Analysis and Field Measurement on the Internal Force Variation Laws of Steel Pipe Columns in Subway Stations

Table 3

Axial forces increment of steel pipe columns in different construction stages of the pile foundation stations (unit: kN).

Station ID	Station	Axial force increment of the steel pipe columns
		Stage 1	Stage 2	Stage 3	Total	Remark
P1	Youanmen Station	8482	2797	1177	12456	——
P2	Jinrongjie Station	8554	1862	2881	13297	——
P3	Beitaipingzhuang; Station of line 12	8792	2173	—	10465	Stage 3 has not yet begun
P4	Beitaipingzhuang; Station of line 19	—	—	3257	6414	Construction in stages 1 and 2 has been; completed when the measuring points installed
P5	Niujie Station	—	—	1982	1982	Construction in stages 1 and 2 has been; completed when the measuring points installed