多因素作用下风荷载简化对高墩垂直度影响分析  

Effect of Wind Load Simplification on the Vertical Degree of High Pier under the Action of Multiple Factors

作　　者：王军[1] 漆久亮 张刚领 张麒 高凯 WANG Jun;QI Jiuliang;ZHANG Gangling;ZHANG Qi;GAO Kai(China Construction Fourth Engineering Bureau Zhuhai Branch,Zhuhai 519000,Guangzhou,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]中国建筑第四工程局有限公司珠海分公司,广东珠海519000 [2]重庆大学土木工程学院,重庆400045

出　　处：《重庆交通大学学报（自然科学版）》2020年第5期58-64,共7页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：中建四局科技课题(CSCEC4B-2018-KT-24)。

摘　　要：高墩在施工期间受到几何初始缺陷、施工偏载以及风荷载等作用,桥墩可能产生偏位,从而对高墩的承载力带来不利影响。通过现行规范计算模拟得到梯形风荷载简化模型,在考虑几何非线性的条件下,基于弹性稳定平衡微分方程,推导出高墩墩顶的偏位计算公式。在此基础上,为便于现场施工应用,选取5个现有高墩为研究对象,在弹性稳定理论条件下对通过梯形风荷载简化模型所得公式进行简化,详细分析高墩在考虑几何非线性时多因素耦合作用对高墩垂直度的影响。结果表明:梯形风荷载简化模型计算结果与实际风荷载有限元模拟结果较为吻合,更符合实际的风荷载特点,为高墩施工中考虑风荷载影响及墩顶侧移控制提供了方法支撑和切实可行的技术手段。The high pier is affected by geometrical initial defects,partial load of construction and wind load during the construction period,and the piers may be misaligned. Therefore,the bearing capacity of high pier is adversely affected. The simplified model of trapezoidal wind load was obtained through the calculation and simulation of the current code. The misalignment calculation formula of the top of high piers was derived based on the elastic stable equilibrium differential equation,with the consideration of geometrical nonlinearity. On this basis,in order to facilitate the application of site construction,five existing high piers were selected as the objects of study. Under the condition of elastic stability theory,the formula of the simplified model of trapezoidal wind load was simplified,and the influence of multi-factor coupling on the vertical degree of the high pier was analyzed in detail,with the consideration of geometrical nonlinearity. The results show that the results of the simplified model of trapezoidal wind load agree well with the results of finite element simulation of actual wind load,which is more in line with the characteristics of actual wind load. It provides method support and practical technical means for considering the influence of wind load and the control of pier top lateral displacement in the construction of high pier.

关 键 词：桥梁工程 桥梁高墩 几何非线性 几何初始缺陷 施工偏载 梯形风荷载简化模型 

分 类 号：U448.23[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]