This paper addresses a comprehensive design of RCC T-beam Bridge based\non AASHTO design standards. The bridge is designed and proposed to be\nconstructed over an irrigation canal (Zahirshahi canal) of Kandahar province,\nAfghanistan that has more than 30 bridges over it. Yet they are not enough,\nand the demand for construction of new bridges is gradually arising because\nof the vast urbanization in the surrounding of the canal. Most of the bridges\non this canal are Reinforced Concrete Slab (RCS) bridges; these type bridges\nare limited by capacity and are generally found only in smaller spans. Since\nthey can only span short distances and are often constructed as multiple-span\nbridges with vertical supports between the abutments to allow a longer length.\nAll constructed slab bridges over Zahirshahi canal are four-span bridges.\nConstructing multi-span bridges on the canal decreases waterway due to the\nexistence of many piers and footings that could increase the water level\nduring the peak flow, even, sometimes can cause over flow. Taking into\nconsideration these deficiencies of the present (RCS) bridges, two-span RCC\nT-beam Bridge is one of the best alternatives to be constructed over the canal.\nIn addition, canal cross-sectional dimensions are almost constant along its\nlength, though the construction of two-span RCC T-beam bridge is applicable\nat any point of the canal. The design is selected based on exclusive survey of\nthe area during all seasons including the peak flowing of the canal.
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