Capacity Analysis of Precast Piles Connection with Cast in Situ Pillars

Abstract

The dominant axial force on reinforced concrete bridge columns may affect the ability of pillars to respond to various lateral excitations. This study aimed to analyze the strength of concrete, tensile behavior, and shear strength in the pillar structure of a bridge. The method used to identify the behavior of pillars is to separately analyze the internal capacity of the pillars according to the characteristics of concrete and steel quality, cross-sectional shape, and the configuration of the reinforcement installed in three sections along the pillar height. By checking the adequacy of the lap joints and the length of reinforcement distribution, we assume that the dominant pillar is in tension or compression. We also assume that the dominance of tension in the reinforcement joints is in anticipation of a tensile response in the reinforcement joints when bending behavior is dominant (for tall pillars). Curvature: Analyzing the relationship of force–lateral displacement by simulating the height of the pillars from 1 to 5 m and comparing it with the shear capacity of the pillars so that a confining reinforcement spacing of 50 mm is obtained both on the precast pile and the additional cast in situ pier has been increasing the compressive strength and strain of the pillars so that with a factored axial compressive force of 730 kN, it produces compressive stress at the effective cross-section of the pillar of 13 MPa, which means that the strength of the concrete on the pillars is still sufficient. The shear capacity of the pillar obtained by factored loading is from 17 to 86 kN, so the pillar is still safe from shear failure along its height.

Keywords: bridge, capacity, connection, precast pillar.

https://doi.org/10.55463/issn.1674-2974.50.12.12