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

Table 2

Comparison of the bearing capacity with the compression buckling effect.

Case diameter of the pile body (mm)			Hinged pile top
			600	700	900
Present solution	Linear effective length coefficient	u	1.486	1.577	1.769
	Nonlinear effective length coefficient	uc = βu	1.783	1.892	2.123
	Nonlinear effective length (m)	lc1 = βul0	8.915	9.460	10.615
	Compression buckling coefficient	φ1	0.836	0.882	0.924
	Stability capacity with compression buckling (kN)	Nu1	2530	3640	6304
Code solution	Effective length with compression buckling (m)	lc = 0.7(l0 + 4/α)	11.142	11.971	13.497
	Compression buckling coefficient	φ	0.661	0.748	0.830
	Stability capacity with compression buckling (kN)	Nu	2004	3087	5663
		Nu1/Nu	1.26	1.18	1.11