塔吊对施工期超高桥塔抖振响应影响的风洞试验研究  

Wind Tunnel Tests on Influence of Tower Cranes on Buffeting Response of Ultra⁃high Pylon During Construction

作　　者：龚旭焘 种爱秀 李永乐[1,3] 向活跃 康学云[2] GONG Xutao;ZHONG Aixiu;LI Yongle;XIANG Huoyue;KANG Xueyun(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;CCCC Second Harbor Engineering Co.Ltd.,Wuhan 430040,China;Key Laboratory of Wind Engineering of Sichuan Province,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]中交第二航务工程局有限公司,武汉430040 [3]风工程四川省重点实验室,成都610031

出　　处：《铁道建筑》2023年第5期57-61,共5页Railway Engineering

基　　金：国家自然科学基金(51978589)。

摘　　要：一座大跨度斜拉桥桥塔为空间钻石形塔,由于桥塔较高,塔吊尺寸相对较大。为研究塔吊对桥塔施工阶段自立状态抖振响应的影响,通过钢-混混合桥塔与塔吊组成的联合体系以及自立状态下的裸塔体系气弹模型风洞试验,得到了不同施工阶段两种桥塔体系在不同风速和风偏角下的抖振响应,讨论了抖振响应随风速与风偏角的变化规律,分析了不同施工阶段下塔吊及其布置形式对桥塔响应的影响。结果表明:桥塔抖振位移均方差随风速增大而增大。在桥塔封顶阶段不同风偏角下,脉动风作用时自立状态裸塔体系的横风向抖振位移响应比顺风向更大,有塔吊时桥塔抖振位移均方差有所减小,横桥向尤为明显。四肢合龙前阶段,桥塔周围布置的塔吊对桥塔的抖振位移响应影响相对较小,横桥向或顺桥向布置多台塔吊比仅布置一台塔吊时的桥塔抖振位移响应小。The pylon of a long-span cable-stayed bridge is a spatial diamond-shaped pylon.Due to the superhigh height of the pylon,tower cranes arranged around it have a larger size.In order to clarify the effects of tower cranes on the buffeting response of the free-standing pylon during construction,wind tunnel tests of aeroelastic model of the joint system composed of steel-concrete hybrid pylon and tower cranes and the bare pylon system in free-standing state were carried out.Buffeting responses under different wind speeds and wind yaw angles of two pylon systems in different construction stages were obtained.The effects of wind speed and wind yaw angle on buffeting responses of two pylon systems were discussed,and the effects of tower cranes and the tower crane layout on responses of the pylon in different construction stages were analyzed.The results show that the standard deviation of buffeting displacement of the pylon increases with the increase of wind speed.Under different wind yaw angles at the capping stage of pylon,the buffeting displacement in transverse direction of the bare pylon system in free-standing state under pulsating wind is larger than that in longitudinal direction,and the existence of tower cranes can decrease the standard deviation of buffeting displacement of the pylon,especially in the transverse bridge direction.Before the closure of the four pylon columns,the tower cranes arranged around the pylon have relatively little effect on the buffeting displacement response of the pylon,and compared with the situation that only one tower crane is arranged in the transverse or longitudinal direction of the pylon,the buffeting displacement response of the pylon is smaller when multiple tower cranes are arranged.

关 键 词：斜拉桥 超高桥塔 风洞试验 塔吊 施工阶段 抖振 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U443.38[交通运输工程—道路与铁道工程]