The Experimental And Numerical Analysis Of Shear Performance Of Concrete Pipe Pile

Concrete pipe pile with its own advantages has been more widely used in theconstruction of infrastructure projects, favored by a majority of designers, andmore and more people devote to the study of it, under the situation of thenational economy keeps continuing to improve and the domestic constructionindustry is in great development environment. In the previous research, peopletake more attention to pipe pile as a kind of compression member, and moreconsideration to the vertical bearing capacity of concrete pipe pile but ignore thehorizontal bearing capacity. Shear performance of concrete pipe pile is animportant bearing indicator especially when it is subjected to earthquake orutilized as a supporting pile. However, in the actual project, because of thecurrent analysis of shear capacity of concrete pipe pile has still not reached tothe profound and thorough point, a lot of engineering quality accidents havehappened. The main reason which caused it is the security reserve about shearcapacity of pipe pile is inadequate. Therefore, it deeply prompts us to morein-depth study of shear performance of concrete pipe pile.Based on a large number of research results of domestic and foreign scholarsabout shear performance of concrete pipe pile, around the research on improving the ultimate shear capacity of concrete pipe pile, and combined the indoor sheartest of ordinary pipe pile and reinforced pipe pile which are on-site productionwith the numerical analysis, this thesis emphasized that concrete pipe pile’sshearing performance is influenced by the stirrup ratio and the stirrup type, theshear-span ratio, the longitudinal reinforcement ratio. The main conclusions areas follows:(1)Based on the two different forms of pipe pile under the twoconcentrated and symmetrical loading, we have the two piles of failure modes.According to the failure modes is concluded: To equip with spiral stirrup on thebasis of the round hoop can effectively control the development of cracks inshear-span area.(2)The first crack in the form of piles is not influenced by longitudinalreinforcement ratio, shear-span ratio, stirrup ratio and stirrup types.(3)The first cracking shear of piles is nearly not influenced by longitudinalreinforcement ration, stirrup ratio and stirrup types except shear-span ratio. Theresults indicate that with an increase of shear-span ratio, the first cracking shearof piles decreased correspondingly.(4)With an increase of stirrup ratio, the ultimate shear capacity of pilesincreased correspondingly. With an increase of shear-span ratio, the ultimateshear capacity of piles decreased correspondingly. With an increase oflongitudinal reinforcement ratio, the ultimate shear capacity of piles increasedslightly and correspondingly. (5)When piles are equipped with spiral stirrup to improve shearperformance, the form of stirrups should be reasonably optimized, so that moreof the spiral hoop limb would be orthogonal with the direction of diagonalcracks appeared in the middle position of shear-span area.