土木工程与管理学报2017，Vol.34Issue(4)：39-46,8.
基于体外预应力加固的简支梁束界
Cable Zone for Simply Supported Beams Strengthened by External Prestress
摘要
Abstract
As an active strengthening method, the external prestressing technique has been widely used in bridges strengthening.For prestressed concrete member, with a rational shape of prestressed strands, bearing capacity and the performance of structures can be ensured.Aimed at research in cable zone of simply-supported beam strengthened with external prestressed strands, the concept of cable zone of simply-supported beam strengthened with external prestressed strands has been put forward.Based on current specification, controlling condition of cable zone to all kinds of prestressed concrete member was presented and the analytical solutions to external cable zone are acquired.Moreover, the concept of prestressed strands service efficiency was put out, by what further demarcation to external cable zone can be conducted.Finite element modeling was employed to analyze the strands service efficiency and stress of various external strands layouts that based on analytical cable zone, the results showed that the cable zone is safe and effective that both crack resistance requirements in service stage and stress requirements in external prestressing tensioning stage can be satisfied;the service efficiency of internal prestressed strands decreased while which of external prestressed strands increased with the increase of external strands eccentricity.关键词
体外预应力加固/束界/偏心距/使用效率Key words
strengthening by external prestressing/cable zone/eccentricity/service efficiency分类
交通工程引用本文复制引用
张军凌,张忠,周文玮,王建华,高荣雄,乐颖..基于体外预应力加固的简支梁束界[J].土木工程与管理学报,2017,34(4):39-46,8.基金项目
国家自然科学基金(51678264) （51678264）
福建省交通运输科技发展重点项目(201435) （201435）
