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Abstract
The object in this graduation project is a simply supported three-span girder bridge ( 10¡Á30m) i. The bridge is straight on the plane with 300 metres in length and 10 meters in width.The bridge is a part of a highway which the design load is Highway-I-level. The main beam is made up of 5 T-beams that are 1.5m high and the adjacent beams are linked by pouring wet joint with 4cm in width between the two beams. Substructure is made up of circular section piers with a diameter of 1.5 and circular section bored pouring pile foundation with a diameter of 1.8 m, the pilings of foundation are embedded into the intack moderately differentiated rock with a depth of 5.4m. The concrete gravity abutment is 6.5m high with a type of U and supported by pile foundation. Analysis of superstructure in the bridge be done by hand. Simply supported single T-beam is used as analysis model in the program, only one edge beam is analysed and the mid beam using the same result in analyzing on safe side. Transverse distributing coefficient can be exported by using Dr bridge 3.0. The calculations include bending moment diagram, shear force diagram and maximum stress under basic/long-term/short-term load combination. According to the calculations, checking of capacity and performance of normal use of the beam have been done. Checking of capacity/crack width/shear strength of bent cap, capacity /crack width of piers and piles are done by Dr bridge 3.0.
According to the calculation results, the bridge designed in this graduation project was safe, economical and reasonable, and it is qualified for the present bridge design specifications .
Keywords:Bridge;Load combination; Inner Force; Capacity
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