Krisnamurti
(Staf Pengajar Jurusan Teknik Sipil, Fakultas Teknik, Universitas Jember)
ABSTRACT: Indonesia is a country with high seismic activity, so that the infrastructure built to meet requirements for earthquake resistance. When an earthquake struck the structure must show a good performance. Structural design must meet the strong column weak beam concept, so that post-earthquake structural failure mechanism that occurred was the side sway mechanism. This study aims to determine the effect of reinforcement on beam area and the lateral column on the failure mechanism of reinforced concrete frame subjected to earthquake loading. The experiment was conducted on the structure of the building 4th floor with 16m high, and 4 span a width of 4m and 5m spacing portal. Beam dimensions 25cmx40cm, 50cmx50cm column, and plate thickness 12 cm. Building for offices in the seismic zone 3 with a moment resisting frame systems (MRFS) and hard soil conditions. Earthquake load is analyzed by the response spectrum analysis method. The structure analysis carried out with the structural analysis program of SAP 2000. Reinforcement beams and columns initially designed with the capacity design method. Failure mechanism of the building structure further examined by adding the intensity of earthquake load gradually. The results showed that the mechanism of side-sway collapse mechanism would be achieved if the initial design reinforcement area on first floor plus a beam of 44.01%, on the second floor beams for 14.80% and spacious fourth floor in the beam reinforcement reduced by 66.82%. Ideal mechanism to achieve after the collapse earthquake load is enlarged until it reaches 60%, with the realization of beam starting from fourth floor to floor in a sequence and finally a failure occurred on the ground floor columns.
Keywords: Strong column weak beam, extensive reinforcement, failure mechanism
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