钢管混凝土拱桥环境温度引起的应力挠度分析  

Analysis of stress and deflection of concrete-filled steel tubular arch bridge caused by ambient temperature

作　　者：王新泽[1] 

机构地区：[1]中铁十八局集团第二工程有限公司,河北唐山063000

出　　处：《铁道建筑》2016年第2期39-42,共4页Railway Engineering

基　　金：住建部科学技术项目(2015-K3-021);天津市自然科学基金项目(13JCYBJC19600);天津市交通运输委员会科技项目(2014-23)

摘　　要：分析了钢管混凝土拱的挠度和拱趾处应力随环境温度改变而产生的变化。结果表明:环境温度引起的轴向应力和拱肋自重引起的轴向应力绝对值均不超过100 MPa;拱肋截面应力变化并非同步,而是存在一个弯曲效应,环境温度每变化5℃引起拱顶竖向位移变化17 mm;由当地最高温度引起的拱顶挠度变化为向上55.6 mm,由当地最低温度引起的拱顶挠度变化为向下135.6 mm;由环境温度变化引起的竖向高差不均匀是高速列车行驶的安全隐患,不可忽略。In this paper,the deflection of concrete-filled steel tube arch and the stress distribution at the arch springing were analyzed due to the temperature effect. The results show that the axial stress due to temperature effect and selfweight is less than 100 MPa. The stresses of each part of the arch section are not synchronous and there is a bending effect. As the ambient temperature changes every 5 ℃,there is a 17 mm vertical displacement at the arch crown. The maximum upward deflection caused by the local highest temperature is 55. 6 mm while the maximum downward deflection caused by the lowest temperature is 135. 6 mm. The vertical def lection caused by temperature change may threaten the safety of the operation of trains.

关 键 词：钢管混凝土拱桥 环境温度 挠度 温度应力 西溪河大桥 

分 类 号：U448.222[建筑科学—桥梁与隧道工程]