Investigation and optimization of buckling behavior of uprights and frames used in steel storage rack systems


Thesis Type: Postgraduate

Institution Of The Thesis: Bursa Uludağ University, Fen Bilimleri Enstitüsü, Turkey

Approval Date: 2017

Thesis Language: Turkish

Student: Safa Şenaysoy

Supervisor: YAŞAR PALA

Abstract:

The use of cold-formed steel members in the steel structure industry have been increasing day by day since they have high ratio of strength / weight, low production costs, various cross – section shapes. Due to these properties, cold formed steel members are commonly used as upright, pallet beam and platform rack in storage rack systems. In this thesis, buckling behavior of the cold formed steel uprights with open cross – section used in storage rack system are studied. In addition, the load-carrying capacity of the cold formed steel uprights is investigated. First, buckling behavior of the column used in a storage rack system is investigated using experimental method, finite element method and direct strength method. Then, the study is divided into four groups in order to improve buckling load of column's cross - section. The first of these groups is the group in which the stiffener on the flange is folded at 90o. For this condition, four different distances of the stiffener from the web are considered. In the second group, the column structure with radius perforations is used instead of the column which has cornered perforations. In the third group, the condition in which different depths of stiffener located on the web is considered. In the last group, the column which has the stiffener on the tip of the flange folded at 90o is analyzed. As a result, the cross - section which gives the ultimate critical buckling load is selected by combining the experimental, finite element results and direct strength method.