Evaluasi dan Retrofit Struktur Gedung Beton Bertulang Akibat Kebakaran

ABSTRACT Several studies have been carried out related to the impact of fire on the strength of reinforced concrete material. It shows that there is a decrease in strength and a decrease in structural stiffness. The degree of damage is dependent on the temperature and duration of the fire. To ensure accessibility, the building needs to be evaluated whether the building can be re-functioned immediately. The results of site investigation are evaluated to determine the structure retrofit and reinforcement methods and cost-effectiveness compared to the cost of a new building. The office building structure under review is analytically evaluated based on SNI 1726:2019 and SNI 1727:2018. The results showed that 31% of columns and 32% of beams need to be strengthened. In addition, steel bracing and CFRP wrapping on the structural elements were applied. The cost of retrofitting required Rp2.998.488.781,07, which is lower than the cost of the new building structure, which costs Rp4.950.087.016,34. ABSTRAKBeberapa penelitian yang telah dilakukan terkait dampak kebakaran terhadap kekuatan material beton bertulang, memperlihatkan bahwa terdapat penurunan kekuatan dan kapasitas struktur. Tingkat penurunan tergantung antara lain pada suhu dan durasi kebakaran. Untuk meyakinkan tingkat fisibilitas, gedung tersebut perlu dievaluasi kemungkinan dapat atau tidaknya gedung itu difungsikan kembali. Hasil evaluasi tersebut dijadikan pertimbangan dalam menentukan metode perbaikan dan perkuatan yang efektif untuk kemudian dibandingkan dengan biaya pembangunan gedung baru. Struktur gedung kantor PLN Unit Cabang Distribusi Jakarta Raya ini akan dievaluasi dengan cara analitis berdasarkan SNI 1726:2019 dan SNI 1727:2018. Terdapat total 31% kolom dan 32% balok yang perlu diperkuat. Metode perkuatan yang digunakan adalah penambahan bracing baja dan CFRP. Material CFRP tersebut dililitkan pada elemen struktur. Biaya perkuatan yang diperlukan adalah Rp2.998.488.781,07, lebih rendah dibandingkan nilai struktur gedung, yaitu Rp4.950.087.016,34.

Seismic Retrofitting of Structures Using Steel Bracing: An Overview

One of the major causes of the collapse of buildings are earthquakes. Reinforced concrete structures are vulnerable to seismic activities and can destruct the structures. The RC structures which are prone to seismic activities should be protected and need to be retrofitted to resist the seismic loads. Retrofitting is one of the best methods which can be used to strengthen the structures safe against seismic loads. Retrofitting techniques will increase the strength, stiffness, ductility and stability of structures as well as reduce the operation costs and environmental impacts. Various techniques of retrofitting can be adapted to improve the stability of the structure. One of the most effective method for retrofitting of structures is the use of steel bracings. Steel bracing can be effectively used for enhancing the earthquake resistance of seismically inadequate reinforced concrete frames. This paper reviews the effect of different steel bracing patterns used as retrofitting technique in the seismic performance of the structures.