东莞水道特大桥设计（Design of super large bridge for Dongguan waterway）.doc

东莞水道特大桥设计（Design of super large bridge for Dongguan waterway） The design of Dongguan Waterway Bridge The Dongguan channel bridge is a large span steel pipe concrete arch bridge, the main span of 280m. This paper introduces the main points of design and calculation of the bridge, a reference for similar bridge design. Keywords concrete filled steel tube truss arch design in Dongguan 1 natural conditions Dongguan area belongs to the tropical monsoon climate, mild climate, adequate light. The relative humidity of 83.1%, the average annual temperature of 21 ~ 220C, the average temperature of July 28.20C, the extreme maximum temperature 37.90C. In January the average temperature of 13.40C, the extreme minimum temperature -0.50C. On the South China Sea basin, affected by the southwest monsoon, the southeast trade winds and strong typhoon activity, rainfall. But because of the terrain is flat, dynamic condition is poor, the rainstorm intensity in general. The average annual rainfall of 1700mm, the maximum annual rainfall of 2442mm, the minimum annual rainfall 1360mm, 12 hour rainfall of up to 259mm. The uneven spatial and temporal distribution of rainfall concentrated in 4 ~ September, accounting for about 80% of the annual rainfall. The local perennial wind for the East, Southeast, followed by the south wind, the maximum wind speed 34m/s. Summer and autumn will be affected by the typhoon, the average annual occurrence of typhoon 1 ~ 3 times, the wind is generally 6 ~ 9, 11 gust, the largest wind up to 12. According to the geological drilling revealed that roughly the same things on both sides of the bridge site geology. The surface is filling soil, the Quaternary alluvial formation of silt, silt and fine sand, coarse sand bars, third strong weathering, weathering and weathered marl, which strongly weathered marl only in the local distribution. Buried depth of bedrock, weathering marlite in 15.2 ~ 21.8m, 18.6 ~ 29.0m weathered marl. Saturated uniaxial compressive ultimate