UNIVERSITAS ATMA JAYA YOGYAKARTA LIBRARY’S STRUCTURAL RESPONSE TO EXTERNAL BLAST LOADING

PONGSITANAN, EDGART PRAHARJA MASGAWAN (2016) UNIVERSITAS ATMA JAYA YOGYAKARTA LIBRARY’S STRUCTURAL RESPONSE TO EXTERNAL BLAST LOADING. S1 thesis, UAJY.

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Abstract

Over 10 years the terrorist activities and threats have become the growing problem in Indonesia. Following the September 9th, 2004, vehicle bombing of the Australian Embassy in Kuningan, Jakarta, July 17th, 2009, bombing at the JW Marriott hotel and Ritz-Carlton hotel, Jakarta, until the most recent terrorist activities January 14th, 2016, explosions and gun fire near Plaza Sarinah, Jl. MH Thamrin, Jakarta Pusat. As we already aware that terrorists were targeting the government buildings, embassies, hotels, but after a decade and a half of rolling waves of terrorist act across the world, these buildings are now harder to hit, so they’ve changed their target, over the last 13 months there has been a series of extremely bloody attacks on school, colleges and universities. This final project attempts to analyze the UAJY’s library structure subjected to the blast loading especially from vehicle bombing. The blast loading obtains by using software called AT Blast and compared with the procedure proposed by UFC 3- 340-02. The blast load was analytically determined as a pressure-time history and numerical model of the structure was created using ETABS 2015 (v.15.2.0), the conventional software for the static/dynamic analysis of structures, as a full 3D model with Beam elements for girders and columns and Shell elements for slabs. The blast pressure is depending on the stand-off distance. Peak refracted overpressure Pr was increasing when the stand-off distance decreasing. Resulted in the reflected overpressure is more at the bottom floors and low at the top floors. Blast has a characteristic of high amplitude, the explosion near the structure can cause catastrophic damage to the structure, from the story drift ratio result it was observed that the story drift exceeds the story drift limitation as per SNI 1726: 2012 Section 7.12.1 the story drift ratio shall not exceed 0.015. From the graphical representation of joint displacement and maximum story displacement the maximum response on the concrete frame structure under the action of blast loading is occur at the top. From the maximum story drift ratio figure, the maximum ratio was occurred at the first level of the building in the y direction is about 0.055. Therefore, the Universitas Atma Jaya Yogyakarta’s Library current design cannot resist blast loading come from vehicle with 227 kg charge weight.

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