空间缆索体系悬索桥动力特性分析

Dynamic Performance Analysis of Suspension Bridge With Spetial Cable

以凤凰山古城里悬索桥为工程背景,介绍了采用Midas/Civil软件进行悬索桥建模的过程。并以横向矢跨比为参数,建立了7个模型来对比分析不同横向矢跨比对悬索桥空间特性的影响。结果表明,随着横向矢跨比的增大,在一定范围内主梁的横弯和扭转频率均在变大,即横向及扭转刚度都在增强;而当横向矢跨比大于1/100时,缆索的空间特性几乎不存在;此外,具有空间缆索的悬索桥横向刚度较传统平面缆索的大。

Taking the suspension bridge in Lantau Peak city as the engineering background,this paper introduces the process of modeling the suspension bridge with Midas/Civil software.And the 7 models are established to compare the spatial characteristics of suspension bridges by using different transverse span ratio.The results shows that with the increment of the horizontal rise span ratio,the beam transverse bending and torsion frequencies are increase in a certain range,which means both horizontal and torsional stiffness are enhanced.And when the transverse span ratio is larger than 1/100,the spatial characteristics of the cable is almost non-existent.In addition,a spatial cable suspension bridge lateral stiffness are larger than those of the traditional plane cable.