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This study analyzes a 10-floor multi-story lecture building in Lombok, focusing on the impact of concrete quality degradation on the building's performance. Due to limited material access, the actual on-site concrete quality changed from the design quality of fc 30 MPa to fc 24.9 MPa. The building structure was modeled in 3D using ETABS v22 software, and two structural models were compared: one with the design concrete quality (fc' 30 MPa) and one with the actual quality (fc' 24.9 MPa). The analysis evaluated dynamic performance, inelastic displacements, P-Delta effects, and reinforcement requirements. The comparison aimed to assess the impact of concrete degradation on structural stiffness, inter-story displacements, and reinforcement needs. The results show that concrete quality deterioration increases the structure's vibration period, inelastic displacement, and lateral forces due to P-Delta effects. While beam reinforcement requirements remain mostly unchanged, column reinforcement significantly increases, especially in columns with large axial forces. This study provides valuable insights into the technical consequences of concrete quality degradation and serves as a reference for evaluating structural redesigns in projects facing material limitations.

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.

Indonesia, a country located in the Pacific Ring of Fire, has a high level of vulnerability to earthquakes. This condition demands an increase in the capacity of civil engineering human resources to design safe and disaster-resistant buildings. This study aims to evaluate the effectiveness of project-based learning training with a focus on the application of SNI 1726:2019, structural modeling using ETABS/RSA, lateral load calculations, and the design of simple earthquake-resistant houses. The research method involved final-year civil engineering students and alumni who participated in a series of trainings, with evaluations through pre-tests, post-tests, and design assessments. The results showed an increase in competency in all aspects, especially the understanding of the SNI 1726:2019 standard and lateral load calculations. In addition, participants were able to produce simple house designs that meet the basic criteria for earthquake resistance, material efficiency, and structural stability. These findings indicate that applied training can bridge the gap between academic theory and practical skills needed in the workplace. This research contributes to strengthening the capacity of civil engineering in supporting resilient infrastructure development and has important implications for the integration of similar training into higher education curricula and community service programs.

The Nurul Ikhlas Mosque, also known as Surau Parak Mujua, located in Pakan Akek, Jorong Kajai, Nagari Koto Baru, Solok Regency, is an important center of religious and social activities for the local community. In June 2023, the mosque suffered a major fire that destroyed the entire structure, creating an urgent need to redesign it to be more functional, ergonomic, efficient, and adaptable to local conditions. This community service project aimed to produce an architectural design that not only met structural and functional needs but also accommodated the social aspirations and cultural values of the local community. The methods used in this project included field observations to understand the community's conditions and needs, participatory discussions with local community leaders to explore aspirations and hopes, technical drawings using AutoCAD software, and structural analysis using ETABS to ensure the building's earthquake resistance. Ergonomics were a key consideration in this design, encompassing circulation flow, room dimensions, natural ventilation, and the selection of materials that were friendly and safe for the elderly, children, and people with disabilities. The output of this activity is a variety of design documents, including floor plans, elevations, building sections, floor plans, columns and beams, and 3D visualizations that can be used as a guide for phased construction. This program demonstrates the importance of collaboration between universities and the community in responding to post-disaster infrastructure needs. This knowledge-based, participatory approach is expected to produce a final design that is appropriate to real needs and the local context, and supports better and more sustainable post-disaster recovery.

Taqwa Mosque in Jorong Sawah Mudik, Nagari Batahan Utara, Pasaman Barat Regency, plays a significant role as a center for worship, education, and social activities in the community. However, over time, the mosque's condition has become inadequate to meet the growing needs of its congregation. This study aims to redesign and develop the mosque with an earthquake-resistant structural concept using caisson foundations. The methods employed include data collection, spatial needs analysis, structural design using AutoCAD and ETABS applications, and participatory discussion forums with the local community. The result is an optimal mosque design that considers spatial efficiency, accessibility, and sustainability. This study highlights the importance of community involvement in creating a design that is not only functional but also aligned with local values.