风荷载作用下施工栈道钢管桩施工稳定性分析  

Analysis on stability of steel-pipe pile for construction catwalk during construction under wind load

作　　者：谢晓鹏[1] 窦国涛 杨露 高波[3] 李晗[1] XIE Xiaopeng;DOU Guotao;YANG Lu;GAO Bo;LI Han(School of Civil Engineering and Architecture,Zhengzhou University of Aeronautics,Zhengzhou 450046,Henan,China;College of Civil Engineering,Henan University of Engineering,Zhengzhou 451191 ,Henan,China;Jiangsu Provincial Transportation Engineering Group Co.,Ltd.,Zhenjiang 212100,Jiangsu,China)

机构地区：[1]郑州航空工业管理学院土木建筑学院,河南郑州450046 [2]河南工程学院土木工程学院,河南郑州451191 [3]江苏省交通工程集团有限公司,江苏镇江212100

出　　处：《水利水电技术》2019年第9期98-107,共10页Water Resources and Hydropower Engineering

基　　金：河南省科技攻关项目(182102310721);国家自然科学基金青年基金项目(51708514)

摘　　要：针对钢管桩上下部剪力撑不同施工次序所引起的风荷载响应问题,为了揭示施工过程中风荷载对钢管桩稳定性的影响规律,以黄河大桥施工栈道钢管桩施工过程为背景,采用谐波叠加法合成了风荷载,对钢管桩不同施工次序中风荷载的影响进行了分析研究.结果表明:钢管桩施工过程中,风荷载的作用会使钢管桩产生位移;当下部剪力撑焊接完毕而上部剪力撑未焊接时,风荷载作用下桩顶平均位移为0.337 m,最大位移为0.384 m;当上部剪力撑焊接完毕而下部剪力撑未焊接时,风荷载作用下桩顶平均位移为0.704 m,最大位移为0.767 m;当上部剪力撑和下部剪力撑焊接完毕后,风荷载作用下桩顶平均位移为0.3447 m,最大位移为0.404 2 m;同一时刻,风荷载作用下,钢管桩位移随着钢管桩高度位置的增大而增大,钢管桩的最大米塞斯应力随着桩项位移的增大而增大,钢管桩最大米塞斯应力位于钢管桩中下部.研究成果对钢管桩剪力撑的施工次序设计具有参考价值.Aiming at the problem of the wind load response caused by the different construction sequences of the upper and lower shear bracings for steel-pipe pile and taking the construction process of the steel-pipe pile for the constniction cat walk for the Yellow River bridge as the study background,the impacts of the wind loads in different construction sequences of the steel-pipe pile are analyzed and studied herein through simulating wind load with the harmonic superposition method for revealing the law of the impact from wind load on the stability of the steel-pipe pile during the construction.The result shows that the effect of wind load can make the steel-pipe pile displaced during the construction.When the lower shear bracing is welded and the upper shear brace is unwelded,the mean displacement of the top of the pile is 0.337 m with the maximum of 0.384 m under the effect of wind load.When the upper shear bracing is welded and the lower shear brace is unwelded under the effect of wind load,the mean displacement of the top of the pile is 0.704 m with the maximum of 0.767 m.When both the upper and lower shear bracings are welded,the mean displacement of the top of the pile is 0.344 7 m with the maximum of 0.404 2 m under the effect of wind load.At the same moment,the displacement of the steel-pipe pile increases along with the increase of the height position of the steelpipe pile,while the maximum Mises stress of the steel-pipe pile increases along with the increase of the displacement of the pile top with the maximum Mises stress at the mid-lower part of the steel-pipe pile.The study result has guiding significance and referential value for the design of the construction sequence of the shear bracing for the steel-pipe pile.

关 键 词：风荷载 施工栈道 钢管桩 剪力撑 桩顶位移 

分 类 号：TU997[建筑科学—市政工程]