双肢薄壁墩连续刚构桥平衡悬臂施工阶段的三维风效应研究  

WIND LOADS AND EFFECTS OF RIGID FRAME BRIDGES WITH TWIN-LEGGED HIGH PIERS AT BALANCED CANTILEVER ERECTION STAGES

作　　者：韩艳[1,2] 陈政清[2] 刘光栋[2] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410076 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《工程力学》2008年第10期141-149,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(50478051)

摘　　要：该文首先提出了双肢薄臂墩连续刚构桥在平衡悬臂施工阶段的结构模型。为了充分考虑作用在主梁和桥墩上的风荷载,提出了三维效应的风荷载模型,包括垂直于桥梁纵平面的平均风、自然脉动风和结构尾流漩涡脱落共同引起的风荷载。然后基于随机振动理论和频域分析方法,利用影响函数计算平均风荷载静风响应和脉动风荷载的背景响应。由结构的主要振型的振型系数,利用主要振型计算每阶振型的脉动风荷载的共振响应。该文给出了具体的计算公式。最后,计算了贵阳小关桥3号墩墩底的内力,计算结果显示,不同的荷载分量提供不同的作用,表明充分考虑风荷载的三维效应是非常有必要的。This paper presents a theoretical model of rigid flame bridges with double thin-wall piers during balanced cantilever erection stages with consideration all wind effects both on the beam and the piers. The wind loads of the model include the mean wind load and the load induced by all the three turbulence components and by the vortex shedding. Based on the stochastic vibration theory and the frequency-domain method, the response of the mean wind load and the background response of the fluctuating wind load are calculated by using the influent function. The resonant response of the fluctuating wind load are calculated by using the main mode shapes of the structure. The theory and formulations are proposed in this paper, and were verified by the 3rd pier of the Xiaoguan Bridge. The numerical results show that the effects of different loading components are different, and the results will be more security and accurate if the effects of each loading component were considered.

关 键 词：连续刚构桥 双肢薄壁墩 平衡悬臂施工 二维风荷载 风响应 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]