中马友谊大桥主桥墩钢护筒压力实测数据分析

Field pressure data in steel casing of main pier in China-Maldives Bridge

大直径钢护筒是外海桥梁设计施工中广泛应用的一种桩基础结构形式,其在波浪作用下的受力问题是海洋工程领域研究的热点问题之一。目前已有的研究成果大多基于数值计算和模型试验,现场监测方面的研究成果较少。文章依托"一带一路"标志性工程项目——中马友谊大桥,在主桥20号墩大直径钢护筒上布置了多组压力传感器,对其所受环境荷载进行了现场监测工作。采用快速傅里叶变换和滤波方法处理实测数据,分离不同频率成分,明确了潮汐的影响周期,得到了波浪引起的压强分量,波浪压强的最大值约为4 k Pa,相关的结论对于设计临时结构物有重要参考意义。

Large-diameter steel casing is widely used as pile-foundation during design and construction of open sea bridges,and its wave force problem is one of hot issues in ocean engineering.Most of the existing results are based on numerical simulations and model tests,however results on in-situ monitoring are fewer.Relying on"One Belt One Road"landmark project China-Maldives Bridge,we installed multiple sets of pressure sensors on No.20pier column of main bridge,and carried out field monitoring of environmental loads.The methods of Fast Fourier Transform and filtering are adopted to analyze measured data,separate the different frequency components,convince the period of tide and extract wave pressure which the maximum wave pressure is about4kPa.The according conclusion is of great significance for the design of temporary structures.