Saingam, Panumas

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Saingam, Panumas
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panumas.sa@kmitl.ac.th

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    Seismic Retrofit of RC Building with Elastic Stage of Buckling-Restrain Braces
    (2023-01-01)
    Thipprapan, Thanawat
    ;
    Jarasjarungkiat, Amphon
    ;
    Saingam, Panumas
    ;
    Petchsasithon, Arthit
    Seismic retrofit of a reinforced concrete (RC) building using a buckling-restrained brace is an innovative method to improve the seismic performance of the existing RC buildings to resist damage from the future earthquake. This research proposes a simple method to retrofit RC buildings with buckling-restrained braces (BRBs). A 4-story school reinforced concrete building in Thailand is selected as a target building. The analysis results of the existing RC building indicate that the structure cannot withstand the seismic force under the newest code, which was published in 2021. There were failures at the columns of the 1<sup>st</sup>–3<sup>rd</sup> floors, in which lateral displacements exceeded the current seismic design standard. After retrofitting the target building by the proposed method with BRBs, it was found that the lateral displacements are reduced and the target RC building can withstand the seismic demand of the newest code. Therefore, the retrofitted building can be resisted future earthquakes. This shows the effectiveness of the introduced retrofit method.
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    Response Control on Seismic Retrofit of Low-Rise RC Frame Using Viscous Damper
    (2023-01-01)
    Saingam, Panumas
    In recent years, seismic design and detailing requirements for buildings have considerably improved worldwide. For example, in Thailand, a new seismic design code was published in 2021, but many existing buildings do not satisfy the new code and require retrofit. The seismic retrofit is required to improve the seismic performance of the existing building. However, the response control method to control the target story drift ratio of the retrofitted RC buildings using the viscous damper is lack introduction. This study proposes a response control retrofit strategy using viscous dampers, designed using an equivalent linearization approach. A constant stiffness method is introduced to efficiently distribute the dampers along with the building height. The stiffness of the damper is equally distributed for all stories. A design example is introduced of a low-rise reinforced concrete school building in Thailand, which was damaged in the 2014 Mae Lao earthquake. Nonlinear response history analysis is used to validate the introduced method. The results indicate that the average peak story drifts ratios can be controlled within the target story drift ratio of 0.67% rad.
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    Seismic Retrofit of Shear Wall Medium-Rise RC Building with Buckling-Restrained Braces
    (2024-01-01)
    Hlaing, Hnin Hnin
    ;
    Suwannatrai, Rawirot
    ;
    Tammajak, Nontaphat
    ;
    Kriangkriatkong, Phusana
    ;
    Nakkahnong, Apisak
    Thailand was impacted by the earthquake both directly and indirectly. Many structures in Chiang Rai were damaged by the large Mae Lao earthquake in 2014. This makes the government recognize how crucial it is to develop earthquake-resistant structures for public safety. Structures in many locations are required to consider designing more earthquake-resistant structures due to calculations made regarding the building structure’s ability to ensure the earth-quake’s vibration. Several medium-rise buildings in Bangkok have been required to improve their seismic performance to fulfill the new standard and to protect them from future earthquakes. Therefore, this study investigates the validation of updated design code and efficiency of retrofitting an existing shear wall medium-rise RC building that was planned with seismic concern but not in accordance with more modern code regulations using buckling restrained braces (BRBs). In addition, the possible locations of retrofitting BRBs are investigated. A typical 36-story RC shear wall residential building in Bangkok is used as the target building. An equivalent linear static analysis is performed to investigate the seismic performance of the target building. The results indicate that the seismic performance of the retrofitted building with BRB is improved when compared to the non-retrofitted building, and the retrofitted shear wall medium-rise RC building with the damper location close to the shear wall is the most efficient when compared to other locations.
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    Reduction of Damage Concentration in Seismic Retrofitted RC Building with Friction Dampers
    (2024-01-01)
    Sirinipitakul, Terapat
    ;
    Suwannatrai, Rawirot
    ;
    Hlaing, Hnin Hnin
    ;
    Saingam, Panumas
    Because of their lack of lateral force resistance or energy dissipation capability, reinforced concrete (RC) structures have suffered significant damage in previous earthquakes. There is a demand to develop and improve the seismic performance of vulnerable existing RC buildings, particularly those not initially designed for seismic events or designed to an outdated seismic standard. Seismic retrofit of RC buildings using friction dampers is an innovative method to improve the seismic performance of the structures. In this study, nonlinear response history analysis was performed to investigate and compare the seismic performance of retrofitted buildings. The numerical results suggest that the maximum displacement was substantially improved after retrofitting the existing RC building with friction dampers. The damage concentration of the retrofitted buildings with friction dampers is reduced significantly when compared to the existing RC buildings.
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    Energy-dissipation in Seismic Retrofit RC Building with Friction Dampers
    (2023-09-06)
    Saingam, Panumas
    ;
    Sangswang, Nitikorn
    ;
    Sansombat, Pana
    Reinforced concrete (RC) buildings have suffered severe damage in the past due to inadequate lateral force resistance or energy dissipation capability. There is a need to improve the seismic performance of existing, vulnerable RC structures, particularly those that were either not initially intended for seismic effects or were planned to an obsolete seismic standard. Friction dampers are a revolutionary technique for improving lateral force resistance and energy dissipation capacity in the seismic retrofit of RC buildings. In this study, energy dissipation in seismically retrofitted RC buildings using friction dampers is investigated. An investigation of the nonlinear response history was performed after friction dampers were applied to the RC building. The analysis results indicate that the peak story drift ratios are reduced and constant throughout the height of the building, which may be a sign that the structure has not suffered soft story damage. In addition, the total friction damper's energy-dissipation is half of the total input energy.