RECONSTRUCTION OF THE CLOSURE SEGMENT OF MAIN SPAN IN EXISTING PRESTRESSED CONCRETE CABLE-STAYED BRIDGES

摘要：

　　Aiming to repair the failure of the joint between the closure segment and its adjacent segments located at the main span of existing prestressed concrete cable-stayed bridges,a strengthening method,named as reconstruction of the closure segment,was put forward.There were three key techniques in this method,that is,reliable new-to-old concrete bonding,rehabilitation and enhancement of prestressing in the new closure segment.Several technical measures for ensuring new-to-old concrete bonding were systematically introduced,as well as a structural optimization method for controlling the tension of prestressing steel bars in the new closure segment.In addition,the stress condition of the new closure segment was improved by enlarging section and external prestressing tendons,and the design calculation model was established.A engineering practice,the repair of Yonghe Bridge,demonstrated the remarkable effects of this strengthening method.

关键词： Prestressed concrete cable-stayed bridges new-to-old concrete bonding external prestressing enlarging section closure segment

作者: Hongjiang Li Jinquan Zhang Wanheng Li Hanliang Wu

作者单位: Research Institute of Highway, The Ministry of Communications, Beijing 100088, P.R.China

会议类型: 国际会议

会议名称: The Twelfth International Symposium on Structural Engineering (第十二届结构工程国际研讨会)

会议地点: 武汉

会议语种:英文

页码: 539-545

在线出版日期: 2012-11-17（万方平台首次上网日期，不代表论文的发表时间）