Research on the Pounding Response and Pounding Effect of a Continuous Rigid-Frame Bridge with Fabricated Super-High Piers Connected by Grouting Sleeves

The dynamic characteristics of a continuous rigid-frame bridge with fabricated super-high piers (CRFB-FSP) connected by grouting sleeves and adjacent beam bridges (AB) are significantly different, they prone to pounding under earthquake excitation. At present, the response between CRFB-FSP AB is still unclear, impact on seismic performance in exploratory stage. In this study, two 1/20 scaled models (MB) cast-in-place were designed manufactured. Then, according research purpose output shaking table, three each non-long-period (NLP) ground motions near-fault pulse-type (NFPT) selected as inputs excitation table test. peak acceleration (PGA) changes from 0.5 g 1.5 g. According similarity ratio (1/20), initial gap MB was taken 7 mm (prototype design: 140 mm). Furthermore, longitudinal CFRB-FSP AB, well its influence CFRB-FSP, systematically investigated through test finite element analysis (FEA). results showed that easily caused persistent pounding, which may increase damage risk pier. force NFPT motion more significant than NLP motion, whereas number smaller. increased gap, stiffness, span, pier height. With without reflected higher-order mode participation (HMP) characteristics. After excitation, HMP contribution compared condition, while effect displacement main height gap. bending moment bottom span however, decreased Moreover, both reduced. contrast, corresponding same conditions.