The drivability study of piling requires modeling of the hammer impact to calculate the input force wave at the pile head. 摘要桩的可打性研究需要模拟桩的锤击，计算出桩顶的应力波。
He would hammer a nail into the wood with a series of blows that continued to down long after the head was flush with the boards. 他老是连续不断地锤击，把钉子敲进木头，而且钉头与板面平齐之后，还是一个劲儿地敲。
