PENGARUH PERILAKU PEMENDEKAN KOLOM TERHADAP DESAIN TULANGAN BALOK PADA PERANCANGAN GEDUNG TINGGI

• Main Author: Murtiningsih, Diah
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61600
• Institution: Institut Teknologi Bandung

Due to the gravity load, the vertical elements will go through a short-term and long-term axial deformation. In the reinforced concrete structure, creep and shrinkage effects can contribute significantly to column shortening. The effect of column shortening on tall buildings is quite significant because of its accumulated effects, so it needs to be considered in the design. Another problem will arise if there is a different shortening on adjacent columns that can affect the building both structurally and non-structurally. Structurally, the different column shortening can create additional stresses on the horizontal elements and increase the axial force in certain vertical elements. Non-structurally, different column shortening can cause cracks in walls, floors, and damage to mechanical, electrical, and pumbling systems. When modelling the structure is performed, buildings are often modelled in a conventional way where all loads are assumed to act simultaneously when the construction is completed. This assumption is not appropriate, because in the actual condition, the construction of building is performed step by step, so the self-weight has started to work during the construction process. So that, the conventional modelling is not in accordance with actual conditions and it is necessary to do the construction staging modelling. The difference on this modelling method will affect the behavior of the building structure, including the column shortening. In this study, the effect of construction staging modelling will be reviewed consideres the time dependent effect on the column shortening and beam reinforcement design. Modelling and structural analysis will be carried out on three different building (10, 20, and 30 story) using the Midas Gen to determine the effect of column shortening behavior on tall buildings. The results of the study show that the construction stage analysis with consideration of the time dependent effect gives a greater column shortening on the lower floors. The creep and shrinkage effect gets bigger after 30 years, so the column shortening becomes much bigger. It was also found that the column shortening began to be seen significantly in a 20 story building and the effect was even greater for higher building.