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对波浪作用下东海大桥附近海上风电场钢管桩基础在连接平台前后的动态反应进行了原位测试。通过放置在桩顶的加速度传感器测得桩顶的加速度时程曲线,将加速度时程曲线进行2次积分得到桩顶的位移时程曲线。对比实测结果,涨潮期间所测得的桩顶位移大于平潮期;钢管桩与平台连接后,在波浪作用下的位移小于连接前。运用Morison方程计算出桩身的所受的波浪力,并采用m法对桩身的变形进行计算,对比现场实测值,计算所得结果小于测试结果。
The dynamic response of the steel pipe pile foundation of the offshore wind farm near the East China Sea Bridge before and after the connection platform under wave action was tested in situ. The acceleration curve of the top of the pile is measured by the acceleration sensor placed on the top of the pile. The curve of the displacement top of the pile top is obtained by integrating the acceleration time history curve twice. Compared with measured results, the displacement of pile top measured during high tide is larger than that of flat tide period. After steel pipe pile and platform are connected, the displacement under wave action is smaller than that before connection. Morison equation is used to calculate the wave force of the pile body, and the deformation of the pile body is calculated by m method. Compared with the actual measured value, the calculated result is less than the test result.