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12th International Conference on Damage Assessment of Structures (DAMAS)

作者： Luo, W. F. Yu, L. Jinan Univ Sch Mech & Construct Engn Guangzhou 510632 Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

Compared with riveted and welded joints, bolted joints have advantages of easily dismantled, high load carrying and load-transferring capacity. However, bolted joints are also weaker components of assembled structures. Structural damage detection (SDD) on bolted joints is much required in the field of structural health monitoring (SHM). A new SDD method is proposed for damage identification of structures with bolted joints based on residual error of AR model in time series analysis. Firstly, a new data standardization process is defined to maintain the information of damage location. Then, a new structural damage feature sensitive to structural damage is developed based on the standard deviation of AR model residual errors. To verify the proposed method, a bolted joint structure is designed and fabricated in laboratory, connection damages of structures are simulated by loosening the bolted joints. The acceleration responses of structures with bolted joints under healthy and damage cases are acquired. Finally, the SDD is performed by traditional DSF and the new DSF. The illustrated results show that the proposed method is a hybrid tool for the bolted joint damage detection with the new damage-sensitive feature. In addition, some related issues will be discussed as well.

关键词： Bolted joints

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PSO-based Sparse Regularization Approach for Structural Damage Detection 13

PSO-based Sparse Regularization Approach for Structural Dama...

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13th International Conference on Natural Computation, Fuzzy Systems and Knowledge Discovery (ICNC-FSKD)

作者： Luo, Ziwei Yu, Ling Jinan Univ Sch Mech & Construct Engn Guangzhou 510632 Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9781538621653

Structural damage detection (SDD) is one crucial step in the field of structural health monitoring (SHM). A novel particle swarm optimization (PSO)-based sparse regularization approach is proposed for the SDD problem in this study. Where, the classical first-order sensitivity analysis and the l(1/2)-norm regularization are introduced to define the objective function, so the SDD problem is converted into a kind of optimization problem which may be solved by the PSO accordingly. The approach includes two steps: the model updating based on sensitivity analysis is employed for the SDD in the first step, and some rough damage locations of structures are obtained by the PSO. Then only the possible damage locations are considered and the PSO is further used to quantify damage extents in the second step for higher SDD accuracy. The illustrated numerical simulations show that the proposed approach can not only effectively locate structural damage but also quantify damage extents with good accuracy as well as strong robustness to noises.

关键词： particle swarm optimization (PSO) structural damage detection (SDD) sparse regularization first-order sensitivity anlysis

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A novel PSO-based algorithm for structural damage detection using Bayesian multi-sample objective function

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STRUCTURAL engineering AND MECHANICS 2017年第6期63卷 825-835页

作者： Chen, Ze-peng Yu, Ling Jinan Univ Sch Mech & Construct Engn Guangzhou 510632 Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China China Three Gorges Univ Coll Civil Engn & Architecture Yichang 443002 Peoples R China

Significant improvements to methodologies on structural damage detection (SDD) have emerged in recent years. However, many methods are related to inversion computation which is prone to be ill-posed or ill-conditioning, leading to low-computing efficiency or inaccurate results. To explore a more accurate solution with satisfactory efficiency, a PSO-INM algorithm, combining particle swarm optimization (PSO) algorithm and an improved Nelder-Mead method (INM), is proposed to solve multi-sample objective function defined based on Bayesian inference in this study. The PSO-based algorithm, as a heuristic algorithm, is reliable to explore solution to SDD problem converted into a constrained optimization problem in mathematics. And the multi-sample objective function provides a stable pattern under different level of noise. Advantages of multi-sample objective function and its superior over traditional objective function are studied. Numerical simulation results of a two-storey frame structure show that the proposed method is sensitive to multi-damage cases. For further confirming accuracy of the proposed method, the ASCE 4-storey benchmark frame structure subjected to single and multiple damage cases is employed. Different kinds of modal identification methods are utilized to extract structural modal data from noise-contaminating acceleration responses. The illustrated results show that the proposed method is efficient to exact locations and extents of induced damages in structures.

关键词： structural damage detection PSO-INM multi-sample objective function benchmark model

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R-function method for bending problem of orthotropic plates

R-function method for bending problem of orthotropic plates

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第三届中国国际复合材料科技大会

作者： Shanqing Li Hong Yuan MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction EngineeringJinan University

The R-function theory and quasi-Green function method(QGFM) is applied to solve the bending problem of clamped orthotropic thin plates with complicated boundary shape. Firstly the model 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. R-function theory and quasi-Green function are 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 a good agreement. The proposed method is a novel and effective mathematical one.

关键词： Green's function integral equation R-function bending problem orthotropic plate

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Research on pipeline chaos detection based on ultrasonic guided wave 24th

Research on pipeline chaos detection based on ultrasonic gui...

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24th Australasian Conference on the Mechanics of Structures and Materials, ACMSM 2016

作者： Wen, Yuli Ma, Hongwei College of Science and Engineer Jinan University Guangzhou China Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Guangzhou China School of Civil Engineering Qinghai University Xining China

ISBN: (纸本)9781138029934

This article presents a study on weak ultrasonic guided waves signal processing. In long range detection or small defect detection, the defect echo often shows the characteristic of weak signal because of attenuation, which becomes the main obstacles of ultrasonic guided waves detection. Due to the sensitive dependence on initial condition and strong noise immunity of chaotic system, Duffing chaotic oscillator weak signal detection method based on ultrasonic guided wave has been proposed. When the critical chaotic system detect the weak signal, the system state will be change. The parameters of chaotic system was determined according to the ultrasonic guided wave detection. The maximum Lyapunov exponent is chosen to detect the system state change. The chaotic oscillator is proved to have good immunity to noise by using chaotic system to process different amplitudes of Gaussian white noise. Four kinds of section reduction ratio defects are analyzed respectively. The method has been verified to be useful to expand range and improve the sensitivity in pipes defect detection by the results of numerical simulations and experiments on 6 meters pipeline. © 2017 Taylor & Francis Group, London.

关键词： Chaotic systems

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The Reform and Practice of "Advanced Mathematics" Course for the Civil engineering Majors

The Reform and Practice of "Advanced Mathematics" Course for...

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2017 4th International Conference on Advanced Education Technology and Management Science(AETMS 2017)

作者： Shan-qing LI MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University

The paper analyzes the role of advanced mathematics for civil engineering students to learn professional course, and analyzes the advanced mathematics teaching of our school overseas students facing the pressing problem. Combined with the need of professional courses related to civil engineering, advanced mathematics teaching content of foreign students are discussed. From the different inner needs and personality characteristics of overseas students, the discussion of advanced mathematics teaching mode and teaching method is made. Break the traditional teaching framework of advanced mathematics, the problem of students be weary of learning advanced mathematics is solved. Research results have the general reference value to basic course teaching of overseas students of other major of science and technology.

关键词： Civil engineering Overseas students Advanced mathematics Teaching method

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Elastoplastic Analysis of Circular Tunnel Based on Drucker-Prager Criterion

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ADVANCES IN CIVIL engineering 2018年第Pt.8期2018卷 5149789.1-5149789.8页

作者： Yang, Xiongfei Yuan, Hong Wu, Jiayu Li, Shanqing Jinan Univ Inst Appl Mech MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Southern Univ Sci & Technol Dept Ocean Sci & Engn Shenzhen 518055 Peoples R China Univ Plymouth Sch Engn Plymouth PL4 8AA Devon England

Based on the Drucker-Prager yield criterion, the theoretical solution of stratigraphic deformation in tunnel excavation process is deduced by the cavity expansion theory. In view of soil loosening around the tunnel caused by the tunnel excavation process, the internal friction angle of the surrounding soil is not a constant but a function of normal stress. The piecewise linearization of the nonlinear yield function is used to analyze the elastoplastic solution of the cylindrical hole shrinkage. A comparison is conducted with a plastic zone in which the internal friction angle of the soil remains unchanged. It can be concluded that the radial stress, the tangential stress, the radial strain, and the tangential strain around the inner wall calculated from the former are smaller.

关键词： Internal friction angle Plastic zones CIRCULAR APERTURE interior walls circular tunnel tunnel Excavation process tunnel excavation friction angles cavity model theory

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Perturbation analysis for multiscale deformations of delaminated laminates

Perturbation analysis for multiscale deformations of delamin...

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第三届中国国际复合材料科技大会

作者： Jianghong Xue Fusong Jin Ying Xiong Fei Xia School of Mechanics and Construction Engineering Jinan University/Key Lab of Disaster Forecast and Control in Engineering Ministry of Education

This paper presents a perturbation approach to study the multi scale deflections in T300/QY8911 carbon fiber reinforced, delaminated laminates subjected to a transverse load. In previous works, the contact effects at the interfaces of the delaminated laminates were investigated. A contact factor was introduced to characterize the contact performances and was determined using the micro-mechanics of composite material. In this paper, asymptotic approaches are applied to analyze the large deflection of the delaminated laminates with nonlinear anti-penetrating constrains at the interfaces. Governing equations are solved using separation of variable and the asymptotic solutions are obtained from the Galerkin approach. Perturbation analysis is performed to demonstrate that(1) sublaminates above and below the delamination undergo a consistent global deflection;(2) local buckles occur on the interfaces of the delamination;and(3) the anti-penetrating contact performances are characterized by the local buckles. Furthermore, the asymptotic solutions reveal that the contact performances, i.e., the local buckling, are intrinsic properties of the laminates, relying only on the geometries of the delamination and the material properties. Numerical calculations are performed to demonstrate the application of the analytical solutions. The analytical solutions are in effect by comparing with the classic solutions and the well-established experimental results.

关键词： Perturbation analysis for multiscale deformations of delaminated laminates

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Fracture failure analysis of Fiber Reinforced Composites T-joints 4

Fracture failure analysis of Fiber Reinforced Composites T-j...

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4th International Conference on Advanced Composite Materials and Manufacturing engineering (ACMME)

作者： Su, Wei Kong, De-zhi Liu, Ren-huai Huang, Shi-qing China Elect Prod Reliabil & Environm Testing Res Sci & Technol Reliabil Phys & Applicat Technol El Guangzhou Guangdong Peoples R China Jinan Univ Dept Mech & Civil Engn Guangzhou Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou Guangdong Peoples R China

This paper discusses staple FRP T-joints on the project based on the classical beam theory of Euler-Bernoulli and a theoretical model of energy release rate is set up to discuss fracture propagation of composite T-joints. The paper is further analysis on fracture failure affected by composite pane depth and joints chamfer dimension parameters and so on. The conclusion benefit for extensive use of projects is also summarized.

关键词： Fiber reinforced plastics

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Mechanical Deformation Mechanism of Fiber Reinforced Composites T-joints 4

Mechanical Deformation Mechanism of Fiber Reinforced Composi...

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4th International Conference on Advanced Composite Materials and Manufacturing engineering (ACMME)

作者： Su, Wei Cheng, Ke-qiang Liu, Ren-huai Huang, Shi-qing China Elect Prod Reliabil & Environm Testing Res Sci & Technol Reliabil Phys & Applicat Technol El Guangzhou Guangdong Peoples R China Jinan Univ Dept Mech & Civil Engn Guangzhou Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou Guangdong Peoples R China

In this paper, we focus on the need for ideal theory analytical solution of mechanical deformation mechanism for T-joints. Through removing unnecessary constraints, stress equivalence system of T-joints can be established by force method. Solution equations of unknown nodal forces and the total vertical displacement can also be obtained, and this result can be used to evaluate strength of FRC T-joints.

关键词： Deformation

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