ANALISIS KURVA FRAGILITAS PADA STRUKTUR BANGUNAN 12 LANTAI DENGAN METODE PUSHOVER

Kurva fragilitas sering disebut juga kurva kerapuhan yang digunakan untuk menggambarkan probabilitas kerusakan atau probabilitas terjadinya suatu tingkat kerusakan pada suatu bangunan dengan besarnya beban lateral. Karena di kota Padang merupakan salah satu kota di Sumatera Barat yang memiliki banyak bangunan tinggi dan juga pernah terjadi gempa ditahun 2009 dengan 7,6 SR yang dampaknya sangat besar pada kerusakan bangunan yang rentan dan hilangnya nyawa. Oleh sebab itu evaluasi kerentanan bangunan seismik sebelum terjadinya gempa bumi adalah langkah penting dalam mencegah kerusakan pada bangunan dan korban jiwa. Pada studi ini yakni dilakukan analisis kurva fragilitas pada struktur bangunan 12 lantai dengan metode pushover. Analysis pushover dilakukan untuk mengetahui level kinerja struktur dan dikembangkan dengan menggunakan kurva fragilitas. Secara umum pada tesis ini, metode yang dilakukan yakni pertama dilakukan permodelan menggunakan software analisis struktur yaitu Structural Analysis Program (SAP2000) Versi 23. Dari hasil analisa Struktur, bangunan 12 lantai akan mengalami titik leleh pertama ketika diberi beban pushover ke-3 baik pada arah-X maupun arah-Y dan struktur bangunan akan collapse ketika diberi beban pushover ke-10 pada arah-X dan ke-8 pada arah-Y. Untuk level kinerja struktur bangunan 12 lantai termasuk dalam level kategori Damage Control (DO) untuk arah X-X yang berarti transisi antara Immediate Ocupancy (IO) dan Life Safety (LS). Sedangkan untuk arah Y-Y, struktur termasuk dalam level kategori Immediate Ocupancy (IO). Kemudian, untuk membangun kurva fragilitas atau analisis kurva fragilitas, dilakukan terlebih dahulu analisis tingkat resiko melalui analisis pushover non-linier. Sehingga kurva fragilitas didapat dari metode displacement coeficient method (FEMA-356) hasil pushover analysis. Dari metode tersebut sehingga bisa mendapatkan perilaku non-linear performa strukur bangunan setelah menerima beban gempa sehingga dapat mengestimasi tingkat kerusakan struktur bangunan akibat gempa berdasarkan HAZUS (Hazard United States) yang selanjutnya menjadi pedoman untuk membuat kurva fragilitas. Dari hasil analisis didapat kurva fragilitas baik arah-X maupun arah-Y struktur bangunan 12 lantai yang akan mengalami probabilitas kerusakan masing-masing baik slight, moderate, extensive, dan complete damage. Dengan demikian, maka dalam hal ini bangunan masih mampu menahan beban gempa yang terjadi, bangunan juga dapat dipakai kembali ketika telah menerima beban gempa dan untuk resiko korban jiwa manusia relatif kecil. Kata kunci: Kurva Fragilitas, Pushover Analysis, HAZUS, FEMA-356/440, Response Spectrum SNI 1726 : 2019, Applied Technology Council (ATC-40), Performance Level

Equipment tracking and security system for hospital environment using WLAN indoor location tracking system

Location tracking systems has brought tremendous benefits, especially to the medical field; one of its benefits is to help keeping track of critical equipment of the hospital which is a challenge in any hospitals. However hospital's equipment often scattered throughout the facility, forcing busy staff to waste precious time tracking down intravenous pumps, wheelchairs or other equipment. Furthermore, hospital also suffers the lost of the equipment due to thefts. Therefore, equipment management system using Wireless Location Area (WLAN) based indoor location tracking system is proposed to alleviate these problems. A simple measurement campaign will be conducted to study the properties of the Ekahau location tracking system and then the equipment management system which include real-time equipment tracking and security system. Ekahau WLAN-based indoor location tracking system will be applied in this project to provide real-time location estimation. Each equipment will equipped with Ekahau WLAN Tag, and its location will be calculated by the Ekahau engine server. The location is predicated through WLAN signal strength finger-printing technique. Requirements of basic equipment tracking and security will be developed and examined in Java platform. A test-bed would then be setup within the confines of the WCC (wireless Communication Centre) using the existing WLAN incorporating the IEEE 802.11g standard AP (Access Point) and adapters. The location of the equipment will be provided by Ekahau positioning engine software readily available at the WCC. At the end of the project, a system which is capable to provide real-time equipment's location to user will be developed. Besides that the system will be capable to give alert to the control centre if the hospital's equipment is brought out from the authorized area

Phytochemical evaluation, antimicrobial and anticancer properties of new “oligo grapes” supplement

© The Author(s) 2019 This research presents complete data about phytochemical analysis and biological activities of a new dietary supplement for commercial use “Oligo Grapes” (OG), and its individual constituents: lyophilized pomace (LP), clay supplemented with red wine extract, lyophilized pomace ethanolic extract (PE), and red wine extract. OG, as a commercially available food supplement, has not been previously tested for its biological activity. Now we want to present new data about its phytochemical screening, antioxidant and antibacterial activities, and anticancer properties with respect to its cytotoxicity and effects on redox status in colon cancer cell lines. The tested extracts expressed strong antibacterial activity against Proteus mirabilis and Proteus mirabilis ATCC 12453, where the synergy of contents inside the supplement demonstrated a higher influence on the bacteria than its separately tested constituents. Among the investigated extracts, PE, as the extract with the highest phenolics concentration, had remarkable cytotoxic activity on HCT-116 and SW-480 colon cancer cells. Also, the treatments modulated redox status in the investigated cancer cells, by inducing oxidative and nitrosative stress, which could be one of the preferred mechanisms of the anticancer action. Based on the achieved antimicrobial and anticancer properties, there is a need for producing different food supplements and nutritional products originating from grapes. In this respect, the food supplement OG and its health benefits deserve scientific attention and further research