Abstract: The efective prestressing forces of tied anchorage and total prestressing forces of each tie have specific require- merits of precise controlling．Traditional prestressing construction methods could not satisfy the requirements proposed by de- signer．Efective prestressing forces of tied an chorage at one tied-arch bridge have been tested by diferent checking methods in practice．The test results show that efective prestressing forces of tied anchorage produced by traditional construction method have a large bias comparing with designed values．The phenomena of gliding tendon，uneven tendon forces and total tendon forces on the small side are easily caused by traditional prestressing method．Th e normal work statement of tied-arch bridges are threatened bylackof tiedforces.The studyingresults can be used as guidelinesfor designingand constructingthe same type bridges.

Key words: prestressed concrete, tied-arch bridge：numerical controlled prestressing, steel tubular concrete

摘要： 设计对系杆锚下有效预应力和每根系杆张拉力总吨位控制精度有明确的要求，传统的张拉施工工艺难以达到 设计的要求.现场对某系杆拱桥的锚下有效索力对比测试结果表明：现有方法施工的系杆锚下有效索力与设计值偏 差较大，易造成滑丝、索力不均匀及总的索力偏小的现象，直接威胁系杆拱桥的正常使用.研究结果可为同类型桥梁 的设计和施工提供借鉴.

关键词: 预应力砼, 系杆拱桥, 数控张拉, 钢管砼