新旧规范对早期广播电视发射塔安全评估探讨  

Safety Assessment of Early-built Television Transmission Towers Based on Previous and Current Design Codes

作　　者：刘慧群 Liu Huiqun(Architectural Design&Research Institute of Tongji University(Group)Co.,Ltd.,200092,China)

机构地区：[1]同济大学建筑设计研究院(集团)有限公司,200092

出　　处：《特种结构》2023年第2期89-93,99,共6页Special Structures

摘　　要：国内部分早期广播电视发射塔已服役近30年,出现螺栓松动、构件腐蚀等现象需对其进行安全评估。然而经过近半个世纪的发展,《高耸结构设计标准》关于风荷载的分项系数、重现期、风压高度变化系数、风振系数、体型系数等均有所改动。本文对比《高耸结构设计规范》GBJ 135—90、GB50135—2006、GB 50135—2019中风荷载计算方法的差异,并以东吴塔为研究对象,分别采用新旧规范计算结构风荷载,对结构进行受力分析,分析构件应力比的变化。结果表明,新规范计算所得风荷载是旧规范的0.83~1.1倍。新旧规范东吴塔总风荷载变化不大,约2.7%,但在风荷载及分项系数二者共同影响下,构件最大应力比为0.985,增幅达15%,虽然满足规范应力比小于1.0的要求,但仍需定期对结构进行检测,以防结构出现破坏。Some early-built television transmission towers in China have been in service for nearly 30 years.The safety assessment of structural is required when loose bolts,corroded components are occurred.However,after nearly half a century of development,the partial factors of wind load,return period,height variation factor,gust factor,and shape coefficient in the"Design Standards for Towering Structures"have all been revised.In this paper,the differences in the wind load calculation in GBJ 135-90,GB 50135-2006,and GB 50135-2019 of u Code for Design of Towering Structures''are compared.Taking Dongwu television transmission tower as the research object,the structure member stress,and stress ratios are analyzed based on previous and current design codes.The results show that the wind load calculated by the current code is 0.83 to 1.1 times that of the previous code.The total wind load based on the pervious and current codes has not changed much,about 2.1%.However,under the joint influence of wind load and partial factors,the maximum stress ratio of structure components is 0.985,which is 15%higher.The stress ratio is less than 1.0,meeting the code requirements.However,the tower should be inspected regularly to prevent structural damage.

关 键 词：新旧规范 广播电视发射塔 安全评估 风荷载 应力比 

分 类 号：TU973.213[建筑科学—结构工程]