Pallet rack structure is known as a storage system that use in the industrial to store the goods. Pallet rack structure consist of many bays with each identically load with the same beams and upright sections. The goods are randomly placed on or take off from the pallet rack structure. Therefore, loads arrangement of the rack structure will create various of pattern loadings. Under various of these pattern loading, an investigation of effect of loads at different places on pallet rack structure was carried out to assess the structure behaviour of the pallet rack.