Evaluasi Kondisi Kebulatan Struktur Dinding Silo Penyimpan Biji Gandum Berkapasitas 4650 Ton

Abstract

This paper discusses the evaluation of asymmetrical inflating pattern phenomenon on the silo wall due to loading. The wall structure used corrugated wall modules with bolted connections. The storage capacity of the observed silo is 4,650 tons of wheat grains with a diameter of 19 m and a height of 20.875 m. Numerical analysis was performed using the finite element method. The condition of the bolt connection is directly measured using a torque wrench. Measurement and analysis is carried out when the silo is full or empty. The measurement results show that the bolt tightening torque in the full capacity loading of grain is about 2 times than that of when empty. This indicates that the silo walls are subjected shear stress of bolts on the overlap area between wall modules. The asymmetrical inflating pattern of the silo wall during loading is caused by the variation of the bolt tightness torque at the connection between the wall modules. The calculation results show that the minimum bolt tightness torque to produce friction stress (in the overlap area between wall modules) which is equal to the grain pressure stress is 47.36 Nm.