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Peeling behavior and spalling resistance of CFRP sheets bonded to bent concrete surfaces

Acta Mechanica Sinica 2010年第2期26卷 257-264页

作者： Hong Yuan Faping Li MOE Key Lab of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University 510632 Guangzhou China

In this paper, the peeling behavior and the spalling resistance effect of carbon fiber reinforced polymer （CFRP） sheets externally bonded to bent concrete surfaces are firstly investigated experimentally. Twenty one curved specimens and seven plane specimens are studied in the paper, in which curved specimens with bonded CFRP sheets can simulate the concrete spalling in tunnel, culvert, arch bridge etc., whereas plane specimens with bonded CFRP sheets can simulate the concrete spalling in beam bridge, slab bridge and pedestrian bridge. Three kinds of curved specimens with different radii of curvature are chosen by referring to practical tunnel structures, and plane specimens are used for comparison with curved ones. A peeling load is applied on the FRP sheet by loading a circular steel tube placed into the central notch of beam to debond CFRP sheets from the bent concrete surface, meanwhile full-range load-deflection curves are recorded by a MTS 831.10 Elastomer Test System. Based on the experimental results, a theoretical analysis is also conducted for the specimens. Both theoretical and experimental results show that only two material parameters, the interfacial fracture energy of CFRP-concrete interface and the tensile stiffness of CFRP sheets, are needed for describing the interfacial spalling behavior. It is found that the radius of curvature has remarkable influence on peeling load-deflection curves. The test methods and test results given in the paper are helpful and available for reference to the designer of tunnel strengthening.

关键词： FRP sheet · Interfacial fracture energy ·Debonding · Spalling resistance · Bent concrete surface

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FAR FIELD SOLUTION OF SH-WAVE SCATTERED BY A CAVITY WITH ARBITRARY SHAPE IN ANISOTROPIC MEDIUM

FAR FIELD SOLUTION OF SH-WAVE SCATTERED BY A CAVITY WITH ARB...

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The 2011 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2011年全国压电和声波理论及器件技术研讨会)

作者： Zhi-gang Chen Jia-long Wu Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Jinan University Gu Department of Mechanics and Civil Engineering Jinan University Guang Zhou 510632 China

Based on the method of complex functions, the SH-wave scattered by a cavity with arbitrary shape in infinite anisotropic medium is investigated, and a far field solution of displacement is presented. As a result, the far field properties of the SH-wave scattered by circular, elliptical and square cavities in an anisotropic elastic medium with a symmetry plane are analyzed and some curves describing the far field properties of scattering SH-wave are obtained. The results show that the far field characteristic properties of the scattering SH-wave are determined by the incident wave, the geometric shape and the properties of medium. Additionally, the anisotropy of elastic medium has more significant influence on the far field displacement distribution than isotropy.

关键词： anisotropic medium cavity with arbitrary shape SH wave scattering far field solution complex functions

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GREEN QUASIFUNCTION METHOD FOR FREE VIBRATION OF SIMPLY-SUPPORTED TRAPEZOIDAL SHALLOW SPHERICAL SHELL ON WINKLER FOUNDATION

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Acta Mechanica Solida Sinica 2010年第4期23卷 370-376页

作者： Shanqing Li Hong Yuan (moe key laboratory of disaster forecast and control in engineering, Institute of Applied Mechanics, Jinan University, Guangzhou 510632, China) [a] MOE Key Laboratory of Disaster Forecast Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou 510632 China

The idea of Green quasifunction method is clarified in detail by considering a free vibration problem of simply-supported trapezoidal shallow spherical shell on Winkler foundation.A Green quasifunction is established by using the fundamental solution and boundary equation of the *** function satisfies the homogeneous boundary condition of the *** mode shape differential equation of the free vibration problem of simply-supported trapezoidal shallow spherical shell on Winkler foundation is reduced to two simultaneous Fredholm integral equations of the second kind by Green *** are multiple choices for the normalized boundary *** on a chosen normalized boundary equation, the irregularity of the kernel of integral equations is ***, natural frequency is obtained by the condition that there exists a nontrivial solution in the numerically discrete algebraic equations derived from the integral *** results show high accuracy of the Green quasifunction method.

关键词： Green function integral equation shallow spherical shell free vibration Winkler foundation

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THEORETICAL MODEL ON INTERFACE FAILURE MECHANISM OF REINFORCED CONCRETE CONTINUOUS BEAM STRENGTHENED BY FRP

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Acta Mechanica Solida Sinica 2009年第2期22卷 161-170页

作者： Hong Yuan Zifeng Lin MOE Key Lab of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou 510632 China

Fiber reinforced polymer （FRP） composites are increasingly being used for the re-pair and strengthening of deteriorated concrete structural components through adhesive bonding of prefabricated strips/plates and the wet lay-up of fabric. Interfacial bond failure modes have attracted the attention of researchers because of the importance. The objective of the present study is to analyse the interface failure mechanism of reinforced concrete continuous beam strength-ened by FRP. An analytical solution has been firstly presented to predict the entire debonding process of the model. The realistic bi-linear bond-slip interfacial law was adopted to study this problem. The crack propagation process of the loaded model was divided into four stages （elastic,elastic-softening,elastic-softening-debonded and softening-debonded stage）. Among them,elastic-softening-debonded stage has four sub-stages. The equations are solved by adding suitable stress and displacement boundary conditions. Finally,critical value of bond length is determined to make the failure mechanism in the paper effective by solving the simultaneously linear algebraic equations. The interaction between the upper and lower FRP plates can be neglected if axial stiffness ratio of the concrete-to-plate prism is large enough.

关键词： FRP interface bond-slip law critical length continuous beam ultimate load

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DYNAMIC BEHAVIORS OF A FRACTIONAL ORDER VISCOELASTIC TWO-MEMBER TRUSS SYSTEM

DYNAMIC BEHAVIORS OF A FRACTIONAL ORDER VISCOELASTIC TWO-MEM...

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The Third International Conference on Dynamics,Vibration and control(第三届国际动力学、运动与控制学术会议)

作者： LI Yuan-ping ZHANG Wei Key Lab of Disaster Forecast and Control in Engineering Ministry of EducationChina (Jinan University) Guangzhou 510632 China Department of Electronic EngineeringJinan University Guangzhou 510632 China Department of Mechanics and Civil Engineering Jinan University

The dynamic behaviours of a viscoelastic two-member truss system, subjected to sinusoidal excitation, are investigated in this *** viscoelastic material was assumed to obey the fractional calculus constitutive *** dynamic equation and the numerical computation scheme suited for this nonlinear fractional viscoelastic system are deducted;the dynamic behaviours are investigated by means of numerical methods of nonlinear dynamics, such as time domain, phase diagram, Poincare map, and so *** is found that there are plenty of dynamical phenomena, such as periodicity, bifurcation, quasi-periodicity and chaos in the system and the dynamical character is greatly inflected by the varying of material parameters.

关键词： Fractional derivative Viscoelasticity Mises truss Chaos

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Parametric study on PCA-based algorithm for structural health monitoring

Parametric study on PCA-based algorithm for structural healt...

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International Conference on Prognostics and Health Management, PHM

作者： Ling Yu Jun-hua Zhu Liu-jie Cheri Key Lab of Disaster Forecast and Control in Engineering of Ministry of Education P. R. China Jinan University Guangzhou China Department of Mechanics and Civil Engineering Jinan University Guangzhou China Department of Mechanics and Civil Engineering Jinan University China

Using the measured frequency response function (FRF) data, a novel algorithm for structural health monitoring is proposed based on the principal component analysis (PCA) in this paper. First, the measured FRF data for a structure in both the healthy and the damaged states are used as the initial data. A PCA transformation is performed to obtain the features of an intact structure, in which an orthogonal transformation matrix packed by the first few eigenvectors of covariance matrix can be found. Further, the orthogonal transformation matrix is applied to the FRF data of damage structures to extract the features of structure in the damage state. By comparing the features of structure in the two states, a new damage feature index, namely the median values of the principal components (PCs), is proposed for structural health monitoring. Finally, the efficiency and robustness of the proposed method is illustrated and validated by using the real data provided by the Los Alamos National laboratory, USA. This paper aims at investigating the effect of parameters, such as training data selection, sample points and so on. The illustrated results show that the PCA-based algorithm is correct and effective for structural health monitoring. The new damage feature index can reflect the structure state as well. The algorithm is purely based on the FRF data and independent of structure model, which makes it applicable for structural health monitoring in situ.

关键词： Parametric study Condition monitoring Principal component analysis Covariance matrix Frequency measurement Frequency response Data mining Feature extraction Personal communication networks Robustness

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Notice of Retraction: The Numerical Simulation of Crack Propagation without Re-Meshing

Notice of Retraction: The Numerical Simulation of Crack Prop...

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2009 International Conference on Information engineering and Computer Science, ICIECS 2009

作者： Yang, Shuai Wang, Hong Xia, Xiao-Zhou Yuan, Hong College of Civil and Transportation Engineering GDUT Guangzhou China Moe Key Lab of Disaster Forecast and Control in Engineering Institute of Applied Mechanics JNU Guangzhou China College of Civil Engineering HHU Nanjing China

ISBN: (纸本)9781424449941

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication *** hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this *** presenting author of this paper has the option to appeal this decision by contacting TPII@***.

关键词： Cracks

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Studies on wavelet packet-based crack detection for a beam under the moving load

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key engineering Materials 2009年 413-414卷 285-290页

作者： Weiwei, Zhang Zhihua, Wang Hongwei, Ma College of Science and Engineering Jinan University Guangzhou 510632 China The Key Lab of Disaster Forecast and Control in Engineering Ministry of Edu. of China 510632 China Institute of Applied Mechanics Taiyuan University of Technology Taiyuan 030024 China

The objective of this study is to show the potential of the crack detection method based on Wavelet Packet Transform (WPT), which is depending on the response at a single point on a beam subject to moving load. In this paper, an A-SYS model of a cracked beam is established. The moving load is transient analyzed by shifting the point of the concentrated force. The response at mid-span of the beam is calculated and wavelet packet transformed. The crack on the beam can be found by the abnormal signal in WPT branches. The size is also estimated by a defined damage index (Dindex) which relates to the energy of the abnormal signal. Finally, the effects of both crack location and wavelet selection on Dindex are discussed in detail.

关键词： Damage detection

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Dynamic FE simulation of large-scale single-layer spherical shell with viscoelastic dampers

Dynamic FE simulation of large-scale single-layer spherical ...

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2009 Joint International Conference on Modelling and Simulation

作者： Yuan, Ping Li Wei, Zhang Key Lab. of Disaster Forecast and Control in Engineering Ministry of Education China Jinan University China Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9781846260612

A vibration reduction system of viscoelastic dampers is introduced into Kewitte single-layer latticed spherical shell (D=60m). Through dynamic FE simulation, the stability of controlled shell and the correspondent uncontrolled one is compared. The different vibration schemes with initial geometric imperfection under different earthquake loadings are especially investigated. The results show that Liapunov stability of controlled shell with viscoelastic dampers can be evidently improved when compared with the uncontrolled shell;the vibration reduction is more obvious when considering the initial geometric imperfection of the shell. The damper's parameters have great influence on the vibration control effort.

关键词： Stability

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Analysis of optical transmission characteristics in the waveguide of side polished fiber

Analysis of optical transmission characteristics in the wave...

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2009 International Conference on Optical Instruments and Technology, OIT'09

作者： Zhe, Chen Zuping, He Fei, Cui Yating, Xiao Jun, Zhang Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education Jinan University 510632 China Key Lab. of Optoelectron. Info. and Sensing Technologies of Guangdong Higher Educational Institutes Jinan University Guangzhou 510632 China Department of Optoelectronic Engineering Jinan University Guangzhou510632 China

ISBN: (纸本)9780819478948

According to the experimental results of side polished fiber (SPF), a three dimensional optical waveguide model with longitudinal side polished transition zones is built. Based on the model, characteristics of optical transmission are calculated and analyzed by three dimensional finite differential beam propagation method. The model describes the optical transmission characteristics because the calculation based on the model is fitted well with the experiments. The calculation shows that the length of side polished area affects the optical attenuation of optical fiber, but the attenuation does not increased monotonically with the length when the length is less than certain value. The relationship between optical attenuation of SPF and the thickness of residual side polished cladding is not a monotonie one as well. The refractive index of overly on the side polished area has much more effect on the optical attenuation. Both width and thickness of overlay on the side polished area cause the oscillated change of optical power attenuation in the fiber core. © 2009 SPIE.

关键词： Light transmission

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