Wind-induced fatigue analysis of diagrid structural system for high rise steel buildings

Abstract

Tall buildings are being constructed across the globe at an ever-increasing rate. The main reason for this is increasing population and paucity of land. Structural design of high-rise buildings is mainly governed by lateral loads due to wind or earthquake. Wind and earthquake loads are uncertain and random in nature. It is difficult to predict them correctly. Loadings on high-rise structures are different from low rise structures. Wind load is a major concern to high-rise structures, which not only causes vibration but may bring fatigue problems as well. To address this issue, in this paper an attempt is made to use, the equivalent structural stress method for the fatigue life assessment of a diagrid high-rise steel structure. Extended 3D Analysis of Building System (ETABS) 2017 software is used for modeling and analysis of structural system. By using the analysis results maximum stressed beam to column connection is identified. The finite element model of a welded beam to column joint is modeled and the corresponding loading is applied. ANSYS software is used for the finite element modeling and analysis. The results are presented and conclusions drawn show that the equivalent structural stress method is a mesh-insensitive method and it has the capability of unifying different stresslife curves (S-N curves) into a single master S-N curve.