Journal of Jilin University(Engineering and Technology Edition) ›› 2026, Vol. 56 ›› Issue (7): 1926-1936.doi: 10.13229/j.cnki.jdxbgxb.20241381

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Mechanical behavior of hybrid reinforced railway self-centering bridge piers based on ordered sacrificial mechanism

Zheng-nan LIU(),Xing-chong CHEN,Wei-ke ZHANG,Hua-jun MA   

  1. School of Civil Engineering，Lanzhou Jiaotong University，Lanzhou 730070，China
  • Received:2024-12-31 Online:2026-07-01 Published:2026-08-12

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Abstract:

Combining the feature that railway self-centering bridge piers require a pedestal at the pier bottom due to the stringent lateral stiffness demand， a study on the mechanical behavior of railway self-centering bridge piers with an orderly sacrificial mechanism is conducted， in which unbonded energy-dissipating bars are arranged in the pedestal and unbonded prestressing tendons are arranged in the pier body. By discussing the influence of the configuration form of unbonded reinforcements on the seismic performance， a hybrid configuration form of reinforcements to enhance the seismic performance of self-centering piers is proposed. The analysis of the process of change in the mechanical behaviors of reinforcements under the action of lateral cyclic loads is carried out. The factors influencing the hysteresis characteristics of self-centering pier and relationship between the key seismic performance indicators were investigated. The results showed that the high-strength reinforcements are arranged in a single row， the sudden drop in loading capacity caused by reinforcements fracture can lead to the failure of bridge piers. Based on the limited strain variability of reinforcements with different grades， mixing low-grade steel bars（HRB400） with high-strength steel bars（HTRB630） in a staggered arrangement can achieve orderly sacrifice of different grades of reinforcements and the continuous regulation of the compression area of the pedestal， and improve the deformation and bearing capacity of the pier. The reinforcement ratio of prestressing reinforcements affects the post-yield stiffness and lateral strength of self-centering pier. Initial prestressing values， reinforcement ratios， and vertical axial forces affect lateral stiffness. The distance ratio of reinforcements affects the failure of displacement of piers. The three main seismic performance indicators of the self-centering piers have significant positive correlations， i.e.， the load carrying capacity decreases， the energy dissipation capacity and the residual displacement also decrease， whereas the maximum displacement and the residual displacement do not show a positive correlation.

Key words: bridge and tunnel engineering, self-centering bridge pier, hysteresis behavior, seismic performance

CLC Number: 

  • U443.22

Fig.1

Schematic of self-centering railway bridge pier model（cm）"

Fig.2

Configuration of steel"

Fig.3

Numerical analysis model"

Table 1

Table of simulation parameters for energy- consuming and prestressing reinforcement"

钢筋类型材 料参 数数值
HRB400

Reinforcing

Steel

直径/mm8
fy/MPa453.42
fsu/MPa614.7
Es/GPa190.34
Esh/GPa5.6
?sh0.025 26
?su0.144 45×0.7=0.1
HTRB630

Reinforcing

Steel

直径/mm8
fy/MPa738.32
fsu/MPa928.51
Es/GPa219.08
Esh/GPa9.50
?sh0.012 38
?su0.089 65×0.7=0.062 7

预应力

钢筋

ElasticPPE/GPa195
epsP0.009 538
epsN0
eps0-0.00 480 6

Fig.4

Comparison of experiment and simulation results"

Fig.5

Comparison of hysteresis curves"

Fig.6

Comparison of horizontal force and displacement"

Fig.7

Comparison of energy dissipation proportion"

Fig.8

Hysteresis curves of SRP-3"

Fig.9

Hysteresis curves of SRP-4"

Fig.10

Hysteresis curves of SRP-5"

Fig.11

Stages of hysteresis curve"

Fig.12

Stress-strain curves of steel"

Fig.13

Decompression phase of rocking interface"

Fig.14

Decompression phase of steel"

Fig.15

Stress of remaining steels at the first yield of each row of steels"

Fig.16

Lift-off spring pressure"

Fig.17

Simulation results comparison of hysteresis performance parameter"

Fig.18

Change pattern of seismic performance indicators"

Fig.19

Percentage of energy-consuming capacity"

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