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第三届数字制造与自动化国际会议

作者： Long ZHAO Hualin FAN Shiqing HUANG PLA University of Science and Technology Laboratory of Structural Analysis for Defense Engineering and Equipment College of Mechanics and Materials Hohai University State Key Laboratory of Automotive Safety and Energy Tsinghua University MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University

Woven textile sandwich composite （WTSC） is a light-weight structural material. The manufacturing method of WTSC was introduced in the paper. To reveal the quasi-static and the dynamic crushing behavior of WTSC, out-of-plane compression tests were carried out. Low-velocity impact experiments were carried out to investigate the anti-crush ability of WTSC. The results of the quasi-static and dynamic compression tests show that the woven textile sandwich material has good energy absorption ability. From the difference of the peak loads, it is concluded that the woven textiles have strain rate sensitivity. The intact woven textile sandwich panel and the destroyed one have different anti-crush abilities. Different methods are used to enhance the anti-penetrating of the intact woven textile sandwich panels, for example, increasing the content of the glass fibers, enlarging the diameter of the glass fibers and enlarging the height of front faces and the whole panel. From the experiments, it is concluded that WTSC has light weight, great specific strength and good energy absorption ability. WTSC is a promising light-weight structural material for vehicle bodies.

关键词： woven textile sandwich composite out-of-plane compression low-velocity impact

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Hydration Characteristics and Cementious Properties of Pyrolytic Steel Slag

Hydration Characteristics and Cementious Properties of Pyrol...

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2nd International Conference on Manufacturing Science and engineering

作者： OuYang, Dong Yi, Chengbo Xu, Weiting Lu, Liulei Jinan Univ Coll Sci & Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9783037850336

This study was to investigate the hydration characteristics and cementious properties of pyrolytic steel slag (PSS). Initially, PSS pastes were made to determine the hydration characteristics of PSS and the results indicated that the hydration activity of PSS with 6.4% gypsum content was stronger than that of paste with pure PSS. Afterwards, compressive strength of mortars were tested and the results showed that cement mortars with 0% to 30% replacement of PSS satisfied the requirements of activity index class of 80% at 28 days. As an activator, gypsum was supiror to calcium hydroxide in performance.

关键词： Pyrolytic Steel Slag Hydration Product Microstructure Activator

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Structural health monitoring based on continuous ACO method

Structural health monitoring based on continuous ACO method

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作者： Yu, Ling Xu, Peng MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China Department of Civil Engineering China Three Gorges University Yichang 443002 China

Structural damage detection remains as a challenging task in the field of structural health monitoring (SHM), which has occupied many scientific communities over the last two decades. As a new exploring attempt to the SHM problem, this paper proposes an ant colony optimization (ACO) based algorithm for continuous optimization problems on structural damage detection in the SHM field. First of all, the theoretical background of ACO is introduced for search of approximation best solution to discrete optimization problems and further to continuous optimization problems. Then four benchmark functions are used to evaluate the performance of continuous ACO (CnACO) algorithm. After that, the problem on the structural damage detection is mathematically converted into a constrained optimization problem, which is then hopefully solved by the CnACO algorithm. Meanwhile, effect of measurement noise on the algorithm is considered in all the damage scenarios. Upon extensive numerical simulations for single and multiple damages of a 2-storey rigid frame structure, the proposed method is extended to four damage patterns of a building model of 3-storey steel frame structure made in laboratory for further experimental verification of the proposed method. Illustrated results show that the proposed method is very effective for the structural damage detection. Regardless of weak damage or multiple damages, the identification accuracy is very high and the noise immunity is better, which shows that the proposed method is feasible and effective in the SHM field. © 2010 Elsevier Ltd. All rights reserved.

关键词： Ant colony optimization

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Structural health monitoring based on continuous ACO method

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MICROELECTRONICS RELIABILITY 2011年第2期51卷 270-278页

作者： Yu, Ling Xu, Peng Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China China Three Gorges Univ Dept Civil Engn Yichang 443002 Peoples R China

Structural damage detection remains as a challenging task in the field of structural health monitoring (SHM), which has occupied many scientific communities over the last two decades. As a new exploring attempt to the SHM problem, this paper proposes an ant colony optimization (AGO) based algorithm for continuous optimization problems on structural damage detection in the SHM field. First of all, the theoretical background of AGO is introduced for search of approximation best solution to discrete optimization problems and further to continuous optimization problems. Then four benchmark functions are used to evaluate the performance of continuous AGO (CnACO) algorithm. After that, the problem on the structural damage detection is mathematically converted into a constrained optimization problem, which is then hopefully solved by the CnACO algorithm. Meanwhile, effect of measurement noise on the algorithm is considered in all the damage scenarios. Upon extensive numerical simulations for single and multiple damages of a 2-storey rigid frame structure, the proposed method is extended to four damage patterns of a building model of 3-storey steel frame structure made in laboratory for further experimental verification of the proposed method. Illustrated results show that the proposed method is very effective for the structural damage detection. Regardless of weak damage or multiple damages, the identification accuracy is very high and the noise immunity is better, which shows that the proposed method is feasible and effective in the SHM field. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： STRUCTURAL health monitoring ALGORITHMS MATHEMATICAL optimization NUMERICAL analysis SIMULATION methods & models CONTINUUM damage mechanics CIVIL engineering

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Numerical Analysis of Interface Crack Propagation in Reinforced Concrete Beams Strengthened with FRP by Extended Isoparametric Finite Element Method

Numerical Analysis of Interface Crack Propagation in Reinfor...

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2nd International Conference on Information Computing and Applications

作者： Wang, Hong Yuan, Hong Yang, Shuai Jinan Univ Inst Appl Mech Moe Key Lab Disaster Forecast & Control Engn Guangzhou Peoples R China Guangdong Univ Technol Coll Civil & Transportat Engn Guangzhou Peoples R China

ISBN: (纸本)9783642252549

Extended isoparametric finite method (XIFEM) consists in enriching the basis of the classical finite element method and taking into account the discontinuity of the displacement field across the crack by a discontinuous function along the crack line. It simulates the discontinuous character resulted from discontinuity such as crack or joint and by some trigonometric basis functions around the crack tip to embody singularity at the end of discontinuity. With the improved XIFEM, the tracking of crack propagation in reinforced concrete beams strengthened with FRP is simulated and the failure model is analyzed. Compared with the traditional finite element method, the XIFEM allows crack surface to be in any position of finite element mesh without dense mesh near the crack tips and without re-meshing, therefore crack growth is traced and modeled effectively. The results show the effectiveness and superiority of the improved XIFEM.

关键词： Extended isoparametric finite element FRP interface crack propagation discontinuous function

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Out-of-plane Compression and Impact of Woven Textile Sandwich Composites

Out-of-plane Compression and Impact of Woven Textile Sandwic...

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International Conference on Digital Manufacturing & Automation

作者： Long ZHAO Hualin FAN Shiqing HUANG People's Liberation Army University of Science and Technology Nanjing China Laboratory of Structural Analysis for Defense Engineering and Equipment College of Mechanics and Materials Hohai University HHU Nanjing China State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing China MOE Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

Woven textile sandwich composite (WTSC) is a light-weight structural material. The manufacturing method of WTSC was introduced in the paper. To reveal the quasi-static and the dynamic crushing behavior of WTSC, out-of-plane compression tests were carried out. Low-velocity impact experiments were carried out to investigate the anti-crush ability of WTSC. The results of the quasi-static and dynamic compression tests show that the woven textile sandwich material has good energy absorption ability. From the difference of the peak loads, it is concluded that the woven textiles have strain rate sensitivity. The intact woven textile sandwich panel and the destroyed one have different anti-crush abilities. Different methods are used to enhance the anti-penetrating of the intact woven textile sandwich panels, for example, increasing the content of the glass fibers, enlarging the diameter of the glass fibers and enlarging the height of front faces and the whole panel. From the experiments, it is concluded that WTSC has light weight, great specific strength and good energy absorption ability. WTSC is a promising light-weight structural material for vehicle bodies.

关键词： Woven textile sandwich composite Out-of-plane compression Low-velocity impact

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Green Quasifunction Method for Bending Problem of Clamped Orthotropic Trapezoidal Thin Plates on Winkler Foundation

Green Quasifunction Method for Bending Problem of Clamped Or...

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The 2nd International Conference on Applied Mechanics and Mechanical engineering(ICAMME 2011)

作者： Shanqing Li Hong Yuan MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University

ISBN: (纸本)9783037852965

The Green quasifunction method(GQM) is applied to solve the bending problem of clamped orthotropic thin plates with trapezoidal boundary shape on Winkler foundation. Firstly the governing differential equation of the problem is reduced to the boundary value problem of the biharmonic operator, and then it is reduced to the Fredholm integral equation of the second kind by Green's formula. A Green quasifunction is established by using the fundamental solution and the boundary equation of the problem. This function satisfies the homogeneous boundary condition of the problem. The singularity of the kernel of the integral equation is overcome by choosing a suitable form of the normalized boundary equation. The comparison with ANSYS finite element solution shows good agreement. The proposed method is a novel and effective mathematical one.

关键词： Green's function integral equation R-function Winkler foundation bending of orthotropic plate

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Dynamic analysis of non-uniform continuous girder bridge under moving vehicle

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1st International Conference on Civil engineering, Architecture and Building Materials, CEABM 2011

作者： Chen, Zhigang Peng, Zilin Key Lab. of Disaster Forecast and Control in Engineering Ministry of Education of the People's Republic of China Jinan University Guangzhou 51632 China Department of Mechanics and Civil Engineering Jinan University Guangzhou 51632 China

ISBN: (纸本)9783037851258

For non-uniform continuous bridge in actual projects, the theoretical analysis and field testing of the dynamic response under moving vehicle are carried out. Firstly, Euler-Lagrange equation is applied to derive the vibration equation of three-axle vehicle. Then one obtains the dynamic analysis model by using the finite element method and the vehicle-bridge interaction equation based on the displacement coordination relationship of the contact between wheels and bridge. Lastly, numerical solutions are presented according to the dynamic response of the bridge, compared with the real values. The results show that: the roadway roughness and vehicle speed strongly influence the impact factor. © (2011) Trans Tech Publications.

关键词： Dynamic response

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Perturbation Analysis of Instability for Non-uniform Cylindrical Shells with Initial Imperfection

Perturbation Analysis of Instability for Non-uniform Cylindr...

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2011 China control and Decision Conference(2011中国控制与决策会议 CCDC)

作者： Jianghong Xue Department of Mechanics and Civil Engineering Jinan University / Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou 510632

Buckle propagation in subsea corroded pipelines is one of the most concerned problems in offshore industries, while locating the plastic hinges in the corroded pipeline is the crux in determining the buckle propagation pressure. This paper presents a methodology to determine the locations of plastic hinges in non-uniform shells subjected to external pressure. The non-uniform shell used to model the corroded pipeline has two Regions: Region 1 of reduced, inconstant thickness and Region 2 of nominal thickness. Analytical formulas for the bifurcation load, radial deformation, initial yield pressure and stress distribution in the non-uniform shell are derived from perturbation analysis using WKB expansion. The locations of plastic hinges are identified at the stress peaks by taking the derivative of the stress with respect to circumferential coordinate. Imperfection sensitivity of the non-uniform shell is assessed with an emphasis on the role of initial yield pressure and the locations of plastic hinges. Special case when the thickness of Region 2 is constantly reduced is examined. It is found that both the initial yield pressure and the locations of plastic hinges depend on the non-uniform conditions of the cylindrical shell.

关键词： Perturbation Analysis Location of Plastic Hinge Corroded Pipeline Buckle Propagation

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

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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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