京福高速公路兰圃互通B匝道第一联受力分析与加固措施

Analysis and Reinforce Measure for Ramp B of Lanpu Interchange of Jingfu Expressway

兰圃互通是京福国道主干线与同三国道主干线在福州的交叉点上的1座大型互通立交。它由一系列的弯梁桥组成,在施工过程中出现了支座上翘、梁体爬行等问题。为此在2004年年底通车前对该桥进行了静动载试验和加固。介绍其B匝道第1联桥的静动载试验、有限元分析和根据分析结果提出的加固方案。

The Qingkou Bridge is an interchange connecting two national expresswaysthe BeijingFuzhou Expressway and the TongjiangSangya Expressway in Fuzhou,China.It composes of a series of curved prestressed concrete bridges.During the construction,some unsafe problems occurred,such as the beam uplift at the support and deformation in longitudinal and transverse directions at the joints.The site inspection,field tests and reinforcement were carried out on the bridge before it was open to traffic in 2004.The static and dynamic tests,analytical studies and reinforcement schemes on the No.1 Beam at Bramp were proposed and discussed in this paper.