摘要
为了研究钢-混凝土连续组合箱梁自振特性,以哈密顿原理为基础,综合考虑连续组合箱梁剪力滞、滑移、剪切变形和转动惯量等多重因素的影响,推导出连续组合箱梁的控制微分方程及自然边界条件,提出一种能对工程中常用连续组合箱梁自振特性进行分析的计算方法。研究结果表明:构造的位移函数是正确和可靠的,所得计算公式比以往连续组合梁自振特性的计算理论有一定发展;界面滑移刚度对钢-混凝土连续组合箱梁自振频率影响很大,不能忽略;在剪力滞效应的作用下,连续组合箱梁的自振频率普遍减小,且剪力滞效应对连续组合箱梁自振频率的作用随频率阶次的升高而变大,随滑移刚度的增加而增大,当阶次较高且滑移刚度较大时,剪力滞效应的影响超过5.5%,不可忽视。
In order to study the free vibration characteristics of steel-concrete continuous composite box girder, based on Hamilton principle, the governing differential equations and the corresponding boundary conditions of steel concrete continuous composite box girder were deduced with consideration of the shear lag effect, slip, shear deformation and rotational inertia. A new method was proposed for analyzing the free vibration characteristics of steel-concrete continuous composite box girder. The results indicate that the structure displacement functions are reasonable and reliable. The obtained formulas have developed the free vibration characteristics theory of steel-concrete composite box girder. The influence of the interface slip on natural frequency of the steel-concrete continuous composite box girder is great, which cannot be ignored. The natural frequency of under the action of the shear lag ef increases when the frequency order the shear lag effect exceeds 5.5 % cannot be ignored. the steel-concrete continuous composite box girder decreases fect. The shear-lag effect of continuous composite box girder rises and when the slip stiffness increases. The influence of when the order is high and the slip stiffness is great, which
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2013年第5期88-94,共7页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51078355
50938008)
教育部博士研究生学术新人奖项目(094801020)
湖南省博士生科研创新项目(CX2011B093)
中央高校基本科研业务费专项资金项目(20117Q008)
中南大学优秀博士生奖励助学金项目(2011ybjz031)
关键词
桥梁工程
钢-混凝土组合连续箱梁
哈密顿原理
剪力滞效应
剪切变形
滑移
bridge engineering
steel-concrete continuous composite box girder
Hamilton principle
shear lag effect
shear deformation
slip
