斜拉桥拉索安装亮化灯具的风致稳定性研究  

AERODYNAMIC STABILITY OF CABLES WITH LAMPS OF CABLE-STAYED BRIDGE

作　　者：李寿英[1] 陈政清[1] 

机构地区：[1]湖南大学风工程试验研究中心,湖南长沙410082

出　　处：《工程力学》2008年第A01期94-98,共5页Engineering Mechanics

基　　金：国家自然科学基金项目(50708035);中国博士后科学基金项目(20060400873)

摘　　要：斜拉桥拉索上安装亮化灯具可能存在风致稳定性问题。以某斜拉桥拉索亮化灯具安装的初步设计方案为工程背景,制作了几何缩尺比为1∶1的节段模型,并进行了测力和测振风洞试验,试验结果表明:由于设计方案中两条钢丝的存在,该桥拉索灯具安装的初步设计方案可能会使拉索发生经典驰振。然后,提出了一种灯具安装的建议方案:取消钢丝,将电线直接螺旋固定在拉索表面。通过详细的测振试验表明:建议方案不会使拉索产生不稳定的驰振振动。Lamps of cable-stayed bridges are installed on the cables, which might be unstable subjected to wind load. Corresponding to the preliminary installation plan of lamps of a bridge in South China, Specimen of stay cables with lamps were made with the scale of 1 ： 1. Wind tunnel tests for both aerodynamic forces and for galloping were carried out. Results show that the existing of two parallel steel wires in the preliminary installation plan will cause the occurring of galloping. Knowing that, a modified plan is proposed, which throws away the two parallel steel wires. The stability of the proposed installation plan is verified by detailed wind tunnel tests.

关 键 词：斜拉索 驰振 风洞试验 亮化灯具 风致振动 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]