Judul: Analisis Seismik Struktur Gedung Zeta Sekolah Vokasi IPB University Dengan Analisis Pushover
Abstrak: Gempa bumi merupakan fenomena alam yang sering terjadi di Indonesia, khususnya di zona subduksi tepatnya di selatan Pulau Jawa, akibat aktivitas lempeng Indo-Australia terhadap paparan Blok Sunda. Penelitian ini diharapkan memberikan rekomendasi untuk mencegah kegagalan struktur, khususnya daerah rawan gempa seperti Bogor dengan mengusulkan pendekatan dengan menggunakan analisis pushover untuk menentukan kapasitas struktur. Hasil pembahasan menunjukkan bahwa struktur Gedung Zeta masih mampu menahan gaya gempa hingga perpindahan 400 mm. Simpangan antar lantai sudah memenuhi batas izin sebesar 46,15 mm. Pembentukan sendi plastis sesuai dengan konsep strong columnweak beam dimana pertama kali terbentuk pada balok dan terakhir pada kolom. Tingkat kinerja struktur untuk arah sumbu-X dan arah sumbu-Y dikategorikan displacement untuk arah sumbu-X dan arah sumbu-Y dikategorikan Immediate Occupancy. Kondisi IO menunjukkan struktur tidak akan mengalami kerusakan struktural dan nonstruktural. Nilai faktor aktual daktilitas menunjukkan bahwa struktur gedung bersifat daktail parsial.
Keyword: earthquake, earthquake force; pushover, plastic joint, structure capacity

Judul: Evaluasi Kinerja Struktur Gedung Bertingkat di Jakarta Menggunakan Pushover Analysis
Abstrak: Gempa bumi menjadi bencana yang sering terjadi di Indonesia. Gempa bumi menyebabkan bangunan bergeser dan jika nilai geser ultimate melebihi nilai beban geser nominal akan membuat struktur mengalami keruntuhan. Evaluasi struktur diperlukan untuk mengetahui tingkat kinerja struktur gedung eksisting terhadap gempa. ASCE 41-17 mengatur cara evaluasi seismik dan retrofit bangunan eksisting pragempa menggunakan prosedur non static liniear. Hasil evaluasi menunjukkan bahwa gedung bertingkat masih mampu menahan gaya gempa BSE 1E dan BSE-2E serta masih memiliki kekuatan untuk menahan gaya gempa sampai perpindahan target awal. Hasil simpangan yang dihasilkan memiliki nilai dibawah batas izin untuk arah X dan Y pada level gempa BSE-1E sebesar 202,504 mm, 196,176 mm dan BSE-2E sebesar 274,352 mm, 266,56 mm. Sendi plastis terbentuk pertama kali pada elemen balok selanjutnya pada kolom. Tingkat kinerja struktur gedung untuk gempa BSE-1E berada pada level immediate occupancy dan gempa BSE-2E berada pada level damage control. Rasio daktilitas struktur memiliki nilai daktilitas parsial dengan nilai demand capacity ratio yang memenuhi sehingga tidak diperlukan retrofit., Earthquakes are a frequent disaster in Indonesia. Earthquakes cause buildings to shift and if the ultimate shear value exceeds the nominal shear load value, the structure will collapse. Structural evaluation is required to determine the level of performance of existing building structures against earthquakes. ASCE 41-17 regulates the seismic evaluation and retrofitting of pre-earthquake existing buildings using the non static linear procedure. The evaluation results show that the building is still able to withstand BSE-1E and BSE-2E earthquake forces and still has the strength to withstand earthquake forces up to the initial target displacement. The resulting deformations have values below the permissible limits for the X and Y directions at the BSE-1E earthquake levels of 202.504 mm, 196.176 mm and BSE-2E of 274.352 mm, 266.56 mm. Plastic joints formed in the beam elements first and then in the columns. The performance level of the building structure for the BSE-1E earthquake is at the immediate occupancy level and the BSE-2E earthquake is at the damage control level. The ductility ratio of the structure has a partial ductility value with a demand capacity ratio value that meets the requirement so that no retrofit is required.
Keyword: ASCE 41-17, Pushover Analysis, Earthquake, Structural Performance, Analisis Pushover, Gempa Bumi, Kinerja Struktur

Judul: Characteristic of chili drying (Capsicum annum L.) as a natural dyeing cosmetic
Abstrak: Chilli (Capsicum sp.) contains carotenoids, which are a group of natural pigments consist of red, orange or yellow color. Carotenoids can be dissolved in lipid so that they can be applied to oil-based cosmetic ingredients. Therefore, chilli is potential to be developed as cosmetic colorants. However, pungency of red chili needs to be removed because it is irritating and it provides stinging sensation to skin. Red chilli was investigated as a potent material for a cosmetic colourant in this research because it has a nice uniform red color and has a pungency level less than cayenne pepper. The purpose of this research was to investigate the influence of blanching on drying characteristics of red chilli using a tray dryer, determine the proper time of chili blanching in sodium bisulfite solution, examine color changes stability of red chili powder as a cosmetic dye, and analyze the effect of oleoresin extraction on color and pungency level of red chili powder. The results showed that blanching could affect the drying characteristics. Blanching the chilli for 9 minutes prior drying could speed up the drying rate of chilli and thus the drying time, therefore, the chilli achieved the desired moisture content fast. Sodium bisulfite solution of 0.2%, used as the blanching media, could maintain the color well. However, longer time of blanching might cause several pigments soluble in the blanching media. Blanching the chilli for 9 minutes was able to maintain red color after the stability tested and after extraction of oleoresin. Therefore, blanching red chilli in a solution of 0.2% sodium bisulfite for 9 minutes prior drying is concluded as the best treatment to retain the color of red chilli powder
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