某钢板带景观人行桥抗风性能研究

Study on Wind-Resistance Performance of A Steel Ribbon Landscape Pedestrian Bridge

深圳华侨城光明小镇项目中的光明绿道景观悬桥为国内首座钢板带景观人行桥,其建筑外形独特,结构纤细,且当地的设计风速较大,周围山地地貌风场异常复杂,这给悬桥的抗风设计带来了巨大的挑战。为研究悬桥的抗风性能,笔者对桥址周围山地风场进行CFD数值模拟,结果表明:实际风场介于标准B类地貌和标准C类地貌之间;结合当地气象站资料进行风气候分析,并依据CFD数值模拟结果和《公路桥梁抗风设计规范》(JTG/T 3360-01-2018,以下简称《规范》)确定了悬桥结构设计风速,以及颤振临界风速。采用缩尺节段模型试验来验证桥梁断面空气动力稳定性,结果表明:+3至-3不同攻角下,桥梁的颤振临界风速高于设计临界风速,并且其涡激共振幅度在允许范围内。

The Guangming Greenway Landscape Hanging Bridge in Guangming Town Project of Shenzhen OCT is the first steel ribbon landscape pedestrian bridge in China.The bridge has a unique architectural shape and slender structure.In addition,the local design wind speed is high,and the wind field of the surrounding mountainous landforms is extremely complex,which brings huge challenges to the wind resistance design of the suspension bridge.The results show that the actual wind field is between the standard B-type landform and the standard C-type landform.Combined with the data of the local weather station,the wind climate was analyzed,and the design wind speed of the suspension bridge structure and the flutter critical wind speed were determined according to the CFD numerical simulation results and specifications.The reduced-scale segment model test is used to verify the aerodynamic stability of the bridge section.The results show that the critical flutter wind speed of the bridge is higher than the design critical wind speed at different angles of attack from+3 to-3,and its vortex-induced resonance amplitude is within the allowable range.