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  • Open Access

    REVIEW

    System Identification of Heritage Structures Through AVT and OMA: A Review

    Vinay Shimpi1, Madappa V. R. Sivasubramanian1,*, S. B. Singh2

    Structural Durability & Health Monitoring, Vol.13, No.1, pp. 1-40, 2019, DOI:10.32604/sdhm.2019.05951

    Abstract In this review article, the past investigations carried out on heritage structures using Ambient Vibration Test (AVT) and Operational Modal Analysis (OMA) for system identification (determination of dynamic properties like frequency, mode shape and damping ratios) and associated applications are summarized. A total of 68 major research studies on heritage structures around the world that are available in literature are surveyed for this purpose. At first, field investigations carried out on heritage structures prior to conducting AVT are explained in detail. Next, specifications of accelerometers, location of accelerometers and optimization of accelerometer networks have been elaborated with respect to the… More >

  • Open Access

    ARTICLE

    3-D Temperature Fields in Laminated Shells Subjected to Thermo-Loads

    Hai Qian1,*, Ding Zhou2, Bin Gu1, Rathnayaka Mudiyanselage D. M. S.3

    Structural Durability & Health Monitoring, Vol.12, No.4, pp. 281-298, 2018, DOI:10.32604/sdhm.2018.04618

    Abstract The temperature fields in the laminated shells were studied, including open cylindrical shells and cylindrical shells, according to the thermal theory. Analytical solution of the temperature in the shells with the known temperature on the surfaces was present. The thinning layer approach was introduced to simplify the three-dimensional heat conduction equation. Firstly, the layered shell was divided into N thinner layers. The governing equation was simplified by replacing the variable r by r0 in the center line of every thin layer. The general solutions of temperature satisfying the simplified three-dimensional governing equation in single-layered shell were deduced in the cylindrical… More >

  • Open Access

    ARTICLE

    2-D Statistical Damage Detection of Concrete Structures Combining Smart Piezoelectric Materials and Scanning Laser Doppler Vibrometry

    Costas P. Providakis1,*, Stavros E. Tsistrakis1, Evangelos V. Liarakos1

    Structural Durability & Health Monitoring, Vol.12, No.4, pp. 257-279, 2018, DOI:10.32604/sdhm.2018.04607

    Abstract In the present study a new structural health monitoring (SHM) technique is proposed as well as a new damage index based on 2-D error statistics. The proposed technique combines the electromechanical impedance technique (EMI) which is based on the use of piezoelectric Lead Zirconate Titanate (PZT) patches and Scanning Laser Doppler Vibrometry (SLDV) for damage detection purposes of concrete structures and early age monitoring. Typically the EMI technique utilizes the direct and inverse piezoelectric effect of a PZT patch attached to a host structure via an impedance analyzer that is used for both the actuation and sensing the response of… More >

  • Open Access

    ARTICLE

    Delamination Identification for FRP Composites with Emphasis on Frequency-Based Vibration Monitoring-A Review

    Mengyue He1, Zhifang Zhang1,*, Karthik Ram Ramakrishnan2

    Structural Durability & Health Monitoring, Vol.12, No.4, pp. 213-256, 2018, DOI:10.32604/sdhm.2018.05122

    Abstract Fibre reinforced polymer (FRP) composite laminates are now commonly used in many structural applications, especially in the aerospace industry, where margins of safety are kept low in order to minimise weight. Timely detection and assessment of damage (in particular delaminations) in composite laminates are therefore critical, as they can cause loss of structural integrity affecting the safe operation of the composite structures. The current trend is towards implementation of structural health monitoring (SHM) systems which can monitor the structures in situ without down time. In this paper, first, the current available SHM techniques for delamination detection in FRP composites are… More >

  • Open Access

    ARTICLE

    Simplified Method and Influence Factors of Vibration Characteristics of Isolated Curved Girder Bridge

    Tongfa Deng1,2, Junping Zhang1,3,*, Mahmoud Bayat4

    Structural Durability & Health Monitoring, Vol.12, No.3, pp. 189-212, 2018, DOI: 10.3970/sdhm.2018.04392

    Abstract The isolated curved girder bridge's vibration characteristics play a major part in the seismic responses of structures and anti-seismic properties. A clear analytic relationship between design parameters and the system's vibration characteristics could be established by its simplified dynamic analysis model, making it convenient for providing a reference to the optimization of design and safety analysis. A double-mass six-degree-of-freedom model for curved girder bridges with isolation bearings installed at the top of the bridge piers is built and a simplified analysis method for the vibration characteristics of the system is provided. Combined with the Matlab programming, the influences of radius… More >

  • Open Access

    ARTICLE

    Time Series Analysis for Vibration-Based Structural Health Monitoring: A Review

    Kong Fah Tee 1,*

    Structural Durability & Health Monitoring, Vol.12, No.3, pp. 129-147, 2018, DOI: 10.3970/sdhm.2018.04316

    Abstract Structural health monitoring (SHM) is a vast, interdisciplinary research field whose literature spans several decades with focusing on condition assessment of different types of structures including aerospace, mechanical and civil structures. The need for quantitative global damage detection methods that can be applied to complex structures has led to vibration-based inspection. Statistical time series methods for SHM form an important and rapidly evolving category within the broader vibration-based methods. In the literature on the structural damage detection, many time series-based methods have been proposed. When a considered time series model approximates the vibration response of a structure and model coefficients… More >

  • Open Access

    ARTICLE

    A “Three-index” Seismic Performance Evaluation Method Based on Sino-US Seismic Code

    Hui Wang1,*, Shuqi Wan2

    Structural Durability & Health Monitoring, Vol.12, No.3, pp. 149-167, 2018, DOI: 10.3970/sdhm.2018.03928

    Abstract The Code for Seismic Design of Buildings (GB50011-2010) in 2016 and the method of seismic performance-based design for high-rise buildings in the Guide for Performance-based Design of High-Rise Buildings (TBI2017) are compared. In view of the characteristics and limitations of the seismic performance index set by the Sino-US seismic code, a “three-index” performance index system and evaluation process considering the displacement angle of the structural interlayer, the plastic damage degree of components and the plastic strain of material is put forward; combining the example of time-history analysis of a out-of-code high-rise building under the rare earthquakes is verified. The results… More >

  • Open Access

    ARTICLE

    Comparative Study on Diagonal Strut Model of Infill Wall

    Zhenling Chai1, Zixiong Guo1,*, Xiaojuan Liu1, Yunfan Jiang1

    Structural Durability & Health Monitoring, Vol.12, No.3, pp. 169-187, 2018, DOI: 10.3970/sdhm.2018.00240

    Abstract The equivalent diagonal strut models of infill wall mainly include the single strut model and multi-strut model. Firstly, several equivalent strut models and their characteristics are introduced in this paper. Then, model analysis and pushover analysis are carried out on infilled frame models with the aid of the software SAP2000. Two typical single strut models and a typical three-strut model are used to simulate the panel of the frames respectively. It is indicated that the period reduction factor of the frame with a three-strut model is close to the value recommended by the current code. The infill wall has great… More >

  • Open Access

    ARTICLE

    Joint Time-Frequency Analysis of Seismic Signals: A Critical Review

    Roshan Kumar1,*, Wei Zhao1, Vikash Singh2

    Structural Durability & Health Monitoring, Vol.12, No.2, pp. 65-83, 2018, DOI: 10.3970/sdhm.2018.02329

    Abstract This paper presents an evaluation of time-frequency methods for the analysis of seismic signals. Background of the present work is to describe, how the frequency content of the signal is changing in time. The theoretical basis of short time Fourier transform, Gabor transform, wavelet transform, S-transform, Wigner distribution, Wigner-Ville distribution, Pseudo Wigner-Ville distribution, Smoothed Pseudo Wigner-Ville distribution, Choi-William distribution, Born-Jordan Distribution and cone shape distribution are presented. The strengths and weaknesses of each technique are verified by applying them to a particular synthetic seismic signal and recorded real time earthquake data. More >

  • Open Access

    ARTICLE

    Ductility and Ultimate Capacity of Concrete-Filled Lattice Rectangular Steel Tube Columns

    Chengquan Wang1, Yun Zou1,*, Tianqi Li1, Jie Ding1, Xiaoping Feng1, Tiange Lei1

    Structural Durability & Health Monitoring, Vol.12, No.2, pp. 99-110, 2018, DOI: 10.3970/sdhm.2018.02061

    Abstract A kind of concrete-filled lattice rectangular steel tube (CFLRST) column was put forward. The numerical simulation was modeled to analyze the mechanical characteristic of CFLRST column. By comparing the load-deformation curves from the test results, the rationality and reliability of the finite element model has been confirmed, moreover, the change of the section stiffness and stress in the forcing process and the ultimate bearing capacity of the column were analyzed. Based on the model, the comparison of ultimate bearing capacity and ductility between CFLRST column and reinforced concrete (RC) column were also analyzed. The results of the finite element analysis… More >

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