人行索桥合理结构形式研究

为得到适合山区人行索桥的合理结构形式,通过对目前大部分山区人行索桥安全隐患及事故的调查,并对悬索桥和索道桥进行理论计算和对比分析,提出索桁结构概念。索桁桥结构由上主缆、下桥面缆索及吊杆组成,通过在空载下张拉下桥面索形成一个类似桁架结构的空间体系。通过对索桁桥、悬索桥、索道桥3种结构形式的对比分析可知,在山区修建人行索桥采用索桁结构体系是比较合理的,索桁桥可以降低活载挠度,节省工程造价。

Study of Rational Structure Form of Pedestrain Suspension Bridge

To get a rational structure form suited for mountainous pedestrian suspension bridge,according to the investigation into the potential safety hazards and accidents having occurred in a majority of existing mountainous pedestrian suspension bridges and based on the theoretical calculation and comparative analysis of suspension bridge and rope way bridge,the concept of cable-truss structure which consists of upper main cables,lower bridge deck cables and suspenders is proposed,a spatial system similar to truss structure will form via the tensioning of the lower deck cables in unloaded condition.It is found through the comparative analysis of three structural forms of cable-truss bridge,suspension bridge,and rope way bridge that building pedestrian suspension bridge of cable-truss structure system in mountainous region is rational,the deflection under the action of live load in such type of bridge is reduced,and the construction cost is also saved.