Comparison between required and provided reinforcement in villa design at Muscat area during the period 2000-2005
مؤلف
Al-Mazruiyah, Khoula Moosa Salem.
الملخص الإنجليزي
A comparison between required and provided reinforcement in villa design at Muscat area during the period 2000-2005 was conducted in this research. The comparison included structural re-design of 20 villas using the same geometry and material strengths provided in the drawings approved by Municipality drawings. The only variable was the amount of reinforcement. The aim was to investigate the possibility of over-design structures in villa design in Muscat area, Sultanate of Oman. The 20 villas were designed using STAAD-Pro software and the Reinforced Concrete Council Design Spread sheets to BS8110:97. The reinforcement found in the drawings was called the provided reinforcement while the reinforcement resulted from the redesign process was called the required. The selected villas for redesign were scattered in different locations in Muscat area and were designed by different consultants of small to medium size offices. All drawings were approved for construction during the period 2000-2005. The slabs and footings were designed using RCC spread sheets while the frame analysis and design of beams and columns were done using STAAD-Pro commercial structural design software. The weight of the required and provided reinforcement was calculated for twenty villas using an in-house Spread Sheet Program developed by Dr. Ali S. Alnuaimi. A clear case of over-design was found in all villas. Some individual members were under-designed indicating inconsistency in the use of the code or improper structural design. There was no clear trend or reduction in the differences between the required and provided reinforcement over the time which indicates almost no improvement in the design process over the years from 2000 to 2005. The percentages in differences between the required and provided reinforcement in the total amount of reinforcement of the whole villa ranged from 26 to 105 %. The percentages in differences in the total amount of reinforcement for slabs of each villa ranged from 27 to 136 %. The percentages in differences in the total amount of reinforcement for beams of each villa ranged from 26 to 103 %. The percentages in differences in the total amount of reinforcement for columns of each villa ranged from 3 to 78 %. The percentages in differences in the total amount of reinforcement for footings of each villa ranged from 20 to 124 %.
