Seismic damage assessment of hybrid tenon-mortise-in-situ UHPC connection piers

Abstract

Based on the proposed static test carried out on one whole cast-in-place pier specimen and three assembled pier specimens with different connection modes, the damage process of the four specimens under horizontal reciprocating load is analyzed and their damage conditions are evaluated by using the damage classification methods and different damage models commonly used at home and abroad, and the damage modes of the three assembled piers differ to different extents from that of the whole cast-in-place specimen. Compared with the whole cast-in-situ specimen, the damage modes of the three assembled piers have different degrees of difference, and the damage value of the specimen with splice joints located in the pier body is smaller than that of the other assembled piers under the same displacement amplitude; parameter expansion analysis is carried out on the UT-2 specimen to study the effect of different parameter changes on the damage performance under the proposed static cyclic loading. The results show that the larger the axial pressure ratio is, the larger the damage is. The larger the length to slenderness ratio, the smaller the damage. When the hoop ratio is from 0 % to 0.262 %, the damage value changes obviously. When the longitudinal reinforcement ratio is between 0.7 % and 1.94 %, the abutment damage decreases with the increase of longitudinal reinforcement ratio. The ratio of the cam width to the abutment section length is suggested to be 0.49–0.69. The related research can provide reference for the engineering design and seismic damage assessment of assembled RC abutments.