Analysis on Load Capacity of Grouted Ducts Connected Precast Piers under Action of Bi-directional Compression and Bending

Abstract

Abstract In order to improve the accuracy of the calculation method of the bearing capacity of the prefabricated pier connected by the grouting bellows, the calculation formula of the ultimate bearing capacity of assembled bridge piers with grouting corrugated pipe connection under the action of bi-directional compression and bending is deduced. Firstly, the quasi-static testing of cast-in-place piers and prefabricated piers under unidirectional and bi-directional loading are introduced, the ultimate bearing capacities are compared. Secondly, according to the arrangement position of the neutral axis and the static force balance relationship, the calculation formulas of the ultimate bearing capacity in two directions under the action of constant axial force are deduced. Finally, the calculation formulas of derivation were verified by the experimental results, and the calculated yield surfaces of the prefabricated piers with grouting corrugated pipe connection under different axial forces are established. The results show that the experimental results are relatively close to the numerical calculation results, the average error does not exceed 10%, and the P-Mx-My three-dimensional yield surface provided a relatively simple and quick method for the cross-sectional safety verification of precast segmental piers with Grouting Corrugated Pipe Connection.