Damage Detection in Truss Structures Using Grasshopper Optimization Algorithm

Pouria Foroutanrad ¹ (Department of Civil Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran.)
Behnam Adhami ² (Assistant Professor, Civil Engineering Department, Faculty of Civil & Earth Resources Engineering, Islamic Azad University Central Tehran Branch, Tehran, Iran)

Submited date : 2023-08-06 accepted date : 2023-10-27

Keywords: Natural frequency, Objective function, Damage Detection, Optimization Algorithms, Truss Structure, Structural Dynamic Response,

Abstract :

Structural engineers' goal has constantly been identifying, restoring, repairing, or replacing damaged members. As a result, one of the most crucial and necessary steps in the upkeep and restoration of structures is identifying damaged members. Damage detection techniques from structural dynamic response measurements can often be used to detect and locate damage. This paper proposes a structural damage identification method based on changing natural frequency, finite element modeling, and the Grasshopper Optimization Algorithm (GOA). This algorithm mathematically models and mimics the behavior of grasshopper swarms in nature for solving optimization problems. As numerical examples, the 13-bar and a 31-bar planar truss are considered to examine the suggested methodology's precision. According to the findings, the recommended method is workable for systems with few members and minor damage. However, the accuracy of the diagnosed damage in structures with medium-sized members and considerable damages was poor, making it more likely to converge to local optimum points conditions.