Study on Bearing Capacity of the Existing Engineering Pile Group without Lateral Displacement during Dynamic Top-Down Construction

Table 1

Values of α and u for different imperfection amplitudes.

Case imperfection amplitude (mm)			Case 1			Case 2
			35	100	160	35	100	160
Linear		α0		8.439			13.573
		u0		1.486			1.172
Nonlinear	Consistent mode imperfection	(m)		0.17			0.26
		α	7.859	6.864	6.060	12.463	11.297	10.291
		u	1.540	1.648	1.754	1.223	1.284	1.346
		u/u0		1.04∼1.18			1.04∼1.15
	Lateral displacement imperfection	(m)		0.17			0.26
		α	8.283	7.915	7.585	13.150	12.682	12.386
		u	1.500	1.534	1.567	1.190	1.212	1.227
		u/u0		1.01∼1.06			1.02∼1.05