大直径钢核心筒稳定性分析  

Stability Analysis of the Large Diameter Steel Core Tube

作　　者：刘慧群[1] 

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》2016年第2期96-100,18,共6页Special Structures

摘　　要：近年来大直径钢筒在高耸结构中得到广泛应用。但由于钢筒径厚比较大,压弯荷载下筒体稳定性较差,极大程度上限制了其承载力的发挥。目前国内外规范对于压弯荷载下的有肋筒体稳定性尚无明确定论。本文以淮安电视调频发射塔筒体为研究对象,进行有肋筒体稳定性分析。分别采用规范估算及有限元分析的方法,对加劲后的核心筒承载力进行分析。结果表明,环肋及纵肋的设置,可大大提高筒体承载能力,使材料强度得到充分发挥。虽然国内外规范仅对无肋筒体及轴压下的有肋筒体稳定进行了规定,但设计时可参照此规定,对压弯荷载下的有肋筒体进行承载力估算,并采用有限元软件验证,以确保结构安全性。Recently,large diameter steel tube has been widely used in high-rise structures.Because of the high diameter-thickness ratio,the poor stability of the tube in the composite force condition was the main factor that influences the bearing capacity.There is no clear conclusion about the stability capacity of the rib tube under the composite force condition.In this paper,the tube of Huaian Broadcast and TV tower was used to study the stability of the rib tube.The standard estimate and the finite element method was used to study the bearing capacity of the steel tube.The result shows that the circumferential ribs and the longitudinal ribs can increase the bearing capacity largely.The standards about the stability of the tube without ribs and the ribbed tube in the axial pressure can be used to estimate the stability of the structure.The finite element method can be used to verify the stability capacity of the tube to ensure the safety of the structure.

关 键 词：大直径钢筒 加劲肋 稳定分析 有限元 

分 类 号：TU973.13[建筑科学—结构工程]