连续钢桁架叠合梁桥面板裂缝控制技术

Control Technology of Bridge Deck Crack in Continuous Steel Truss Composite Beam

宁波梅山春晓大桥工程水中引桥采用3×72 m连续钢桁架叠合梁结构。连续结构钢-混凝土叠合梁设计时,重点需要解决结构墩顶开裂的问题。论述了常规钢-混凝土叠合梁控制墩顶裂缝的方法,结合春晓大桥工程实际,对其采用的控制墩顶混凝土桥面板裂缝的措施进行了论述。同时,针对采用预制混凝土桥面板结构的叠合梁墩顶裂缝计算过程进行了简要说明。该工程主要采用了调整支点高度方法,计算表明,该方法对控制墩顶裂缝宽度是有效的。

The 3×72 m-span continuous steel truss composite beam structure is adopted in the water approach bridge of the Meishan Chunxiao Bridge in Ningbo.In the design of continuous steel-concrete composite beam,it is necessary to solve the cracking problem at the top of structural pier.In this paper,the conventional method of controlling the cracks at the pier top of steel-concrete composite beam is discussed,and the measures to control the pier top cracks of concrete bridge deck are discussed by the engineering practice of Chunxiao Bridge.At the same time,the calculation process of pier top crack of composite beam for the prefabricated concrete bridge deck structure is briefly described.The adjusting method of the fulcrum height is used in this project.The calculation shows that this method is effective for controlling the crack of pier top,which can be referred for the design of the similar projects.