EVALUATION OF THE SAFETY AND STRUCTURAL APPROPRIATENESS OF AN ASYMMETRIC HIGH-RISE BUILDING WITH A CORNER ARCH STYLE
Ayuddin
Abstract
This research aims to analyze the structure of office buildings in Donggala Regency, Central Sulawesi, using ETABS software. The analysis is conducted to evaluate the safety and conformity of the structural design with the applicable planning standards. Using ETABS V.18, the calculation of internal forces on structural elements includes axial forces, shear forces, moments, and torsions. The analysis results indicate that all structural elements meet the design requirements and are considered safe, meaning no further evaluation of the building structure is necessary. The obtained values are as follows: axial force -7934.6291 kN, shear force 81.2893 kN, moment 92.7019 kN·m, and torque 8.0531 kN·m. Therefore, the structural design is reliable in withstanding the applied loads, in accordance with the applicable standards.
Keywords :
Structure Evaluation; Asymmetric Building; Structure Safety
Calculated Building Description :
This building is a multi-storey office structure that uses a reinforced concrete system with a grid arrangement of columns and beams. The building has an L-shape, with a corner section featuring a triangular plate configuration. It is designed to withstand both vertical and lateral loads.
3-Dimensional Building Portal Model :
Support Reactions :
A pedestal reaction is the force or moment acting on the pedestal of a structure to maintain equilibrium due to the loads applied to the structure. These reactions arise in response to external forces exerted on the structure and depend on the type of support, the applied loads, and the configuration of the structure. The pedestal reaction acts along three axes: the X, Y, and Z axes.
Forces In a Structure :
In a building structure, internal forces play an important role. Moments occur when a force acts at a certain distance from the point that resists the moment, and the magnitude of the moment is the force’s magnitude multiplied by the distance. The internal force diagram is a graphical representation that shows the magnitude of forces, including shear force, moment, axial force, and torque, acting on the structure.
1) Axial Force
Axial force is the force that acts parallel to the axis of a member. Axial load is the force acting vertically. A large axial force occurs at the pedestal, with a magnitude of -7934.6291 kN.
2) Shear Force
An internal shear force is a force that occurs within a structural element due to an external force acting parallel to the cross-sectional surface of the element. This force acts in a horizontal direction or parallel to the plane of the cross-section and tends to cause the structural elements to slide relative to each other. Shear force 2.2 is the force that acts along the local axis 2 (weak axis) of the frame. The magnitude of the shear force is 81.2893 kN.
3) Moment
Moment is a quantity that measures the tendency of a force to cause rotation or twisting in an object or structure around a specific point or axis. Bending moment 3.3 is the moment that acts along the local axis 3 (strong axis) of the frame. It can be seen that the magnitude of the bending moment is 92.7019 kN·m.
4) Shell Moment
Shell moment is the internal force that occurs in the plate and wall (shell) structural elements due to a combination of external loads. Bending moment M11 is the moment that acts along the local axis 1 of the frame. It can be seen that the bending moments are represented by different colors, starting from purple, which represents the largest negative moment, to dark blue, which represents the largest positive moment.
5) Torque
Torque is a quantity that describes the tendency of a force to cause rotation or twisting of an object around a specific axis. The largest acting torque is 8.0531 kN.
The results of this calculation demonstrate the application of structural analysis for multi-storey buildings using ETABS software. The version of ETABS used is ETABS V.18. The structural analysis results show that the building is safe against strong earthquakes and meets the requirements of the Indonesian National Standard (SNI). This building is an office building located in Donggala District, Central Sulawesi, Indonesia. Structure Consultant Ayuddin (SCA) is a structural analysis consultant with expertise in analyzing various types and variations of buildings. Additionally, the building’s design has been optimized to minimize construction costs while ensuring the structural strength and stability against strong earthquakes.