THE PROGRESSIVE COLLAPSE PERFORMANCE STUDY OF DUAL REINFORCED CONCRETE SYSTEM WITH BUILDING HEIGHT VARIABLE AS TSUNAMI VERTICAL EVACUATION BUILDING

• Main Author: Mawar Oktavina, Sekar
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/36530
• Institution: Institut Teknologi Bandung

Indonesia is a country that quite vulnerable to the tsunami. Normally, tsunami is triggered by an earthquake that can be derived from volcanic or tectonic earthquake. Tsunami waves can reach the ground with speed and tremendous power. Sometimes, people do not have time to look around the coastal refuge because of this. Solutions that can be offered is to build a temporary vertical evacuation buildings to withstand tsunamis. The building is built in a strategic location as an emergency refuge when horizontal evacuation is not possible. Tsunami is able to wash away various objects and bring it to the mainland with the current wave. Drifting objects is very likely hit the building and causing the column elements to fail. This column failure can lead to a progressive collapse so that the total collapse of the building occurs. Vertical evacuation buildings being built must be able to survive against this phenomenon. The method used to determine the vulnerability of buildings to the possibility of progressive collapse is a linear static analysis method by using exterior consideration. First of all, the building should be designed to withstand the earthquake and tsunami loads. After that, some perimeter column failure simulations is conducted on one side of the building. The strength of each structural element that is connected to the failed column must be checked against gravity loads. This checking is done by comparison of demand and capacity (demand-capacity ratio, DCR) using load combination of 2(DL + 0.25 LL). Building is declared safe against the possibility of progressive collapse if all the elements that have to be reviewed have DCR value ? 2.0. This final assignment used two building models with different configurations of the building height. Both are designed to withstand the same earthquake and tsunami loads. These building models are simulated to progressive collapse with method as mentioned before. The simulations is carried out with five different scenarios. The results of the simulations show that both models of buildings vulnerable to progressive collapse with the failure of a single exterior column. However, the best configuration of these two buildings is model building II which has a greater height. v It is shown from the DCR value of model II which is always smaller than model I in all column failure scenarios conducted. In this final assignment, the effort to prevent the progressive collapse possibility is also conducted. Prevention of progressive collapse of the building on both models is conducted by increasing the capacity of the elements around the failed column. The increase in capacity will reduce the value of DCR. Once the building is secure against progressive collapse, the planning of tsunami vertical evacuation building is complete. The algorithm of tsunami vertical evacuation building planning is also proposed by the steps undertaken in this assignment.