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在高应变动力试桩时,若锤重心与桩顶没有对中或落锤装置架不竖直,极容易导致偏心敲击,从而对锤体、桩侧的传感器信号产生很大的影响。基于两种不同的传感器安装方法,对高应变试桩时偏心敲击进行仿真研究,详细分析两种高应变测力方式的合理性以及正确的安装方案,重点研究偏心碰撞对各部位速度及应变的影响。通过仿真计算解释实践中出现的诸如偏心严重影响应变、较少影响速度等现象,更正了过去一直认为的大桩需要安装更多传感器才能克服偏心影响等观念。
In the high-strain dynamic test pile, if the center of gravity of the hammer and the top of the pile are not aligned or the vertical rack of the drop hammer is not vertical, it is very easy to cause eccentric tapping, which greatly affects the sensor signals of the hammer and the pile. Based on two different sensor installation methods, the eccentric tapping during high strain test is simulated. The rationality of two kinds of high strain force measurement methods and the correct installation scheme are analyzed in detail. Focusing on the influence of eccentric impact on the velocity and strain Impact. Through the simulation calculation, the phenomena such as serious influence of eccentricity on strain and less influence on speed were explained in practice, and the concept of needing to install more sensors in the past to overcome the eccentric influence was corrected.