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Author: search.filters.author.Mehmood, TahirSubject: search.filters.subject.OpenSees

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    Collapse prevention of pre-stressed electric transmission poles using glass fiber reinforced polymers
    (2025-07-01)
    Parichatprecha, Rattapoohm
    ;
    Rodsin, Kittipoom
    ;
    Suthasupradit, Songsak
    ;
    Mehmood, Tahir
    ;
    Nawaz, Adnan
    Natural hazards such as strong winds, typhoons, and earthquakes have caused massive economic losses in the form of damage to residential and life-line structures. Electric transmission infrastructures are life-line structures susceptible to severe damage under lateral loads like wind and earthquakes. This study focused on vulnerability assessment and measures to reduce the expected damage to the prestressed electric transmission poles under lateral loads. The Glass Fiber Reinforced Polymer (GFRP) sheet is selected as a strengthening material because the fiber cost is affordable but still has acceptable high tensile strength. A full-scale 12-meter-long prestressed transmission pole was tested under reversed cyclic lateral loading. Furthermore, another specimen strengthened with the GFRP sheet was tested to quantify the effectiveness of this technique. The experimental results show significant improvement in the lateral response behavior of prestressed poles in terms of lateral drift capacity, ductility, and energy dissipation characteristics. The GFRP-strengthened specimen exhibited a significantly enhanced lateral drift capacity (more than 100 %) compared to the control specimen. The performance of GFRP in preventing the collapse of a full-scale transmission pole is proved experimentally in this study. Finally, a numerical model based on the fiber modeling concept was also implemented in the open-source platform OpenSees to simulate the observed hysteretic behavior for strengthened and unstrengthened prestressed electric transmission poles. The application of this strengthening method is shown to be very practical for collapse prevention of existing PC poles both in terms of performance and budget.
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    Experimental and numerical seismic assessment of non-ductile reinforced concrete (RC) columns strengthened with glass fiber reinforced polymer (GFRP)
    (2022-10-01)
    Rodsin, Kittipoom
    ;
    Mehmood, Tahir
    ;
    Kolozvari, Kristijan
    ;
    Nawaz, Adnan
    ;
    Samiullah, Qazi
    This study presents an experimental and numerical seismic evaluation of non-ductile reinforced concrete (RC) columns strengthened with glass fiber reinforced polymer (GFRP). Three RC column specimens exhibiting three different modes of failure, flexure, flexure-shear, and shear, were strengthened with locally available, inexpensive GFRP sheets and subjected to reversed cyclic loading. The results showed that GFRP sheets not only enhanced the ductility capacity of non-ductile RC columns but also helped to shift the undesirable shear and flexure-shear mode of failure to a more favorable flexural mode. A numerical model based on the multiple-vertical-line-element-model was also proposed and implemented in OpenSees to simulate the experimentally tested specimens. This simple yet robust model was successful in predicting the force–deformation response, including strength degradation of the tested specimens.