基于新版《公路钢筋混凝土及预应力混凝土桥涵设计规范》的桥梁抗倾覆设计分析  

Analysis of bridge anti-overturning design based on new version of “Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts”

作　　者：李贵峰[1] LI Guifeng(Tianjin Municipal Engineering Design and Research Institute,Tianjin 300457,China)

机构地区：[1]天津市市政工程设计研究院

出　　处：《渤海大学学报（自然科学版）》2019年第3期263-268,共6页Journal of Bohai University:Natural Science Edition

摘　　要：新版《公路钢筋混凝土及预应力混凝土桥涵设计规范》JTG 3362-2018(以下简称新《桥规》)中首次明确规定了桥梁抗倾覆设计的计算方法.本文对新《桥规》进行了解读,阐述了桥梁倾覆的破坏特征状态,并以3×30 m连续箱梁为计算实例,分析影响桥梁倾覆稳定的因素,比如支座布置形式、支座间距、曲线半径等,得到如下结论:同样条件下,直线桥的倾覆稳定系数大于曲线桥,且随着曲线半径的逐步减小,曲线桥抗倾覆稳定系数也逐渐减小;支座间距对桥梁倾覆计算的影响最大,且随着支座间距的增大,倾覆稳定系数显著增大.The calculation method for the anti-overturning design of bridges is clearly defined for the first time in the new edition of“Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts”JTG 3362-2018(the new“Bridges Specifications”).In this paper,the new“Bridges Specifications”is interpreted,and the failure characteristics of the bridge overturning are expounded.The 3×30 m continuous box girder is taken as an example to analyze the factors affecting the stability of the bridge,such as the arrangement of the supports,the spacing of the supports,and the radius of the curve,etc.The conclusions are as follows:Under the same conditions,the overturning stability coefficient of the linear bridge is larger than that of the curved bridge,and with the gradual decrease of the radius of the curve,the anti-overturning stability coefficient of the curved bridge is also gradually reduced;the bearing spacing has the greatest influence on the bridge overturn calculation,and the overturning stability coefficient increases significantly with the increase of the bearing spacing.

关 键 词：桥梁倾覆 特征状态 倾覆稳定系数 支座布置 支座间距 曲线半径 

分 类 号：O175.2[理学—数学]