foundation treatment work in immersed tube

Keywords： foundation treatment method     immersed tunnel     subsoil stress     settlement    

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Title Author Date Type Operation

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

Dazhi WU,Lu YU

Journal Article

numerical simulation on compressive buckling behavior of thin steel skins in unilateral contact with rigid

Nicholas KEAGE, Christopher MAIOLO, Rebecca PIEROTTI, Xing MA

Journal Article

Fundamental buckling of circular plates with elastically restrained edges and resting on concentric rigid

Lokavarapu Bhaskara Rao, Chellapilla Kameswara Rao

Journal Article

Finite element modeling of environmental effects on rigid pavement deformation

Sunghwan KIM,Halil CEYLAN,Kasthurirangan GOPALAKRISHNAN

Journal Article

Modeling of semi-rigid beam-to-column steel joints under extreme loading

C FANG, B A IZZUDDIN, A Y ELGHAZOULI, D A NETHERCOT

Journal Article

Phenolic rigid organic filler/isotactic polypropylene composites. III. Impact resistance property

Heming LIN, Dongming QI, Jian HAN, Zhiqi CAI, Minghua WU

Journal Article

Structural optimization of typical rigid links in a parallel kinematic machine

Xinjun LIU, Zhidong LI, Xiang CHEN

Journal Article

Dispersion of a novel phenolic rigid organic filler in isotactic polypropylene matrix by solution-mixing

Dongming QI, Xiaoli ZHAO, Zhijie CHEN, Peng HUANG, Jun CAO

Journal Article

Study on rigid-flexible coupling dynamics of hub-plate system

ZHAO Feiyun, XIE Yongcheng, ZHANG Ming, HE Yinbiao

Journal Article

Performance study on T-stub connected semi-rigid joint between rectangular tubular columns and H-shaped

Guochang LI, Hongping YU, Chen FANG

Journal Article

Phenolic rigid organic filler/isotactic polypropylene composites. II. Tensile properties

QI Dongming, SHAO Jianzhong, WU Minghua, NITTA Kohhei

Journal Article

Numerical modeling of current-induced scour around multi-wall foundation using large-eddy simulation

Journal Article

Evaluation of seismic reliability of gravity dam-reservoir-inhomogeneous foundation coupled system

Hamid Taghavi GANJI, Mohammad ALEMBAGHERI, Mohammad Houshmand KHANEGHAHI

Journal Article

Application and development of modern long-span space structures in China

Shilin DONG, Yang ZHAO, Dong XING

Journal Article

Comparative study on foundation treatment methods of immersed tunnels in China

Shaochun WANG, Xuehui ZHANG, Yun BAI

Journal Article