EVALUATION OF SAFETY AND STRUCTURAL APPROPRIATENESS OF ASYMMETRIC HIGH RISE BUILDING WITH 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 carried out to evaluate the safety and conformity of the structural design to the applicable planning standards. By using ETABS V.18, the calculation of internal forces on structural elements includes axial forces, shear forces, moments, and torsions. The analysis results show that all structural elements meet the design requirements and are declared safe, so no further evaluation of the building structure is required. The axial force value obtained was -7934.6291 kN, shear force 81.2893 kN, moment 92.7019 kN.m², and torque 8.0531 kN. Thus, the structural design that has been designed is reliable in withstanding the loads that work in accordance with applicable standards.

Keywords :

Structure Evaluation; Asymmetric Building; Structure Safety

Calculated Building Description :

This building is a multi-storey building structure for office functions using a reinforced concrete structural system with a grid system of columns and beams. The building is L-shaped and there is a corner section with a triangular plate configuration. The building is designed to withstand vertical loads and lateral loads.

3-Dimensional Building Portal Model :

Support Reaction :

A pedestal reaction is the force or moment that acts on the pedestal of a structure to maintain equilibrium due to the loads acting on the structure. These reactions occur in response to external forces received by the structure and depend on the type of support, the loads acting, and the configuration of the structure. The acting pedestal reaction consists of 3 axes, namely the X, Y, Z axes.

Force In Structure :

In a building structure, internal forces have an important role. Moments occur when a force acts a certain distance from the point that will hold the moment and the magnitude of the moment is the magnitude of the force multiplied by the distance. The internal force diagram is a diagram that shows the amount of force, be it shear force, moment force, axial force and torque acting on the structure.

1) Axial Force

Axial force is the force parallel to the member axis. Axial load is the force in the vertical. The large axial force occurs at the pedestal with a force magnitude of -7934.6291 kN.

2) Shear Force

An internal shear force is an internal force that occurs in 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 attempts to cause the structural elements to slide one against the other. Shear force 2.2 is the force that occurs in the direction of the local axis 2 (weak axis) of the frame. The large 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.The bending moment 3.3 is the force that occurs in the direction of the local axis 3 (strong axis) of the frame. It can be seen that the large bending moment is 92.7019 kN.m2.

4) Shell Moment

Shell moment is the internal force that occurs in the plate and wall (shell) structural elements caused by a combination of external loads. bending moment M11 is the force that occurs in the direction of the local axis 1 of the frame. It can be seen that the bending moments are marked with different colors. starting from purple which represents the largest negative moment and 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 particular axis. The largest acting force is 8.0531 kN.

The results of this calculation are an example of the use of structural analysis of multi-storey buildings using ETABS software. The ETABS used is ETABS V.18. The results of the structural analysis carried out show that it is safe against strong earthquakes and meets the requirements that apply to the Indonesian National Standard (SNI). This building is an office building planning in Donggala district, Central Sulawesi, Indonesia. Structure Consultant Ayuddin (SCA) is a building structure analysis consultant in the proficiency of analysis for various types and variations. In addition, the building is calculated to look at as efficient as possible construction costs and safe strength and stability of the structure against strong earthquakes.