Study On Mechanical Properties Of Prefabricated High Strength Concrete Filled Steel Tubular Piles Based On Standard Compilation

SC pipe pile is a new type of concrete filled steel tubular composite member,which is produced by pumping high-strength concrete into steel tube and centrifugal technology.However,in practical engineering,the application of SC pipe pile in practical engineering is seriously restricted because there is no standard for selection and application of SC pipe pile.In order to popularize the application of SC pipe piles in production and engineering and strengthen the standardized production and construction of prefabricated pipe piles,this paper uses ABAQUS finite element analysis software to conduct axial compression tests on circular hollow concrete filled steel tubular short columns based on Wang Hongwei and Xu Guolin,simulates the bearing capacity of SC pipe piles under axial compression,and establishes 25 models of SC pipe piles under axial compression.29 SC pipe pile models were established by simulating the stability bearing capacity of SC pipe piles under axial compression according to Wang Hongwei and Zhong Shantong’s tests of circular hollow concrete filled steel tubular long columns.According to Ye Fang et al.,the flexural bearing capacity of SC pipe piles was tested,the flexural performance of SC pipe piles was simulated,and 11 SC pipe pile flexural models were established.According to Tang Qingsen et al.,the shear performance of SC pipe piles was tested,and the shear performance of SC pipe piles was simulated,and 16 SC pipe pile shear models were established.The bearing capacity and deformation capacity of each model are compared with the experimental values to verify the correctness of the finite element model.In this paper,the design method of orthogonal test is used to carry out finite element analysis of the axial compression,bending and shear properties performance of SC pipe piles under different factors and levels,and the influence of various factors on the performance of members is discussed.Comparing the results of FEM calculation with those of superposition theory and unified theory in existing codes,some suggestions for theoretical analysis methods suitable for this Standard are put forward.The results show that the ultimate bearing capacity of tubular pile increases by about 23% for every 20 mm increase of concrete wall thickness,19% for every 1 mm increase of concrete wall thickness,and there is no obvious linear positive correlation with concrete strength.In engineering,superposition theory is used to calculate,which is more safety.When the wall thickness of steel tube increases by 1 mm,its stability bearing capacity under axial compression increases by about 17%,and when the hollow ratio increases by 0.08,the bearing capacity decreases by about 9%,in the small slenderness ratio range,there is a linear negative correlation with the slenderness of pipe piles..In engineering,the unified theory is chosen to calculate,which is more safety.The ultimate flexural capacity of steel tube increases by about 59% for every 100 mm increase in its outer diameter,which is approximately linearly and positively correlated with steel strength,but not with concrete strength.In engineering,superposition theory is used to calculate,which is more safety.The ultimate shear capacity of steel tube increases by 19% for every 100 mm increase in outer diameter,10% for every 20 mm increase in concrete wall thickness,14% for every 1 mm increase in steel tube wall thickness,and decreases with the increase of shear span ratio.In engineering,superposition theory is used to calculate,which is more safety.