›› 2011, Vol. 32 ›› Issue (6): 1736-1740.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Test study and numerical analysis of stability of high-level cap steel tubular pile under compression loads

JIA Qiang, ZHENG Ai-ping, ZHANG Xin   

  1. Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building Structures, Shandong Jianzhu University, Jinan 250013, China
  • Received:2010-04-22 Online:2011-06-10 Published:2011-06-21

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Abstract: Steel tubular pile underpinning technology is an effective method to develop underground space in retrofitting of existing buildings. The bottom of steel tubular pile inserted into concrete pile while top connected with underpinning cap. The stability of the pile under compression load decreased after the soil around the pile dug, but the stability coefficient and length factor of steel tubular pile can not be obtained by currently code. According to the 1:2 model test and nonlinear buckling analysis respectively, the stress distribution and the ultimate bearing capacity of the pile is derived. The effective length factor for stability calculation is 0.616 gotten by test study; and the numerical result is 0.683. So the pile is restricted with base edge fixed and top edge articulated. More safety stability of the pile can be obtained by buckling numerical analysis which can provide reference for pile design.

Key words: steel tubular pile, effective length factor, buckling analysis, underpinning

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