某体育馆屋面预应力大梁梁端破坏事故分析  

Failure Analysis of Prestressed Beam End on the Roof of a Gymnasium

作　　者：周先财 ZHOU Xian-cai(Jiangsu Xinzhu Prestress Civil Engineering Co.,Ltd,Nanjing Jiangsu 210000 China)

机构地区：[1]江苏新筑预应力工程有限公司,江苏南京210000

出　　处：《江苏建筑》2020年第5期25-26,35,共3页Jiangsu Construction

摘　　要：文章以某体育馆屋面预应力大梁为对象,分析了预应力筋张拉时梁端混凝土产生局部破坏的原因。指出梁端附加防劈裂裂缝钢筋和附加防端面裂缝钢筋的缺失可能是事故的主要原因,继而对比了GB50010—2010和DAfStb.Heft—240中的梁端附加钢筋的计算方法和配筋区域,并给出了相应的预应力大梁梁端设计施工的改进建议,可供类似工程借鉴。In this paper,the prestressed girder on the roof of a gymnasium is taken as an example to analyze the cause of local damage of the concrete at the beam end when the prestressed reinforcement is tensioned.It is pointed out that the main cause of the accident may be the lack of additional reinforcement of anti split crack and anti end face crack at the beam end.Then,the calculation method and reinforcement zone of additional reinforcement at the beam end in GB50010—2010 and DAfStb.Heft—240 are compared,and the corresponding improvement suggestions for the design and construction of the prestressed beam end are given,which can be used for reference by similar projects.

关 键 词：预应力混凝土 梁端 劈裂裂缝 端面裂缝 

分 类 号：TU378.2[建筑科学—结构工程]