施工阶段预应力梁斜裂缝的产生与分析  

Oblique crack during construction and analysis

作　　者：巢斯[1] 易发安[1] 黄鼎业[1] 孙海[1] 

机构地区：[1]同济大学建筑设计研究院,上海200092

出　　处：《四川建筑科学研究》2001年第1期36-38,共3页Sichuan Building Science

摘　　要：通常预应力框架结构在施工中由于预应力度过大会发生较大反拱 ,从而使得受拉区出现竖向裂缝 ,对于出现斜裂缝极少遇见。本文作者通过对一幢新建成的框架结构在预应力施工过程中出现的这种反常的非常严重的斜裂缝进行分析 ,发现预应力结构在施工过程中如果预应力筋的选型不合理会使得梁在反弯点处的剪力很大 ,甚至会超过设计剪力值 ,同时分析了出现这种斜裂缝的几个前提条件 ,这几点都被本文所涉及的这幢建筑物碰见了。通过分析 ,作者得出一些有用的结论 ,可以有效地预防此类事故的再次发生。Usually we can meet perpendicular crack when a structure is under construction,this is because we use great prestress loads.In this paper a bad oblique crack appeared during construction which was very uncommon,the author analysis this phenomenon and found that when the shape of prestressed tendon is not correctly used when design the shear force will be very high in the point of zero-moment,even higher then the design value.But it has several premise,unluckily these elements were all met by this structure.Though analysis the author proposed some useful suggestion on designing in order to avoid this accident.

关 键 词：斜裂缝 预应力施工 梁 工程施工 

分 类 号：TU757.4[建筑科学—建筑技术科学]