Claim Missing Document
Check
Articles

Found 4 Documents
Search

Metode Numerik Dan Alat Komputasi Untuk Menilai Keandalan Sistem Infrastruktur Dan Kerentanan Bahaya Gempa Wanto, Sri; Devianty, Sherly; Wulandari, Aprilia; Wantoro, Mamik
Jurnal Rekayasa Infrastruktur Vol. 10 No. 2 (2024): Jurnal Rekayasa Infrastruktur
Publisher : Program Studi Teknik Sipil Universitas Wiralodra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31943/jri.v10i2.272

Abstract

Letak geografis Indonesia berada di wilayah Ring of Fire atau Cincin Api Pasifik, yakni pertemuan tiga lempeng tektonik dunia seperti Lempeng Indo-Australia, Lempeng Eurasia dan Lempeng Pasifik. Oleh sebab itu, Indonesia termasuk negara yang rawan dilanda bencana seperti gempa bumi, letusan gunung berapi hingga tsunami. Dengan adanya kerentanan bahaya alam yang berpotensi diwilayah indonesia maka sangat diperlukan sebuah mitigasi atau penilaian keandalan sistem infrastruktur dan kerentanan bahaya gempa dalam setiap bangunan fasilitas umum yang ada. Dalam penilaian keandalan dan kerentanan bisa digunakan dengan methode numerik dan alat komputasi yaitu dalam artikel ini menyampaikan salah satu software yang bisa digunakan dalam membantu membuat pemodelan sebuah konstruksi dan bisa memprediksi kerentanan bahaya dari setiap tahap gempa yang diterima oleh bangunan tersebut. Dalam pemodelan ini juga bisa memprediksi seberapa besar beban gempa yang bisa diterima oleh bangunan ini sampai mengalami runtuh. Dalam penelitian ini analisa yang menggunakan metode Analisis Pushover dengan software seismostruct yang dimana nanti akan menghasilkan sebuah kurva kapasitas. Hasil dari kurva kapasitas maka bisa digunakan sebagai parameter untuk membuat kurva kerapuhan yaitu hubungan antara probabilitas dengan perpindahan dari respon spektral. Dari hasil kurva kerapuhan dapat diprediksi pada kondisi bagaimana bangunan tersebut mengalami kerusakan ringan, sedang, berat dan runtuh dengan asumsi beban gempa yang semakin meningkat.
Mengevaluasi Struktur Beton Pada Bangunan Eksisting Dengan Penambahan Sistem Base Isolation Berdasarkan Seismic Fragility Wanto, Sri -
JTERA (Jurnal Teknologi Rekayasa) Vol 9, No 2: December 2024
Publisher : Politeknik Sukabumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31544/jtera.v9.i2.2024.33-44

Abstract

Abstrak Secara prinsip perkuatan struktur adalah proses teknis yang dirancang untuk meningkatkan kapasitas, kekuatan, atau stabilitas suatu struktur yang mungkin telah mengalami penurunan performa akibat peningkatan beban seperti beban gempa yang dimana menjadi konsentrasi mitigasi pada bangunan saat ini. Pada penelitian ini akan menambahkan perkuatan struktur pada bangunan eksisting dengan menambahkan yaitu base isolation pada setiap kolom. Sistem penambahan base isolation adalah metode yang digunakan dalam rekayasa struktur untuk melindungi bangunan dari kerusakan yang disebabkan oleh gempa bumi. Tujuannya adalah mengurangi transfer energi seismik dari tanah ke struktur bangunan, sehingga mengurangi dampak gempa pada bangunan tersebut. Sistem base isolation berfungsi dengan cara memisahkan bangunan dari getaran tanah yang disebabkan oleh gempa. Ini dicapai dengan memasang perangkat isolasi di antara fondasi dan struktur atas bangunan. Perangkat isolasi biasanya berupa bantalan atau lapisan elastomerik (seperti karet) atau perangkat yang menggunakan pegas dan damper. Perangkat ini dirancang untuk menyerap dan meredam energi seismik. Dengan mengurangi transfer energi dari tanah ke struktur bangunan, base isolation membantu mengurangi gaya yang bekerja pada struktur dan meningkatkan daya tahan bangunan terhadap kerusakan. Analisis akan dilakukan dengan memodelkan bangunan struktur tersebut dengan perangkat software seismostruct. Untuk metode yang digunakan yaitu menggunakan Dynamic Time History yang dimana hasil dari pemodelan tersebut akan menghasilkan sebuah kurva hubungan antara simpangan antar segmen/ Interstory Drift Ratio (ISDR). Selain itu diperoleh kurva histerisis dan spektrum kapasitas yang bisa digunakan sebagai hasil data yang dimana akan menghasilkan sebuah kurva kerapuhan yang digunakan sebagai evaluasi pengaruh dari penambahan perkuatan struktur tersebut. Kata kunci: Base Isolation, Dynamic Time History, Interstory Drift Ratio, Kurva Kerapuhan Abstract In principle, structural reinforcement is a technical process designed to increase the capacity, strength, or stability of a structure that may have decreased in performance due to increased loads such as earthquake loads, which are the concentration of mitigation in buildings today. This research will add structural reinforcement to the existing building by adding base isolation to each column. The base isolation system is a method used in structural engineering to protect buildings from damage caused by earthquakes. The goal is to reduce the transfer of seismic energy from the ground to the building structure, thereby reducing the impact of the earthquake on the building. Base isolation systems function by separating the building from the ground vibrations caused by the earthquake. This is achieved by installing isolation devices between the foundation and the upper structure of the building. Isolation devices are usually pads or elastomeric layers (such as rubber) or devices that use springs and dampers. These devices are designed to absorb and dampen seismic energy. By reducing the transfer of energy from the ground to the building structure, base isolation helps reduce the forces acting on the structure and increases the building's resistance to damage. The analysis will be carried out by modeling the building structure with seismostruct software. For the method used is using Dynamic Time History where the results of the modeling will produce a relationship curve between the intersegment deviation / Interstory Drift Ratio (ISDR). In addition, hysteresis curves and capacity spectra are obtained which can be used as data results which will produce a fragility curve which is used to evaluate the effect of adding reinforcement to the structure.     Keywords: Base Isolation, Dynamic Time History, Interstory Drift Ratio, Fragility Curve  
Perbandingan Retrofit Seismik Struktur Baja Eksisting dengan X-Bracing Dan Inverted V-Bracing Kamal, Muhammad Iqbal Habibi; Wanto, Sri; Hidayah, Nurul Firkhati
SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan) Vol 6 (2024)
Publisher : SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Indonesia is a country that is at the meeting point of three of the Earth's main plates, namely the Indo-Australian Plate, the Eurasian Plate and the Pacific Plate, which are currently actively moving. The plate that really influences the situation around the Java region is the pushing of the Indo-Australian plate towards the Eurasian plate. This situation causes the formation of many volcanoes in Sumatra, Java, Bali and Papua, and active movements between plates often cause earthquakes in these regions. Indonesia's geographic location has a high risk of earthquake impacts, but the rapid development and growth of infrastructure can affect the service life of a building structure. Earthquakes are unpredictable dynamic loads, especially for buildings designed according to old design codes and standards, which are vulnerable to earthquake loads. To achieve satisfactory global seismic behavior, it is necessary to evaluate the existing structure and add appropriate reinforcement. This paper analyzes the strengthening of steel structures using X-Bracing and Inverted V- Bracing BRB with the Pushover Analysis Method. The results of this research are presented in the form of a fragility curve which describes the probability of damage before and after strengthening the X-Bracing and Inverted V- Bracing BRB. By knowing the overall structure in the form of a capacity curve, it is possible to rationally evaluate retrofitting strategies.
Evaluation of the Sragi Secondary Channel of the Kaliwadas Irrigation Area, Pekalongan Regency Wanto, Sri; Masvika, Hendra; Cahyono, Dhamang Budi; Purwanti, Hani
JACEE (Journal of Advanced Civil and Environmental Engineering) Vol 7, No 1 (2024): April
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/jacee.7.1.8-17

Abstract

The Sragi secondary channel is located in the Kaliwadas irrigation area, Pekalongan Regency has a length of 7,587 m. The position of the channel is in a rice field area which is used to optimize irrigation to support agricultural business productivity. The existing condition of the channel in the form of native soil causes frequent leaks. Technical handling is needed to repair irrigation buildings in the form of a study on the existing condition of the Sragi secondary channel through field surveys and checking physical conditions. Furthermore, identification of the level of damage to irrigation channels is carried out. From the problems that arise at the identification stage, recommendations are then given in the form of proposals for improvements to buildings and irrigation channels. The results of the field survey in the form of network tracing provide data that the level of physical and functional damage to the Sragi secondary channel infrastructure reaches >40%. The condition is categorized as very bad with the classification of severely damaged which requires repair or replacement. Most of the damage in the form of spots or localized occurred on the existing lining of masonry and precast concrete starting from Hm 50+00 to Hm75+68. The recommendations for improvement are in the form of dismantling the existing precast concrete lining according to the point of damage. It is recommended to repair the lining using K-300 precast concrete so that the structure of the irrigation channel is safe against the risk of deformation.