悬浮隧道多锚固方案结构综合分析与评价研究

Comprehensive analysis and evaluations study of submerged floating tunnel structure with multiple mooring options

提出一种悬浮隧道锚索方案综合分析与评价方法,通过设置1 km长直线形悬浮隧道6个特征锚索方案,采用几何非线性静力及模态有限元计算各方案在特征荷载作用下管体、锚索、锚点响应及结构动力特性。发现:1)空间布置方案如“倒置索桥”锚索工程量较大;2)高长比1:100管体扭转刚度贡献仍然受控于岸边约束和管体结构;3)缆力变化最大方案,其缆力变化分布通常也最不均,也即缆力纵向不均程度超过其横向的;4)“两竖两斜”和“两撇两捺”锚索横向布置方案性价比较高,当不需控制管体水平位移时,“两竖”布置方案性价比最高。

In this paper,we proposed a method for comprehensive analysis and evaluations for mooring options of submerged floating tunnel(SFT).By drawing a 1 km long straight aligned SFT with 6 different mooring options,using non-linear geometry structural static analysis and modal analysis to derive SFT's response of tube,cables,anchoring point as well as structural dynamic characteristic parameters.Finds are:1)cable quantity of spacious arranged option such as"inversed cable-stayed bridges"is large;2)the rotational stiffness of SFT tube with a height-length ratio of 1:100 is governed by the full constraint shore connections and the tube structure itself;3)the option that results in the maximum cable force has the most nonuniformity of cable-force,that is to say,the longitudinal unevenness of the cable force exceeds that of the transverse force;4)the transverse arranged"two vertical and two inclined"and the"four inclined"options demonstrates higher cost-efficiency,in case SFT's transverse motion requires no constraint,the"two vertical"option yields the highest cost-efficiency.