深水桥梁浮式基础系泊体系研究  

Mooring System of Floating Foundation in Deep-water Bridges

作　　者：向升 冷欣泽 程斌[1,2] XIANG Sheng;LENG Xin-ze;CHENG Bin(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;School of Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学海洋工程全国重点实验室,上海200240 [2]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《中国公路学报》2025年第2期14-22,共9页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(52278192,52208180);中国博士后科学基金项目(2023M742288)。

摘　　要：浮式桥梁在深水软弱地基水域具有良好的应用前景,其浮式基础动力特性受下部系泊体系影响显著,目前相关研究较为有限。针对斜向索系泊、张力腿系泊、组合式系泊3种体系浮式基础开展了1∶70水动力缩尺模型试验,结合结构固有频率、幅值响应算子和功率谱密度曲线对各体系浮式基础的动力特性进行了研究和对比,明确了不同系泊体系的适用波浪环境。进一步基于水动力数值模拟对组合式系泊体系开展了考虑不同斜向索-张力腿刚度比和整体系泊刚度的参数分析,得到了系泊索刚度设置对此类浮式基础的影响规律。研究结果表明:斜向索系泊体系具有较宽的高响应频带,各自由度运动耦合关系明显,仅适用于低浪高水域;张力腿系泊体系的低频水平运动显著,相同不规则波作用下的水平运动响应可达其他2类体系的2.3倍,不适用于存在低频涌浪的水域;组合式系泊体系的水平运动幅值响应算子峰值较大,但高响应出现在较窄频带内,通过调节系泊索刚度使结构水平共振频率远离波浪谱峰频率,可有效降低结构动力响应,此类体系的适用范围较广。研究可为深水桥梁浮式基础的后续研究与应用提供参考借鉴。Floating bridges have good application prospects in deep-water areas with weak soil foundations,and the dynamic characteristics of their floating foundations are significantly influenced by the mooring system.A 1∶70 scaled hydrodynamic model test was conducted for three types of floating foundations:inclined cables,tension legs,and combination systems.The dynamic characteristics of different floating foundations were investigated and compared based on the natural frequency,amplitude response operator(RAO),and power spectral density,and the applicable wave environments of the mooring systems were specified.Based on a hydrodynamic numerical simulation,a parametric analysis of the combination mooring system was conducted,considering different inclined cable-to-tension leg stiffness ratios and the overall mooring stiffness.Furthermore,the influence of the mooring stiffness setting on this type of floating foundation was analyzed.The results showed that the inclined system had a broad frequency range of high response,and the motion coupling of each degree of freedom was significant,suitable only for weak-wave areas.For the tension leg system,the low-frequency horizontal motion was significant,which could reach 2.3 times of those of the other two types of systems under the same irregular wave.This type of system is unsuitable for water with low-frequency swells.The peak RAO of the horizontal displacement for the combined system was significant;however,a high response occurred in a narrow frequency range.By adjusting the cable stiffness,the horizontal resonance frequency could be tuned far from the wave peak frequency,which could effectively reduce the structural dynamic response.This system is suitable for a wide range of applications.This study provides a reference for future research and applications of floating foundations of deep-water bridges.

关 键 词：桥梁工程 浮式基础 模型试验 系泊系统 水动力响应 

分 类 号：U44[建筑科学—桥梁与隧道工程]