Analisis Geometri Kaki Prisma Heksagonal Terhadap Packing Density Dan Efektivitas Interlocking Pada Unit Hexabits Dengan Variasi Kemiringan

Abraham, Michael Edgar (2026) Analisis Geometri Kaki Prisma Heksagonal Terhadap Packing Density Dan Efektivitas Interlocking Pada Unit Hexabits Dengan Variasi Kemiringan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia sebagai negara kepulauan menghadapi risiko abrasi dan erosi pantai yang tinggi akibat kenaikan muka air laut dan gelombang ekstrem. Dalam rekayasa pantai, penggunaan struktur pemecah gelombang (breakwater) dengan lapis lindung tunggal (single-layer) menjadi tren global karena efisiensi volume beton dan biaya konstruksi yang signifikan dibandingkan sistem konvensional. Namun, efektivitas unit single-layer sangat bergantung pada stabilitas kuncian mekanis (interlocking). Geometri kaki persegi konvensional sering kali menghadapi masalah konsentrasi tegangan tinggi dan keterbatasan bidang kontak antar unit, sementara ketergantungan pada unit paten asing meningkatkan beban biaya royalti dalam pembangunan infrastruktur nasional. Penelitian ini bertujuan untuk menganalisis pengaruh inovasi geometri kaki prisma heksagonal pada unit Hexabits terhadap nilai packing density, efektivitas coverage ratio, dan kekuatan kuncian statis pada variasi kemiringan lereng. Metodologi penelitian yang digunakan adalah pengujian model fisik eksperimental secara kering (dry placement test) menggunakan miniatur beton hasil cetakan silikon yang presisi. Pengujian dilakukan pada variasi kemiringan lereng 2V:3H dan 3V:4H dengan metode penataan teratur dan acak. Analisis data dilakukan melalui perhitungan matematis untuk packing density, analisis citra digital menggunakan AutoCAD untuk mengukur coverage ratio, serta tilt table test untuk menentukan stabilitas statis melalui sudut miring kritis (α_cr). Hasil pengujian ini diharapkan dapat membuktikan bahwa modifikasi geometri kaki heksagonal mampu meningkatkan probabilitas pertemuan bidang datar (surface-to-surface contact), sehingga menghasilkan kuncian yang lebih stabil dan luas tutupan yang lebih rapat dibandingkan unit berkaki persegi standar. Secara praktis, penelitian ini memberikan kontribusi berupa database parameter desain primer bagi unit Hexabits sebagai solusi lapis lindung beton lokal yang inovatif, efisien, dan mandiri guna mendukung perlindungan wilayah pesisir di Indonesia.
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As the world's largest archipelagic nation, Indonesia faces significant risks of coastal abrasion and erosion due to rising sea levels and extreme wave dynamics. In coastal engineering, the implementation of single-layer armor systems for breakwater structures has become a global trend due to its superior efficiency in concrete volume and lower construction costs compared to conventional double-layer systems. However, the effectiveness of single-layer units depends heavily on mechanical interlocking stability. Conventional square-leg geometries often encounter issues with high stress concentrations and limited contact area between units, while a persistent dependency on foreign-patented units increases royalty cost burdens for national infrastructure development. This research aims to analyze the influence of innovative hexagonal prism leg geometry in Hexabits units on packing density, coverage ratio effectiveness, and static interlocking strength across various slope gradients. The research methodology employs experimental physical modeling through dry placement tests using precision concrete miniatures produced from silicone molds. Testing is conducted on 2V:3H and 3V:4H slope gradients utilizing both regular and random placement methods. Data analysis is performed through mathematical calculations for packing density, digital image analysis via AutoCAD to measure the coverage ratio, and tilt table tests to determine static stability through the critical tilt angle (α_cr). The experimental results are expected to demonstrate that the hexagonal leg geometry increases the probability of surface-to-surface contact, thereby creating a more stable interlocking network and tighter coverage compared to standard square-leg units. Practically, this study contributes a primary design parameter database for Hexabits as an innovative, efficient, and independent local concrete armor solution to support coastal protection in Indonesia.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Breakwater, Hexabits, interlocking, packing density, tilt table test.
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC333 Breakwaters
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Michael Edgar Abraham
Date Deposited:	04 Aug 2026 07:29
Last Modified:	04 Aug 2026 07:29
URI:	http://repository.its.ac.id/id/eprint/143248

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