EARTHQUAKE RESISTANCE OF SIMPLE REINFORCED CONCRETE STRUCTURES DESIGNED BASED ON GRAVITY LOAD

• Main Author: Gunawan, Marvin
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/70117
• Institution: Institut Teknologi Bandung

Indonesia is a country with a high earthquake frequency and volcanic activity. To prevent casualties in case of an earthquake, buildings must be design in such a way so that it may resist (to a certain extend) earthquake load. Simple structures, usually low-rise buildings, often constructed not in accordance to the technical provision in effect. The complexity in which earthquake resistant buildings are designed requires engineers with ample skills and suitable finite-element based supporting softwares. To answer this challenge, a general increase in quality of the construction industry is required, be it by increasing the quality of the engineers involved or by creating guidelines with simplified standards. In this study, a simpler and easier to execute methods of earthquake resistant buildings design will be devised. Popular and easily available calculating softwares, such as spreadsheets based softwares, will be the primary supporting tool for this method. This new design method can be plit into a few core steps. First, a model of a simple low-rise building per definition of ACI 314R will be devised. Next, as an alternative of conventional earthquake resistant building design methods, element internal forces will be calculated as per article 6.5 of SNI2847 to determine member’s load capacity. These structural elements will then be detailed in accordance to SNI2847 as special moment resisting frames. The model will then be checked for earthquake resistance as a whole through a non-linear analysis. A parametric study will be conducted by varying the values of response spectral acceleration parameter, both on short period (SDS) and long period (SD1) to determine where the new method is suitable for use. Each combination of response spectral acceleration parameter will be subjected to the same 11 sets of ground motion. From this non-linear analysis, it is observed that the new method is suitable for use on sites in which the value of SDS does not exceed 0.61. The capacity of the observed structure appears to be limited primarily by beam sheer stresses and least limited by column axial load and story drifts. It also observed that SD1 values affects structure response more than SDS values; this fact correlates greatly with the structure’s natural period.