Long-Term Monitoring and Finite Element Analysis of The Pasana Chedi Wat Ratchapradit Sathimahasimaram Ratchaworawihan based on Terrestrial Laser Scanning data

This article presents the applications of three-dimensional laser scanning data for long-term monitoring and stability assessment using the finite element method of the Pasana Chedi, Wat Ratchapradit Sathimahasimaram Ratchaworawihan, Phra Nakhon district, Bangkok. This research collected digital data in the form of 3D point clouds over three sessions, from the year 2020 to 2022, to monitor and investigate changes in the condition of Wat Ratchapradit in the long term. The obtained data can be used to analyze the current dimensions and assess the leaning angles of the Pasana Chedi. The methodology is presented for applying point cloud data to create a three-dimensional model for assessing the stability of the Pasana Chedi using Abaqus software. The point cloud data analysis and the leaning angles of the Chedi did not reveal any significant changes during the study session. According to the stress distribution result of a structure caused by the self-weight of the Chedi, the maximum compressive stress and tensile stress are 0.237 MPa at Than Keang and 0.033 MPa at the floor inside the Chedi, respectively. In addition, a study was conducted on the mechanical property changes of materials that could affect the stress distribution, maximum displacement, and natural period, which might impact the stability of the Chedi. Finally, the methodology and results will benefit the future preservation of Wat Ratchapradit.