Atmaja, Adyatma Andhika and Dr. Eng. Ir. Ming Narto Wijaya, ST., MT., M.Sc. and Dr. Eng. Ir. Lilya Susanti, ST., MT. (2022) Analisis Pemodelan Perilaku Beban dan Perpindahan pada Portal dengan Bracing Eksentris Tipe Y dan Inverted-Y. Sarjana thesis, Universitas Brawijaya.
Abstract
Indonesia merupakan negara kepulauan yang secara geografis dilintasi oleh sirkum pegunungan pasifik dan sirkum pegunungan mediterania. Hal tersebut menyebabkan Indonesia berada di wilayah cincin api pasifik (the pacific ring of fire) sehingga terdapat banyak gunung berapi aktif. Indonesia juga berada pada pertemuan empat lempeng utama dunia, yaitu lempeng Pasifik, lempeng Eurasia, lempeng Laut Filipina, dan lempeng Indo-Australia. Oleh karena itu, wilayah Indonesia seringkali terjadi bencana gempa bumi yang disebabkan oleh dua faktor tersebut. Bangunan tahan gempa dapat direkayasa dengan penambahan elemen pengaku (bracing) pada gedung tersebut sehingga dapat mereduksi beban lateral yang disebabkan oleh gempa tersebut. Bracing adalah elemen pengaku tambahan yang dipasang pada portal gedung sebagai pengubah gaya lateral yang disebabkan oleh gempa menjadi gaya aksial. Sistem rangka bracing eksentris memiliki elemen tambahan yaitu link beam agar mendisipasi energi beban gempa tersebut. Terdapat beberapa macam rangka bracing eksentris yang salah satunya yaitu bracing eksentris tipe Y dan bracing eksentris tipe inverted-Y. Penelitian ini melakukan analisa beban dan perpindahan dari suatu portal baja yang diberikan bracing eksentris tipe Y dan inverted-Y menggunakan bantuan perangkat lunak ABAQUS Student Edition dengan cara analisa statik non-linier yaitu pushover analysis. Analisis pushover ini dilakukan dengan menerapkan beban pada portal secara bertahap dan bertingkat hingga portal mencapai titik runtuhnya. Jarak eksentritas dari link beam tersebut juga dibedakan sehingga link beam mempunyai jarak eksentrisitas (e) sebesar 60 cm dan 120 cm. Kemudian pada pemodelan setiap portal tersebut pada saat komputasi akan dilakukan 5 (lima) tipe meshing berdasarkan number of elements, yakni menggunakan meshing 4, 8, 16, 25, dan 32 Hasil dari analisis dari sofrware ABAQUS Student Edition menunjukkan bahwa terdapat pengaruh dari perbedaan panjang eksentrisitas pada rangka bresing eksentris.
English Abstract
Indonesia is an archipelagic country which is geographically crossed by the circum of the Pacific Mountains and the circum of the Mediterranean Mountains. These cause Indonesia to be located in the Pacific Ring of Fire, so there are many active volcanoes. Indonesia is also located at the confluence of four of the world's main plates, namely the Pacific plate, the Eurasian plate, the Philippine Sea plate, and the Indo-Australian plate. Therefore, in Indonesia, earthquakes often occur due to these two factors. Earthquake resistant buildings can be designed with the addition of bracing elements to the building that to reduce lateral loads caused by the earthquake. Bracing is an additional stiffening element that is installed on the building portal to convert lateral forces due to earthquakes into axial forces. The eccentrically braced frames system has an additional element, namely a link beam to dissipate the energy of the earthquake load. There are several kinds of eccentric bracing frames, one of them is Y and inverted-Y type eccentric bracing. This study analyzes the load and displacement of a steel portal with Y and inverted-Y eccentric bracing type using ABAQUS Student Edition software by means of non-linear static analysis, namely pushover analysis. This pushover analysis is carried out by applying a load to the portal increasing the load gradually until the portal reaches the point of collapse. The eccentricity distance of the link beam is also divided so that the link beam has an eccentricity distance (e) of 60 cm and 120 cm. Then in the modeling of each portal at the time of computation, 5 (five) types of meshing will be carried out based on the number of elements, using meshing 4, 8, 16, 25, and 32. The results of the analysis of the ABAQUS Student Edition software show that there is an effect of the difference in eccentricity length on the eccentrically braced frame. The longer the link beam, the smaller the load that the structure can withstand, meanwhile the greater the displacement. The inverted-Y type EBF model with an eccentricity of 60 cm has the largest maximum load among other models, which is 382,365.11 N or 39,017 tons. Meanwhile, in the inverted-Y type EBF model, the 120 cm eccentricity has the largest maximum displacement than the other models, which is 0.885 m or 88.5 cm. The load decrease occurs at the eccentricity of 60 cm to 120 cm in each model. The biggest decrease occurred in the EBF type Y model by 16.15%. Inverted-Y type model when compared to the Y type model looks stronger in resisting the load. This is because the applied load is placed on the upper left side of the structure. Therefore, the inverted-Y link beam load works harder than the Y type link beam.
Other obstract
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| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | 0522070125 |
| Uncontrolled Keywords: | Kata Kunci: beban lateral, rangka bresing eksentris, meshing, beban dan perpindahan, software ABAQUS |
| Subjects: | 600 Technology (Applied sciences) > 624 Civil engineering |
| Divisions: | Fakultas Teknik > Teknik Sipil |
| Depositing User: | yulia Chasanah |
| Date Deposited: | 27 Jul 2022 06:57 |
| Last Modified: | 27 Jul 2022 07:01 |
| URI: | http://repository.ub.ac.id/id/eprint/192789 |
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