Home / Journals / SDHM / Vol.5, No.4, 2009
  • Open Access

    ARTICLE

    Theoretical Time Evolution of Critical Chloride Content in Concrete

    I.S. Yoon1, E.A.B. Koenders2
    Structural Durability & Health Monitoring, Vol.5, No.4, pp. 275-294, 2009, DOI:10.3970/sdhm.2009.005.275
    Abstract The critical chloride content for corrosion initiation is a crucial parameter in determining the durability and integrity of reinforced concrete structures, however, the value is still ambiguous. Most studies reporting the critical threshold of the chloride content have involved experimental measurements of the average amount of the total chloride content at an arbitrary time. Although carbonation can significantly impact on critical threshold chloride content, the majority of the researches have not dealt with this issue in combination with carbonation of concrete. Furthermore, many studies have tried to define the critical chloride content within the scope of their experimental concrete mix… More >

  • Open Access

    ARTICLE

    Development of a Portable Integrated Wireless Sensor Module for Structural Damage Monitoring

    Ramana M. Pidaparti1, Ashwin Belle2, Ju Wang3
    Structural Durability & Health Monitoring, Vol.5, No.4, pp. 295-310, 2009, DOI:10.3970/sdhm.2009.005.295
    Abstract This paper presents the development of a portable integrated wireless sensor module with video camera and ultrasound capabilities to monitor and investigate corrosion damage "in" structures. There are many studies in the literature on structural health monitoring with various sensors systems. However, very few of them utilize low power devices with reliable wireless communication capability to support data-intensive sensing which is a critical issue for practical applications. In this study, we developed a wireless sensor module with video camera capabilities and integrated it with a damage analysis module to investigate the damage of a structure. The module provides an open… More >

  • Open Access

    ARTICLE

    A Strain-Based Constitutive Model for Concrete under Tension in Nonlinear Finite Element Analysis of RC Flexural Members

    Smitha Gopinath1, J. Rajasankar1,2, Nagesh R. Iyer1, T. S. Krishnamoorthy1, B.H.Bharatkumar1, N. Lakshmanan1
    Structural Durability & Health Monitoring, Vol.5, No.4, pp. 311-336, 2009, DOI:10.3970/sdhm.2009.005.311
    Abstract In this paper, a two-phase strain-based constitutive model is proposed for concrete under tension. First phase deals with modelling uncracked concrete while the behaviour of concrete in cracked condition is modelled in second phase with appropriate theoretical support. A bilinear tension softening curve of concrete defined in crack width-stress space is taken as the basis to propose the model. Smeared representation of reinforcement and cracks along with multi-layered geometry definition of reinforced concrete (RC) structures is used to implement the model. Through this, it is shown that change in the orientation of tensile cracks with increasing load on the structure… More >

  • Open Access

    ARTICLE

    The Residual Stress State Due to Machining of Turbine Components: Experimental Investigation

    M. Lavella1, T. Berruti1
    Structural Durability & Health Monitoring, Vol.5, No.4, pp. 337-350, 2009, DOI:10.3970/sdhm.2009.005.337
    Abstract Results of residual stress measurements on Inconel 718 turbine components after machining are here presented. The work is focused on the experimental detection of the residual stress state produced after turning (orthogonal cutting and standard) and milling. The aim of the experimental activity was to supply an experimental data base of proved reliability for milling and turning model validation. This activity was performed inside the EU STREP project VERDI. The residual stresses were detected by means of X-ray diffraction technique. The experimental plan of measurements was performed on components worked with different working parameters (cutting velocity and feed rate) and… More >

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