Analisis Deviasi Geometri Struktur Bangunan Menggunakan Sensor LiDAR Berbasis Terrestrial Laser Scanning (Studi Kasus: Pondok Pesantren Assalafi Al-Fithrah, Surabaya)

Gani, Hilarius Bintang Tuwuhati (2026) Analisis Deviasi Geometri Struktur Bangunan Menggunakan Sensor LiDAR Berbasis Terrestrial Laser Scanning (Studi Kasus: Pondok Pesantren Assalafi Al-Fithrah, Surabaya). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Deviasi geometri elemen struktural seperti kelurusan kolom, kerataan dinding, dan keteraturan bidang merupakan salah satu pemicu awal kerusakan struktural, namun inspeksi lapangan konvensional menggunakan Total Station kurang mampu merepresentasikan bentuk struktur secara lengkap. Penelitian ini menganalisis deviasi geometri struktur Pondok Pesantren Assalafi Al Fithrah, Surabaya, menggunakan data point cloud dari pemindaian Terrestrial Laser Scanner (TLS), data rinex dari pengamatan GNSS, dan data jarak dan sudut menggunakan Total Station. Registrasi cloud-to-cloud dari 203 setup pemindaian menghasilkan error 0,002 m, georeferencing menghasilkan Absolute Mean Error of Control 0,009 m, dan uji akurasi model terhadap titik ICP menghasilkan RMSE 0,011 m (X), 0,025 m (Y), dan 0,006 m (Z) yang memenuhi toleransi yang ditetapkan. Analisis geometri menunjukkan ketidaksesuaian elevasi antar lantai dengan selisih terbesar 491 mm di Level 4, dimensi kolom yang konsisten lebih besar dari rencana dengan selisih terbesar +162 mm di Lantai 1, serta kemiringan kolom yang sebagian besar memenuhi toleransi ACI 117-10 kecuali Kolom K9 dengan kemiringan sebesar 16,5 mm. Sampel Balok 3 (balok pada grid 1, 2, 3, 4, 5, 7, 9, 15, dan 16) menunjukkan penurunan elevasi 20 mm yang melampaui toleransi ACI 117-10 (±19,05 mm). Berdasarkan akurasi posisi dan representasi geometrisnya, model 3D elemen struktural yang dihasilkan diklasifikasikan mencapai Level of Detail (LoD) 4. Hasil ini menunjukkan bahwa TLS efektif mengidentifikasi deviasi geometri secara kuantitatif dan objektif sebagai dasar evaluasi teknis dan mitigasi risiko bangunan.
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Geometric deviation in structural elements, such as column plumbness, wall flatness, and planar regularity, is an early trigger of structural damage, yet conventional field inspection using Total Station is less capable of representing structural form completely. This study analyzed the geometric deviation of the Pondok Pesantren Assalafi Al Fithrah building, Surabaya, using point cloud data from Terrestrial Laser Scanner (TLS) scanning, rinex data from GNSS observation, and distance and angle data from Total Station. Cloud-to-cloud registration of 203 scan setups produced an error of 0.002 m, georeferencing produced an Absolute Mean Error of Control of 0.009 m, and model accuracy testing against ICPs yielded RMSE values of 0.011 m (X), 0.025 m (Y), and 0.006 m (Z), all within the established tolerances. Geometric analysis revealed elevation discrepancies between floors with the largest difference of 491 mm at Level 4, column dimensions consistently larger than design with the largest difference of +162 mm at Floor 1, and column plumbness mostly within ACI 117-10 tolerance except Column K9 with a plumbness of 16.5 mm. Balok 3 (beams at grids 1, 2, 3, 4, 5, 7, 9, 15, and 16) showed an elevation deviation of 20 mm exceeding the ACI 117-10 tolerance (±19.05 mm). Based on positional accuracy and geometric representation, the resulting 3D model of structural elements was classified as achieving Level of Detail (LoD) 4. These results demonstrate that TLS effectively identifies geometric deviation quantitatively and objectively as a basis for technical evaluation and risk mitigation.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Terrestrial Laser Scanner (TLS), Point Cloud, Root-Mean-Square Error (RMSE), Deviasi Geometri, Analisis Struktural. Terrestrial Laser Scanner (TLS), Point Cloud, Root-Mean-Square Error (RMSE), Geometric Deviation, Structural Analysis.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA660.F7 Structural frames. T Technology > TA Engineering (General). Civil engineering (General) > TA681 Concrete construction
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29202-(S1) Undergraduate Thesis
Depositing User:	Hilarius Bintang Tuwuhati Gani
Date Deposited:	31 Jul 2026 07:44
Last Modified:	04 Aug 2026 01:18
URI:	http://repository.its.ac.id/id/eprint/140658

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