Reliability Analysis Of Bearing Capacity Of C105 Concrete Pipe Pile Subjected To Axial Compression

With the implementation of the national policy and the vigorous development of the society,the construction industry is developing in the direction of mechanization,high efficiency,green construction and environmental protection and energy saving.As a prefabricated component,pipe pile has become a primary choice for the development of cast-in-place,and it has a great development prospect in the future of construction.In order to reduce the number of piles,the study of the application of super high strength concrete materials in the pipe pile industry has become the main direction of the future development.Therefore,a large number of experimental and academic discussions have been carried out by the scholars.This paper is a joint development of Jilin Jianhua building materials Co.,Ltd.and Jilin Architecture University,which will be applied to the research of C105 super high strength concrete pipe pile in a project in Jilin Province,and further improve and develop the specifications of super high strength concrete prestressed pipe pile,which can be realized mechanically and efficiently during the construction process.And environmental protection,energy conservation and other goals play a connecting role.Compared with the common concrete prefabricated pipe pile,C105 super high strength prefabricated pipe pile is reflected in resources and funds.Compared with ordinary concrete,it reduces the size of the cap and reduces the number of piles,thus reducing the waste of resources and reducing the cost.There is very little experience in the research and application of super highstrength precast tubular piles.Because of its large number of advantages,it should be popularized in practical projects.However,the failure mode of super high strength concrete under compressive stress is the application of brittle failure in building engineering.And there is no standard to follow in the design.In this study,we use the improved first order two order method in reliability analysis to find out reliable indicators that can meet the requirements of national standards.(1)the probability density function distribution of C105 concrete cube compressive strength(150mm x 150 mm x 150mm)is fitted by test,and the parameters such as standard value,standard deviation,coefficient of variation and mean value are determined.(2)the distribution of the probability density function of the axial compression strength of C105 concrete(150mm x 150 mm x 150mm)is fitted by test,and the parameters such as standard value,standard deviation,coefficient of variation and mean value are determined.(3)determination of conversion coefficient of C105 concrete axial compressive strength(150mm x 150 mm x 300mm)and cubic compressive strength of C105concrete(150mm x 150 mm x 150mm).(4)through the ABAQUS finite element nonlinear analysis of C105 concrete short pile,the effect of stirrups on axial compression bearing capacity is obtained.(5)reliability analysis of C105 concrete short pile is carried out to obtain the bearing capacity that meets the specification requirements.Through the study of the above work,the best reinforcement form of C105 concrete pipe pile,the compressive strength of C105 concrete and the conversion coefficient between them,and the ultimate bearing capacity of the pipe pile are obtained.