Vibration Analysis of Multi-Story Structures

Abstract

To determine the dynamic characteristics and properties of an object, Modal analysis, and Harmonic response analysis both are quite essential tools. Natural frequency is a significant dynamic parameter as every structure in the world vibrates with a high amount of amplitude at its natural frequency. For improving a structure’s strength, reliability, and durability at its design stage or pre-production stage at variable operating conditions we need to know and determine the modal parameters of an object. Those modal parameters are natural frequency, mode shape, and damping characteristics. By determining those parameters, we will be able to know the actual structural and dynamic properties of an object. In this paper, we work with a two-story and threestory structure by giving different force conditions and boundary conditions. The paper clarifies the dynamic and structural behavior of the two-story and three-story structures by performing Modal analysis and harmonic response analysis with the assist of FEM (Finite Element Method). The analysis is completely based on the simulation process. No experimental analysis has not conducted due to some circumstances. By determining as well as observing the dynamic characteristics of the two stored and three stored structures we have been able to relate and predict the properties of those structure’s behavior during an earthquake consequence. We have been able to find that out by giving a base structure at the downward side of those structures as well as giving some horizontal forces to that base structure. Along with all of these analyses, we have shown a generic comparison among the structures at different operating conditions by giving different kinds of masses at different locations of the structures.