广东清远北江四桥工程主桥超高性能混凝土-钢组合桥面板结构设计

Design of Ultrahigh-toughness Concrete – Steel Composite Deck Structure of Main Bridge in Guangdong Qingyuan Beijiang River Bridge IV Project

广东清远北江四桥主桥采用单索面宽幅支承体系混合梁斜拉桥,而钢箱梁存在钢桥面铺装层易破损和钢结构疲劳开裂的通病难题,为解决其难题,主桥钢箱梁桥面采用超高韧性混凝土-钢组合桥面板,着重介绍了北江四桥主桥钢箱梁超高性能混凝土-钢组合桥面板结构构造,并采用了有限元对其进行了受力分析,计算结果表明超高韧性混凝土有效降低钢桥面结构的应力及变形,并改善铺装层的受力状况。

The main bridge of Guangdong Qingyuan Beijiang River Bridge IV is a single-plane width supporting system composite beam cable-stayed bridge. The steel box beam has the common problems of easily damaged steel deck pavement and the fatigue cracking steel structure. In order to solve the difficulties,the ultrahigh-toughness concrete-steel composite deck plate is used for the steel box beam deck of the main bridge. The article focuses introduction on the structural construction of ultrahigh-toughness concrete-steel composite deck plate of the main bridge for Beijiang River Bridge IV. The finite element is used to analyze its stress. The calculation result shows that the ultrahigh-toughness concrete can efficiently reduce the stress and deformation of steel deck structure, and improve the stress status of pavement.