体外预应力技术在玻璃采光屋面钢梁加固中的应用  

Application of External Prestressing Technology in the Steel Beam Reinforcement of Glass Lighting Roof Structure

作　　者：杨学中[1] 刘航[1] YANG Xuezhong;LIU Hang(Beijing Building Construction Research Institute Co.,Ltd.,Beijing 100039,China)

机构地区：[1]北京市建筑工程研究院有限责任公司,北京100039

出　　处：《施工技术》2021年第3期37-39,共3页Construction Technology

基　　金：住房和城乡建设部科技计划:新型半刚性自复位节点预制装配式混凝土结构抗震性能研究(2017-K9-055);北京市科技计划:既有建筑结构安全性加固综合技术服务(Z111106055111013)。

摘　　要：内蒙古赤峰市文冠庄园展示中心玻璃采光屋面采用主次钢梁承重体系,针对主梁挠度超限、屋面大范围不均匀变形等问题,采用体外预应力技术对钢梁进行加固,沿屋面主梁下方设置竖向钢撑杆和体外预应力拉索,将原主次钢梁改造为张弦梁结构,通过拉索张拉预应力减小主梁挠度。工程实践表明,体外预应力技术可有效减小主梁挠度,改善钢梁受力状态。Glass lighting roof of Wenguan Manor Exhibition Center,Chifeng City,Inner Mongolia,adopted primary and secondary steel beam bearing system.In view of the main beam deflection over-limit,roof wide range of uneven deformation and other problems,the external prestressing technology was used to reinforce the steel beam.Vertical steel struts and external prestressed cables were arranged below the roof main beam to transform the original primary and secondary steel beam bearing system into a beam string structure.The deflection of the main beam was reduced by cable tensioning.The engineering practice shows that external prestressing technology can effectively reduce the deflection of the main beam and improve the stress state of steel beam.

关 键 词：屋面 钢梁 张弦梁结构 体外预应力 加固 复位 

分 类 号：TU758[建筑科学—建筑技术科学]