Abstract
Monitoring the deformation of objects in the natural disaster area is one of the anticipative steps to reduce losses. In this case, this is an attempt to implement mitigation for the safety and viability of the community. Until this time, many constraint factors in the process of obtaining information regarding the strength of the structure and the changes of shape and dimension (per time unit) of the objects, one of which is the high operational cost and the duration of data processing while using a conventional measuring instrument. Through this article, a fast, cheap, easy, and accurate alternative method to detect deformation of the bridge material structure due to flash flood is only by using a Digital Single Lens Reflex (DSLR) camera. The bridge’s structures were photographed and processed with proprietary software to obtain the retro-reflective coordinate of the target that has been evenly attached to the bridge surface as a reference point. From a series of periodic photoshoots conducted from July 2020 to July 2021, deformation of the bridge structure was successfully detected with a magnitude between 0.026 mm – 5.867 mm with a measurement accuracy level was 0.081 mm. With this measurement accuracy level, this system is able to detect the deformation of structures smaller than 0.1 mm, and even invisible deformation can still be detected. This article will explain the technique and methodology of deformation measurement quickly and accurately only with a DSLR camera.
Highlights
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Many constraint factors in the process of obtaining information regarding the strength of the structure and the changes of shape and dimension of the objects, one of which is the high operational cost and the duration of data processing while using a conventional measuring instrument
The bridge’s structures were photographed and processed with proprietary software to obtain the retro-reflective coordinate of the target that has been evenly attached to the bridge surface as a reference point
Summary
Sebagaimana diketahui bahwa bumi yang kita tempati tidak bersifat statis (tetap atau tidak berubah), namun selalu dinamis (berubah). Kerugian tersebut dapat diminimalkan melalui langkah antisipatif berupa upaya pemantauan deformasi pada objek di daerah bencana seperti Jembatan Pandansari. Terkadang daerah topografi di sekitar area pengukuran tidak memungkinkan untuk didirikan alat, sehingga pengukuran tidak bisa dilakukan, dan juga persoalan deformasi yang ditemukan yaitu objek jembatan yang bentuk dan dimensi nya tidak begitu besar sehingga metode Differential Interferometry Synthetic Aperture Radar (DINSAR) tidak dapat diterapkan. Berdasarkan uraian tersebut, kamera DSLR memiliki potensi yang besar untuk memberikan cara yang efektif dan efisien dalam proses analisa deformasi jembatan akibat banjir bandang, dalam hal ini memverifikasi bahwa deformasi yang terjadi masih berada dalam batas yang diharapkan atau untuk menilai apakah ada pemeliharaan lebih lanjut yang diperlukan pada jembatan tersebut setelah terjadinya bencana. Penelitian ini menjelaskan teknik monitoring deformasi jembatan dengan menggunakan kamera DSLR untuk memantau pergeseran posisi struktur jembatan hingga mencapai ketelitian fraksi milimeter
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