Design of Main Girder of Non-navigable Bridges of Shenzhen-Zhongshan Link in Flood Diversion Zone
The non-navigable bridges in the flood diversion zones that create connections among the Lingdingyang Bridge,Zhongshan Bridge and approaches have a total length of 6.05 km.These bridges consist of multiple equal spans,with expansion joints installed every four to six spans.At the design stage,three span lengths of 110,120,and 130 m were compared,and the 110 m-long spans were proved the ideal choice in terms of economy.Three types of girders,including the prestressed concrete girder,the steel-concrete composite girder and the steel box girder,were compared from perspectives of mechanical properties,economy and construction hazards,and the streamlined steel box girders that would facilitate future maintenance were selected.Given the landscaping effect of the entire crossing,the depth of steel box girders was determined to be 4 m,leading to a girder depth to span length ratio of 1/27.5.The center-to-center spacing of the solid diaphragms is 2.5 m.Framed transverse stiffeners are utilized to provide open views inside the box girders.The steel box girders are made of Q420qD and Q345qD steel.To ease the construction,the steel box girders were first fabricated into large segments off site and delivered to the bridge site for assembly.
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