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Work volume calculations are essential for project cost estimation. Many projects, such as the Laboratory Building of the Faculty Engineering at Tanjungpura University, calculate work volumes conventionally. Conventional calculation considered less efficient and prone to errors. Building Information Modeling (BIM) provides a solution that produces more accurate and efficient calculations than conventional methods. This research aims to compare structural work volume results produced by BIM using Autodesk Revit against conventional methods and project’s BOQ. This research also describes the benefits and challenges of BIM implementation based on the researcher’s experience applying BIM with Autodesk Revit in work volume calculation. The comparison between BIM and conventional method shows a maximum difference of 2% across all work items. Meanwhile, the comparison between BIM and the BOQ shows significant differences: 81% in column formwork area, 24% in grade beam/beam concrete volume, 25% in column reinforcement weight, 25% in steel beam weight, and 10% in the steel plate weight. This research proves that BIM implementation produces more accurate and efficient calculations and serves as an effective BOQ cross-check tool. Based on the researcher’s experience in implementing BIM with Autodesk Revit, challenges found in procurement aspects, modeling aspects, and model dependency on reference drawings.    

This study examines the application of double integrals in calculating the volume of cylindrical concrete piles as a basis for estimating material requirements in building foundation structures. The volume calculation was carried out using a double-integral approach in polar coordinates for three pile segments with lengths of 4 m, 3.9 m, and 4 m, each having a diameter of 60 cm. The results were then validated using the standard geometric formula to ensure consistency and mathematical reliability. The obtained concrete volume was subsequently used to estimate material needs based on a 1:1.5:3 mix proportion consisting of cement, sand, and gravel. The findings indicate that double integrals can be effectively applied to generate accurate estimations of both volume and material requirements, supporting logistical planning in construction. This approach also highlights the strong connection between mathematical concepts—particularly multivariable calculus—and practical applications in civil engineering. Furthermore, the study emphasizes that double integrals may serve as a relevant alternative when structural modeling requires deeper analytical exploration or validation beyond conventional geometry. Therefore, the implementation of double integrals not only reinforces theoretical understanding but also enhances precision in evaluating structural components within building foundation planning.

Penelitian ini bertujuan untuk mengevaluasi implementasi Tingkat Komponen Dalam Negeri (TKDN) pada pekerjaan elektrikal proyek konstruksi bangunan gedung pemerintah di Indonesia. Metode yang digunakan adalah pendekatan kuantitatif deskriptif–evaluatif melalui studi kasus pada delapan lokasi proyek pemerintah. Evaluasi dilakukan terhadap capaian TKDN pada pekerjaan MVMDP, LVMDP, pemasangan kabel, pencahayaan, genset, trafo distribusi, dan biaya transportasi berdasarkan dokumen kontrak dan ketentuan regulasi yang berlaku. Hasil penelitian menunjukkan bahwa capaian TKDN antar proyek sangat bervariasi, dengan kecenderungan nilai TKDN rendah pada komponen berteknologi tinggi dan proyek di luar Pulau Jawa. Temuan ini mengindikasikan bahwa keterbatasan material lokal dan ketimpangan distribusi industri menjadi tantangan utama dalam implementasi TKDN. Penelitian ini memberikan kontribusi empiris dalam mengevaluasi kebijakan TKDN pada pekerjaan elektrikal serta menjadi dasar rekomendasi kebijakan peningkatan TKDN yang lebih terarah.

This research examines the implementation of green building principles in the design of the Multipurpose Building at SMP–SMA Islam Hidayatullah Semarang, focusing on energy-efficient strategies and spatial comfort based on the GREENSHIP GBCI certification criteria. The study employs a qualitative descriptive method through interviews with the architect, analysis of architectural drawings, interpretation of interior design visualizations produced by Falana Studio, and literature review on sustainable building design. The findings indicate that the building consistently applies passive design strategies, including the optimization of natural lighting through large openings and a central void, the application of cross-ventilation on each floor, and the integration of façade vegetation that reduces surface temperature and improves microclimate performance. Material selection such as GRC panels, HPL, and modular plywood supports long-term durability, while the interior design demonstrates strong visual comfort and ergonomic quality through indirect lighting, neutral color schemes, and activity-based furniture layout. According to the GREENSHIP assessment categories, the building fulfills Energy Efficiency and Conservation (EEC), Indoor Health and Comfort (IHC), Material Resources and Cycle (MRC), and Appropriate Site Development (ASD) criteria. In conclusion, the Multipurpose Building successfully integrates green building principles as an effective approach to energy efficiency and the enhancement of the educational environment.

The construction of the Manado Student Dormitory (AMN) is one of the President's priorities, the construction of which is based on PP No. 106 of 2021. The aim of building the AMN is so that students from various regions studying in North Sulawesi can interact with each other and get to know and respect each other's cultures. After the pre-construction meeting (PCM) was carried out, the service user instructed that acceleration be made by shortening the implementation time. To implement these instructions, PT. Widya Satria implemented the BIM (building information modelling) system to accelerate the work, by modelling the construction phase starting from BIM 3D (modelling), BIM 4D (scheduling), and BIM 5D (quantity take off). Accelerating work is carried out by applying the fast track method so that any work that has a long critical path time can be shortened by overlapping work between one stage and another that can be done together. The implementation results simulate that the work can be completed faster than the contract time with a workforce requirement of 296 people, 1 (one) tower crane unit, and 1 (one) mobile crane work unit, even after implementing BIM in the construction of AMN Manado, all stakeholders It is easy for the holder to coordinate and control work progress.

Penelitian ini bertujuan mengembangkan sistem informasi keberadaan dosen dan karyawan di Gedung Elektro Politeknik Negeri Bengkalis menggunakan metode face recognition berbasis Haar Cascade untuk deteksi wajah dan Local Binary Pattern Histogram (LBPH) untuk klasifikasi wajah. Sistem memanfaatkan ESP32-CAM sebagai perangkat akuisisi citra dan aplikasi Python untuk antarmuka grafis (GUI) secara real-time. Pengujian dilakukan pada variasi jarak (0,5 m, 1 m, dan 2 m) serta kondisi pencahayaan (terang, sedang, gelap). Hasil menunjukkan akurasi deteksi wajah rata-rata mencapai 83%, dengan pencahayaan terang dan sedang menghasilkan akurasi 100%, sedangkan kondisi gelap turun hingga 50%. Akurasi pengenalan wajah rata-rata sebesar 60%, dengan rincian 92% pada jarak 0,5 m, 50% pada 1 m, dan 33% pada 2 m. Hasil ini menunjukkan bahwa sistem mampu memberikan informasi keberadaan cdosen dan karyawan secara real-time, meskipun kinerja masih terbatas oleh kualitas kamera 2 MP, kondisi pencahayaan, dan jumlah dataset terbatas. Penelitian ini memberikan kontribusi pada implementasi monitoring keberadaan berbasis face recognition di lingkungan kampus serta menjadi dasar pengembangan lebih lanjut dengan kamera resolusi tinggi, metode deep learning, dan integrasi sistem absensi.

Perhitungan daya dukung pondasi yang akurat menjadi aspek penting dalam memastikan stabilitas dan keamanan struktur bangunan secara keseluruhan. Penelitian ini bertujuan untuk membandingkan nilai daya dukung ultimit (Qu) dari pondasi bored pile dengan menggunakan empat pendekatan berbeda, yaitu perhitungan manual menggunakan metode Schmertmann & Nottingham, Mayerhoff (1976), software Allpile, serta hasil uji lapangan dengan PDA (Pile Driving Analyzer). Studi kasus dilakukan pada proyek pembangunan Gedung Fave Hotel yang terletak di Banyumanik, Semarang. Hasil analisis menunjukkan bahwa metode Schmertmann & Nottingham dengan nilai Qu tertinggi sebesar 282,25 ton. Sedangkan nilai terendah berasal dari hasil uji PDA 159,61 ton. Metode Mayerhoff (1976), memberikan nilai sebesar 170,30 ton, sementara Allpile menghasilkan nilai 160,79 ton. Selisih nilai ini disebabkan oleh perbedaan pendekatan dan asumsi yang digunakan oleh masing-masing metode. Secara umum, hasil PDA dianggap paling merepresentasikan kondisi aktual di lapangan karena merupakan hasil uji dinamis langsung pada tiang. Oleh karena itu, pendekatan manual dan software Allpile dapat dijadikan sebagai estimasi awal dalam tahap desain, namun tetap perlu divalidasi melalui pengujian lapangan untuk memperoleh hasil yang lebih realistis dan dapat diandalkan.

Penelitian ini bertujuan untuk menganalisis perbandingan biaya dan durasi proyek sebelum dan sesudah penerapan metode crashing pada pembangunan Gedung Kenanga di Rumah Sakit Paru dr. Ario Wirawan (RSPAW) Kota Salatiga. Metode crashing dilakukan dengan mempercepat aktivitas pada lintasan kritis melalui penambahan sumber daya tanpa mengurangi kualitas pekerjaan. Berdasarkan hasil analisis, durasi proyek berkurang dari 150 hari menjadi 124 hari (efisiensi waktu sebesar 17%). Biaya langsung mengalami peningkatan sebesar 1,11%, sedangkan biaya tidak langsung menurun sebesar 17,33%. Secara keseluruhan, metode crashing menghasilkan penghematan total biaya proyek sebesar 0,74%. Temuan ini menunjukkan bahwa metode crashing dapat menjadi strategi efektif dalam percepatan proyek dengan pengendalian biaya yang optimal. Kata kunci: crashing, lintasan kritis, biaya proyek, durasi proyek, percepatan.

Given the great benefits of electrical energy, the availability of electrical energy sources is limited. Currently, the availability of electrical energy sources is not able to meet the increasing demand for electricity in Indonesia. The high use of electrical energy in daily life will have a negative impact on the environment. Therefore, to maintain the sustainability of energy sources, it is necessary to pursue strategic steps that can support the provision of electrical energy optimally and affordably, This study aims to find out how much total energy is used by the Energy Consumption Index (IKE) on electrical energy from the influence of electrical power and the length of time of use of electrical energy at SMK Negeri 2 Lubuk Basung, Lubuk Basung District, Agam Regency. This study aims to determine the value of energy consumption used or Energy Consumption Index (IKE) and energy saving opportunities at SMK Negeri 2 Lubuk Basung, Lubuk Basung District, Agam Regency. The results of this study are for the IKE value of the first floor which is 1.71 kWh/m2, for the IKE value of the second floor which is 0.03 kWh/m2, for the IKE value of one building, which is with a value of 1.74 kWh/m2, for the annual IKE of 0.022 kWh/m2/year and for the value of energy-saving opportunities of IDR 651 646/month IDR 7 819 755/year.

This study examines the legal protection provided to holders of Building Use Rights (HGB) on land under Management Rights (HPL) as interpreted in Supreme Court Decision No. 2160 K/Pdt/2017. The research aims to understand how civil law is applied to ensure legal certainty for HGB holders on HPL land and to strengthen insight into civil law principles used in resolving land-rights disputes. In the juridical context, land refers to the earth’s surface, while land rights are defined as authority over a specific, limited portion of that surface. Legal certainty, based on written regulations implementing the Basic Agrarian Law No. 5 of 1960, provides clarity regarding the rights and obligations of parties who own or control land. The study was conducted at the Sragen Police Resort using documentation methods—reviewing legal texts, literature, and supporting materials—along with field data obtained through interviews with relevant officers and individuals familiar with the case. The findings show that the Judex Facti of the West Java High Court made an error by declaring that no new issues required examination without giving adequate legal reasoning. The court also failed to address the objections submitted by the appellant, violating Article 50 paragraph (1) of Law No. 48 of 2009 on Judicial Power. Consequently, the Supreme Court annulled the previous decision, clarifying the legal consequences and strengthening the interpretation of HGB status on HPL land.

The Indonesian Naval Academy (AAL) as a military educational institution requires a large electricity supply to support its operational activities, including in the Sapudi Building of the Engineering Department. This study aims to design a solar energy system to supply the electricity needs for lighting in the building. The method used is Research and Development (R&D) with the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). Data collection was conducted through direct observation of building conditions, electrical equipment, and solar radiation intensity data in Surabaya. The research results show that the total electricity requirement for lighting in the Sapudi Building is 4.686 kW with a total of 143 lights (96 neon lights and 47 light bulbs). Based on calculations with an average solar radiation of 5.00 kWh/m²/day, the designed system requires 41 units of Solar PV Lesso HPM 550W panel type with 21.3% efficiency and 9 units of Panasonic LC-P12100NA batteries with a capacity of 100Ah arranged in 3 series and 3 parallel configurations. This study proves that the utilization of solar energy can be an efficient and sustainable alternative solution to reduce dependence on conventional electricity in the AAL environment, while supporting the implementation of renewable energy in Indonesian military institutions.

Beban gempa merupakan representasi dari beban statik ekuivalen yang diaplikasikan pada seluruh bagian struktur bangunan atau pada bagian tertentu, dengan tujuan menirukan efek gerakan tanah akibat aktivitas seismik. Di antara berbagai metode analisis, analisis time history dikenal sebagai teknik yang paling presisi dalam memprediksi respons struktur terhadap gempa. Namun, penerapan metode ini memerlukan proses perhitungan yang kompleks dan cukup menyita waktu. Untuk menyederhanakan proses tersebut, digunakan pendekatan analisis statik ekuivalen, yang terbukti cukup efektif, khususnya pada struktur bangunan yang bersifat simetris. Prosedur perhitungan dalam metode ini mencakup evaluasi gaya geser serta simpangan antar lantai, dengan studi kasus berupa gedung perkantoran yang berlokasi di Kota Semarang. Perangkat lunak SAP2000 dimanfaatkan sebagai alat bantu dalam melakukan analisis tersebut. Berdasarkan hasil analisis, gaya geser dan simpangan antar lantai yang diperoleh telah sesuai dan memenuhi ketentuan yang ditetapkan dalam standar SNI 1726:2019 untuk bangunan gedung.

Bangunan yang berada di daerah rawan gempa dengan tanah lunak cenderung memiliki tingkat kerentanan yang lebih tinggi. Dalam merancang struktur bangunan bertingkat, beban gempa menjadi salah satu parameter utama yang sangat berpengaruh. Kekuatan sebuah bangunan ditentukan oleh elemen-elemen struktur yang menopangnya dan kolom merupakan elemen struktur yang memiliki peran penting dalam konstruksi. Jika kolom mengalami kegagalan, bangunan yang ditopangnya berpotensi runtuh. Oleh karena itu, rendahnya ketahanan konstruksi di wilayah ini tetap menjadi permasalahan yang sedang diteliti saat ini. Tujuan penelitian ini untuk mengetahui seberapa jauh pengaruh variasi dimensi kolom terhadap struktur bangunan terhadap gempa, sehingga diperoleh ukuran dimensi kolom yang paling optimal. Pada penelitian ini, objek yang digunakan adalah bangunan 8 lantai yang terdiri dari lantai 1-3 merupakan kantor dan lantai 4-8 merupakan hunian. Pada perencanaan ulang bangunan ini berpedoman pada persyaratan beton struktural (SNI 2847:2019), perencanaan ketahanan gempa (SNI 1726:2019), dan beban minimum untuk perancangan bangunan gedung dan struktur lain (SNI 1727:2020), dengan pemodelan menggunakan software ETABS V.22. Redesain bangunan ini untuk mengetahui ukuran dimensi kolom yang paling optimal. Hasil penelitian perubahan dimensi kolom terhadap kekuatan struktur bangunan yakni dengan memperbesar dimensi kolom, kapasitas penampang bertambah yang dapat meningkatkan ketahanan kolom terhadap beban gempa. Selain itu, dimensi yang lebih besar juga membantu mengurangi tegangan aksial pada kolom, sehingga menurunkan risiko kegagalan akibat tegangan berlebih atau kelelahan material. Semakin besar dimensi kolom yang digunakan maka semakin kecil nilai simpangan yang dihasilkan. Artinya dengan dimensi kolom yang lebih kecil memiliki resiko yang lebih tinggi, sebab nilai simpangan lebih dekat dengan batas yang diijinkan. Akan tetapi hasil analisis menunjukkan bahwa dimensi kolom dengan berbagai variasi masih aman dari pengaruh delta izin.

Penelitian ini menganalisis kekuatan pondasi tiang pancang pada proyek pembangunan Apartemen Arjuna Bima di Kabupaten Sleman. Penyidikan tanah menggunakan boring pada titik B2 menunjukkan bahwa lapisan tanah keras maksimum berada pada kedalaman 25 meter, sementara hasil bor tangan mengidentifikasi tanah berupa pasir sedang berwarna coklat keabu-abuan. Tiang pancang dipilih karena kemampuannya untuk memadatkan tanah pasir sedang selama proses pemancangan. Penelitian ini menggunakan metode kuantitatif dengan teknik pengumpulan data sekunder melalui studi literatur dan dokumentasi. Semua perhitungan dilakukan menggunakan metode Meyerhof, sedangkan analisis pembebanan struktur dilakukan dengan perangkat lunak ETABS v22. Analisis ini mencakup perhitungan kapasitas dukung aksial, kapasitas dukung lateral, dan penurunan pondasi akibat beban struktur atas. Hasil analisis menunjukkan bahwa beban aksial (P) sebesar 710,77 ton. Kapasitas dukung aksial kelompok tiang pancang (Qg) dengan diameter 80 cm, 60 cm, dan 42,9 cm pada kedalaman 20 m berturut-turut adalah 2.125,87 ton; 1.347,68 ton; dan 710,51 ton. Kapasitas dukung lateral (Hg) untuk ukuran tiang yang sama berturut-turut adalah 1.169,9 ton; 877,4 ton; dan 627,4 ton. Penurunan pondasi kelompok tiang (Sg) masing-masing adalah 2,46 cm; 2,1 cm; dan 2,03 cm. Berdasarkan hasil analisis, pondasi tiang pancang dengan diameter 80 cm dan 60 cm memenuhi syarat keamanan baik dari segi kapasitas dukung aksial maupun lateral, serta penurunan pondasi. Namun, untuk tiang pancang dengan diameter 42,9 cm, kapasitas dukung aksial tidak memenuhi syarat keamanan (Qg < P), sehingga tidak direkomendasikan untuk digunakan.

Bangunan gedung hijau merupakan salah satu pendekatan dalam sektor konstruksi yang menekankan efisiensi energi, konservasi sumber daya, dan pengurangan dampak lingkungan. Namun, pemahaman terhadap konsep bangunan hijau di kalangan masyarakat konstruksi masih relatif rendah. Program ini bertujuan untuk memberdayakan 25 tukang bangunan dan 25 pengrajin batu bata di Penggaron Kidul dari tiga aspek utama: aspek produksi, aspek manajemen, dan aspek pemasaran. Metode yang digunakan adalah deskriptif kualitatif dengan pendekatan partisipatif.  Hasil program menunjukkan bahwa kelompok tukang bangunan mengalami peningkatan kualitas produk 88%, peningkatan pembuatan bisnis plan 80%, peningkatan merancang strategi pemasaran 84%, 5 inovasi produk konstruksi hijau, dan 8 teknologi diterapkan, sedangkan kelompok pengrajin bata mengalami peningkatan diversitas produk 91%, peningkatan kemampuan pembukuan usaha 86%, peningkatan target pasar 82%, 5 inovasi bata hijau, dan 7 teknologi diterapkan.

Delays in high-rise building construction projects in Surabaya are a crucial issue as they can significantly affect cost, quality, and project completion schedules. This reserach intends to identify the dominant factors contributing to project delays using the Relative Importance Index (RII) method, considering both frequency and impact aspects. Data were obtained from 80 valid respondents who hold strategic roles in construction project implementation, such as Project Managers, Site Managers, Site Engineers, Estimators, Field Supervisors, General Managers, and Company Directors. The analysis results indicate that in terms of frequency, the dominant factors are unfavorable weather conditions (RII = 0.750), labor shortages (RII = 0.743), and design changes during construction (RII = 0.735). Meanwhile, in terms of impact, the dominant factors are delays in material delivery (RII = 0.780), labor shortages (RII = 0.770), and substandard material quality (RII = 0.740). These findings emphasize that labor shortage consistently influences project delays in both frequency and impact, while weather and material factors show different patterns between occurrence and consequence. All dominant factors were classified into the High-Medium category, indicating that they should be prioritized in project risk management.

In the development of a construction project, cost control is very important in the process of managing project costs. Many problems will be encountered in a construction project such as wasteful use of materials, unskilled labor and late completion of the project. This causes waste of costs that do not match the specified budget. In the construction project of the Rectorate of the Sorong City Health Polytechnic building, a budget of Rp. 36,570,996,788.55 is required. This study aims to make savings on previously planned costs, in addition to knowing the comparison of total project costs after analysis. The method used in this study is the Value Engineering method. The Value Engineering method is a method used to identify and eliminate unnecessary activities or reduce costs without reducing function. There are 4 stages of the work plan in this method, namely: Information Stage, Creative Stage, Analysis Stage, and Recommendation Stage. After conducting the Value Engineering analysis, savings of Rp. 654,875,786.25 or 1.79% of the total project cost were obtained. The analysis was conducted on the two highest-cost work items: wall and floor work. For the wall work, it was recommended that the HPL wall covering be replaced with plasterboard, while for the floor work, it was recommended that the 60x60 granite be replaced with 60x60 ceramic tiles.

The implementation of risk management is an important method that is carried out in order to identify risk factors that may arise during the implementation of the project. However, the implementation of risk management still faces some obstacles in its implementation. Therefore, this study aims to analyze the barriers to the implementation of risk management in construction projects in Surabaya. A total of 80 respondents filled out questionnaires from construction service providers including contractors and consultants. Respondents involved include professional experts such as Project Managers, Site engineers, Site managers, implementers, estimators, General Managers and Company Directors. Data processing using fuzzy AHP method as a data processing tool and decision making. The results of the study revealed that the main factors that can hinder the implementation of cost risk management are inaccurate cost estimates (Y4) with the highest weight of 0.433, lack of quality Control (Qc) supervision criteria (Y5) is ranked second with a weight of 0.288, poor coordination between stakeholders (owner,contractor and consultant) (Y1) is ranked third with a weight of 0.274, lack of risk management training (Y3) is ranked fourth with a weight of 0.005, and some, old age) (Y2), the work can not be done according to the work drawings (Y6), limited skilled human resources (Y7), materials not according to specifications (Y8), improper initial cost estimation (Y9), late progressive payment from the owner (Y10) ranked fifth jointly because it has an equivalent weight value of 0.These findings conclude that accurate cost estimation (Y4) is very important in construction projects because it becomes the main basis in budget planning, decision making, and risk management.

Advancements in information technology have created significant opportunities for more efficient spatial data management, including the mapping of government buildings. To support this effort, this study develops a web-based geographic information system for mapping government buildings in Bandung City using Leaflet.js. The system aims to facilitate interactive map visualization and provide more accurate and structured access to spatial data. The Agile method is applied in the system development process, consisting of six main stages: needs identification, design, development, testing, implementation, and evaluation. The system is designed using the Laravel or CodeIgniter framework as the backend and Leaflet.js for dynamic spatial data presentation. The research results indicate that the system can display geographic information accurately and interactively while supporting search, filtering, and responsive map display features across various devices. Additionally, the Agile approach has proven to enhance development efficiency and user experience. With this system, the government can manage building data more effectively, transparently, and efficiently to support planning and decision-making based on spatial data.

Working at heights refers to performing tasks in elevated locations, which pose a risk of injury to workers in the event of a fall. To reduce the number of accidents caused by working at heights, one of the necessary steps is conducting hazard and risk assessments using the Job Safety Analysis (JSA) method. JSA is an analytical method used to identify hazards at the workplace and find ways to reduce the risks of accidents. The purpose of this study is to assess the completeness of safety equipment for working at heights, to explain hazard identification, to analyze risks in building structure work, to determine criteria and hazard assessments, and to understand risk control in building structure, plumbing, and electrical work according to the Job Safety Analysis (JSA) method in healthcare facility buildings in Semarang. The results of the study show that the risk level, calculated using the Risk Rating Number (RRN), for all potential hazards in structure, plumbing, and electrical work, reveals the following: for structure work, three hazards fall into the extreme category (43.84%), one hazard falls into the high category (16.44%), four hazards fall into the medium category (39.73%), and no hazards fall into the low category (0%); for plumbing work, three hazards fall into the extreme category (38.55%), one hazard falls into the high category (14.46%), five hazards fall into the medium category (46.99%), and no hazards fall into the low category (0%); and for electrical work, three hazards fall into the extreme category (44.74%), three hazards fall into the high category (31.58%), three hazards fall into the medium category (21.05%), and one hazard falls into the low category (2.63%).