ENGINEERING JOURNAL : PENGARUH EKSENTRISITAS KONFIGURASI SISTEM SRPM GEDUNG BERTINGKAT BANYAK TERHADAP PERILAKU PORTAL BETON BERTULANG

Jurnal Rekayasa Vol 3 No 1 Artikel 03

Krisnamurti
(Staf Pengajar Jurusan Sipil, Program Studi Teknik, Universitas Jember)

Agoes Soehardjono MD dan Wisnumurti
(Staf Pengajar Jurusan Sipil, Fakultas Teknik, Universitas Brawijaya)


ABSTRACT

The tectonic earthquake activity in Indonesia is increased. It is happened at Nangroe Aceh Darussalam in 2004 and Yogyakarta in 2006 It must be anticipated by some efforts to prevent the structural failure which induced by earthquake forces. Meanwhile, the modern architectural often evoke the unsimetrical configuration of the structural geometric. It will cause the center of mass and the center of rigidity in the building cannot geometrically coincide for all possible earthquake directions. The result is rotation, which will tend to distort the building in ways that will vary in nature and magnitude depending on the nature and direction of the ground motion, and result in forces that are very difficult to predict and analyze. This research aim to get the relationship between excentricity of the center of mass and the center of rigidity which induced by plan structural irregularities configuration with the performance parameter of the reinforced concrete multistory building. This research use 10 (ten) eight-story reinforced cocrete office building models which different in plan configuration each other. The gravity load analysis and the static equivalent analysis is used to design the first model structure. Then, all of models will analysis by time-history analysis to get the value of the performance parameter. Result in this research shows that configuration factor will influence structural stiffness and structural respons which induced by earthquake excitation. In Indonesia the 2nd and the 4th structural models which have torsional irregularity and re-entant corner were grouped as an irregular structural model, meanwhile the 1st model which have two simetrical axis and the 3rd which have one simetrical axis were grouped as regural structural model.

Keywords: static equivalent analysis, time-history analysis, torsional stiffness, center of mass, center of rigidity

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