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Influence of core stiffness on the behavior of tall timber buildings subjected to wind loads

Zhouyan XIA, Jan-Willem G. VAN DE KUILEN, Andrea POLASTRI, Ario CECCOTTI, Minjuan HE

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1,   Pages 213-226 doi: 10.1007/s11709-021-0692-1

Abstract: This study analyzes the feasibility of the use of cross-laminated timber (CLT) as a load-bearing structural

Keywords： cross-laminated timber     tall timber buildings     finite element analysis     horizontal deflection     top acceleration    

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Free vibration analysis of laminated FG-CNT reinforced composite beams using finite element method

T. VO-DUY, V. HO-HUU, T. NGUYEN-THOI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 324-336 doi: 10.1007/s11709-018-0466-6

Abstract: In the present study, the free vibration of laminated functionally graded carbon nanotube reinforcedThe laminated beam is made of perfectly bonded carbon nanotubes reinforced composite (CNTRC) layers.shear deformation theory is used to formulate a governing equation for predicting free vibration of laminatedboundary conditions, length-to-thickness ratios and the numbers of layers on the frequencies of the laminatedMoreover, a laminated composite beam combined by various distribution types of CNTs is also studied.

Keywords： free vibration analysis     laminated FG-CNTRC beam     finite element method     first-order shear deformation theory    

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Thermal buckling behavior of laminated composite plates: a finite-element study

Houdayfa OUNIS,Abdelouahab TATI,Adel BENCHABANE

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 1,   Pages 41-49 doi: 10.1007/s11465-014-0284-z

Abstract:

In this paper, the thermal buckling behavior of composite laminated plates under a uniform temperaturenodes and 32 degrees of freedom (DOF), previously developed for the bending and mechanical buckling of laminatedcomposite plates, is extended to investigate the thermal buckling behavior of laminated composite platesinvestigate the effect of the anisotropy of composite materials on the critical buckling temperature of laminatedboundary conditions and the orientation angles significantly affect the critical buckling temperature of laminated

Keywords： thermal buckling     laminated composite plates     anisotropy     critical buckling temperature     finite-element method    

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Load-sharing mechanism in timber-steel hybrid shear wall systems

Zheng LI,Minjuan HE,Frank LAM,Minghao LI

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 2,   Pages 203-214 doi: 10.1007/s11709-015-0293-y

Abstract: The lateral performance of timber-steel hybrid shear wall systems with regard to the interaction betweenA numerical model for the timber-steel hybrid shear wall system was developed and verified against test

Keywords： timer-steel hybrid     shear wall     load sharing mechanism     seismic performance     parametric analysis    

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Stochastic analysis of laminated composite plate considering stochastic homogenization problem

S. SAKATA,K. OKUDA,K. IKEDA

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 2,   Pages 141-153 doi: 10.1007/s11709-014-0286-2

Abstract: This paper discusses a multiscale stochastic analysis of a laminated composite plate consisting of unidirectionalLaminated composites are widely used in civil engineering, and therefore multiscale stochastic analysisof laminated composites should be performed for reliability evaluation of a composite civil structureThis study deals with the stochastic response of a laminated composite plate against the microscopicnumerical results, importance of the multiscale stochastic analysis for reliability evaluation of a laminated

Keywords： stochastic homogenization     multiscale stochastic analysis     microscopic random variation     laminated composite    

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Error compensation for tool-tip trace during cutting of laminated paper for rapid prototyping

Yucheng DING, Changhe LI, Dichen LI, Guoxin YU

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 2,   Pages 111-119 doi: 10.1007/s11465-009-0020-2

Abstract: Laminated object manufacturing (LOM) is one of the commercialized rapid prototyping (RP) processes, wherea focused laser is usually used to cut the cross-section contours of a 3 D part and the grid hatchingsformulated to compensate for the tracing error of the eccentric knife tip by modifying the original cross-section

Keywords： rapid prototyping     laminated object manufacturing     knife-cutting     tracing error    

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Optimization of the mechanical performance and damage failure characteristics of laminated composites

Frontiers of Structural and Civil Engineering   Pages 1357-1369 doi: 10.1007/s11709-023-0996-4

Abstract: In this study, the effect of fiber angle on the tensile load-bearing performance and damage failure characteristics of glass composite laminates was investigated experimentally, analytically, and numerically. The glass fabric in the laminate was perfectly aligned along the load direction (i.e., at 0°), offset at angles of 30° and 45°, or mixed in different directions (i.e., 0°/30° or 0°/45°). The composite laminates were fabricated using vacuum-assisted resin molding. The influence of fiber orientation angle on the mechanical properties and stiffness degradation of the laminates was studied via cyclic tensile strength tests. Furthermore, simulations have been conducted using finite element analysis and analytical approaches to evaluate the influence of fiber orientation on the mechanical performance of glass laminates. Experimental testing revealed that, although the composite laminates laid along the 0° direction exhibited the highest stiffness and strength, their structural performance deteriorated rapidly. We also determined that increasing the fiber offset angle (i.e., 30°) could optimize the mechanical properties and damage failure characteristics of glass laminates. The results of the numerical and analytical approaches demonstrated their ability to capture the mechanical behavior and damage failure modes of composite laminates with different fiber orientations, which may be used to prevent the catastrophic failures that occur in composite laminates.

Keywords： fiber orientation     composite laminates     stiffness degradation     analytical approaches     finite element analysis    

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Modeling of heat and mass transfer for timber during radio-frequency and convective drying

Jia Xiaoran,Zhao Jingyao and Cai Yingchun

Strategic Study of CAE 2014, Volume 16, Issue 4,   Pages 106-112

Abstract:

The research based on the theory of porous medium heat and mass transfer，combined with the mechanism and characteristics of heat mass transfer in radio-frequency and convective drying，establish the mathematical model and give the definite condition through mass momentum and energy conservation equations. Each independent and dependent variable has independent control equation. Use the finite volume method to establish difference equation for to decouple the coupled partial differential equations，so that each independent variable can be solved independently when programming in Matlab or FORTRAN .

Keywords： timber     radio- frequency- convective drying     mathematical model     difference equation    

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Damage assessment of laminated composite beam structures using damage locating vector (DLV) method

T. VO-DUY,N. NGUYEN-MINH,H. DANG-TRUNG,A. TRAN-VIET,T. NGUYEN-THOI

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 457-465 doi: 10.1007/s11709-015-0303-0

Abstract: (DLV) method using normalized cumulative energy ( ) is employed to locate multiple damage sites in laminatedNumerical simulations of two laminated composite beams are employed to investigate several damage scenarios

Keywords： normalized cumulative energy     structural health monitoring (SHM)     damage locating vector method (DLV)     laminated    

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Methods and applications of DEA cross-efficiency: Review and future perspectives

Jie WU, Jiasen SUN, Liang LIANG

Frontiers of Engineering Management 2021, Volume 8, Issue 2,   Pages 199-211 doi: 10.1007/s42524-020-0133-1

Abstract: To address this problem, scholars have proposed the cross-efficiency evaluation (CREE) method.reviews the theory and applications of CREE, including the non-uniqueness problem, the aggregation of cross-efficiency

Keywords： cross-efficiency evaluation     efficiency     secondary goal model     aggregation     review    

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Finite element analysis of stress concentrations and failure criteria in composite plates with circular holes

Abdelhak KHECHAI,Abdelouahab TATI,Abdelhamid GUETTALA

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 3,   Pages 281-294 doi: 10.1007/s11465-014-0307-9

Abstract:

In this study, the stress concentration factors (SCF) in cross-and-angle-ply laminated composite plates32 degrees of freedom at each node, previously developed for the bending and mechanical buckling of laminatedcomposite plates, is used to evaluate the stress distribution in laminated composite plates with centralAdditionally, to determine the first ply failure (FPF) of laminated plate, several failure criterions

Keywords： laminated composite plates     stress concentration     geometric singularity     anisotropic effect    

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Prevalence and determinations of physical inactivity among public hospital employees in Shanghai, China: a cross-sectional

Xinjian Li,Minna Cheng,Hao Zhang,Ting Ke,Yisheng Chen

Frontiers of Medicine 2015, Volume 9, Issue 1,   Pages 100-107 doi: 10.1007/s11684-014-0372-9

Abstract: A cross-sectional study of 4612 employees aged 19 to 68 years was conducted through stratified cluster

Keywords： prevalence     determination     employee     public hospital     cross-sectional study     physical inactivity    

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River Chief System (RCS): An experiment on cross-sectoral coordination of watershed governance

Longfei Wang, Jiaxin Tong, Yi Li

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 4, doi: 10.1007/s11783-019-1157-9

Abstract:

The trans-regional characteristics of watershed governance produce more problems beyond the capacity of each individual water-related department, leading to the fragmentation of watershed management. The River Chief System (RCS) has experienced swift developments over the past decade in China by appointing the local government heads as river chiefs. RCS works efficiently in the short-term due to its superiority in the inclusion of clear responsibility, authority, and multi-sectoral collaboration. However, the characteristics of the authority-based vertical coordination of the hierarchical system remain unchanged, and therefore the problems of organizational logic and the responsibility dilemma still exist. Tasks including perfecting of laws, integrated watershed management, and public participation still need to be completed. RCS reflects the routine and characteristics of the migration of national governance, and as such provides new insights for other developing countries in the design of river management systems.

Keywords： River Chief System     Watershed governance     Cross-sectoral coordination     Environmental protection    

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Advances in eucalypt research in China

Yaojian XIE, Roger J. ARNOLD, Zhihua WU, Shuaifei CHEN, Apeng DU, Jianzhong LUO

Frontiers of Agricultural Science and Engineering 2017, Volume 4, Issue 4,   Pages 380-390 doi: 10.15302/J-FASE-2017171

Abstract: Eucalypt plantations in China currently exceed 4.5 Mhm , and this country has the third largest area of such plantations after India and Brazil. China’s eucalypt industry now comprises a complex, multifaceted industry including seedling propagation, fertilizer production and supply, plantation silviculture, harvesting and transport, wood processing for products including lumber, pulp and paper, and wood-based panels, as well as bioenergy production and various forest byproducts and non-wood forest products. In 2015, the combined value of output of this whole industry was around 300 billion CNY. Chinese research and development (R&D) has been instrumental in supporting growth and development across the whole breadth of the country’s eucalypt industry. In this report, recent advances in this R&D are reviewed under six key topics: (1) advanced propagation technology; (2) genetic resources and breeding; (3) targeted silviculture; (4) eucalypt disease and pest management; (5) enhancing plantation ecology and sustainability; and (6) wood processing and byproduct technology. R&D has greatly facilitated expansion and proliferation of all parts of China’s eucalypt industry. This industry is now of major importance to China’s economy; it involves tens of thousands of growers and companies that provide livelihoods for hundreds of thousands of people.

Keywords： China Eucalypt Research Centre     timber production     tree improvement     silviculture     forest industry     Eucalyptus    

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Air bearing center cross gap of neutron stress spectrometer sample table support system

Yang LI,Yunxin WU,Hai GONG,Xiaolei FENG

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 4,   Pages 403-411 doi: 10.1007/s11465-016-0405-y

Abstract: To study the performance of air bearing center cross gap, finite element models (FEMs) were establishedsupply pressure, and gap parameters on the overturning moment and bearing capacity of air bearing center cross

Keywords： neutron stress spectrometer     sample table     support system     air bearing     center cross gap     simulation     experiment    

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Title Author Date Type Operation

Influence of core stiffness on the behavior of tall timber buildings subjected to wind loads

Zhouyan XIA, Jan-Willem G. VAN DE KUILEN, Andrea POLASTRI, Ario CECCOTTI, Minjuan HE

Journal Article

Free vibration analysis of laminated FG-CNT reinforced composite beams using finite element method

T. VO-DUY, V. HO-HUU, T. NGUYEN-THOI

Journal Article

Thermal buckling behavior of laminated composite plates: a finite-element study

Houdayfa OUNIS,Abdelouahab TATI,Adel BENCHABANE

Journal Article

Load-sharing mechanism in timber-steel hybrid shear wall systems

Zheng LI,Minjuan HE,Frank LAM,Minghao LI

Journal Article

Stochastic analysis of laminated composite plate considering stochastic homogenization problem

S. SAKATA,K. OKUDA,K. IKEDA

Journal Article

Error compensation for tool-tip trace during cutting of laminated paper for rapid prototyping

Yucheng DING, Changhe LI, Dichen LI, Guoxin YU

Journal Article

Optimization of the mechanical performance and damage failure characteristics of laminated composites

Journal Article

Modeling of heat and mass transfer for timber during radio-frequency and convective drying

Jia Xiaoran,Zhao Jingyao and Cai Yingchun

Journal Article

Damage assessment of laminated composite beam structures using damage locating vector (DLV) method

T. VO-DUY,N. NGUYEN-MINH,H. DANG-TRUNG,A. TRAN-VIET,T. NGUYEN-THOI

Journal Article

Methods and applications of DEA cross-efficiency: Review and future perspectives

Jie WU, Jiasen SUN, Liang LIANG

Journal Article

Finite element analysis of stress concentrations and failure criteria in composite plates with circular holes

Abdelhak KHECHAI,Abdelouahab TATI,Abdelhamid GUETTALA

Journal Article

Prevalence and determinations of physical inactivity among public hospital employees in Shanghai, China: a cross-sectional

Xinjian Li,Minna Cheng,Hao Zhang,Ting Ke,Yisheng Chen

Journal Article

River Chief System (RCS): An experiment on cross-sectoral coordination of watershed governance

Longfei Wang, Jiaxin Tong, Yi Li

Journal Article

Advances in eucalypt research in China

Yaojian XIE, Roger J. ARNOLD, Zhihua WU, Shuaifei CHEN, Apeng DU, Jianzhong LUO

Journal Article

Air bearing center cross gap of neutron stress spectrometer sample table support system

Yang LI,Yunxin WU,Hai GONG,Xiaolei FENG

Journal Article