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Seismic fragility and post-earthquake reparability of concrete encased-and-filled steel tubular bridges columns with debonded high-strength reinforcements

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Abstract

In this study, debonded high-strength rebar (DHSR) is used to reinforce a concrete encased-and-filled steel tubular (CEFST) column, reducing residual deformation through high elastic self-centering (SC). The experimental results confirm that the CEFST column with DHSR has a strong SC capacity. Owing to the simple and low-cost technology, the advantages of the standard CEFST columns, the resilient CEFST column is an ideal option for constructing bridge columns. A bridge archetype with four spans and two-column bents is designed to compare seismic responses and post-earthquake reparability. The steel-bond slip due to debonding is described using the softening of Young’s modulus of DHSR, which is used to simulate the seismic behaviors of the CEFST columns with DHSR. The applicability is verified by comparing the hysteretic behaviors between the experimental and predicted results. An incremental dynamic analysis of bridge archetypes is performed, based on 20 ground motions to accumulate a database for fragility analysis. The results show that the yield and failed lateral drifts of the CEFST bridge column with DHSR are larger than that of other types of CEFST bridge columns. The seismic and fragility analyses of the residual lateral drift results indicate that DHSR can greatly improve seismic safety and post-earthquake reparability. Further refinement of the predictions of the residual lateral drift based on the JRA and FEMA codes is required.

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Abbreviations

b :

Strain-hardening ratio of steel material

C R :

Correction coefficient (= 0.6)

d b :

Diameter of the reinforcing bar

E sm :

Modified Young’s modulus of steel

E s :

Young’s modulus of steel

Etc:

Tension softening stiffness

Ec :

Elastic modulus of concrete

f y :

Yield stress of the reinforcing bar

f pc :

Concrete compressive strength at 28 days

f pcu :

Concrete crushing strength

f t :

Tensile strength of concrete

L :

Shear span length of test column

L emd :

Embedment length of the longitudinal rebar

l pd :

Debonding length of the steel rebar

n :

Selected number of GMs

P [C/ PGA = x]:

Probability that a ground motion with PGA = x will cause the bridge archetype to enter different damage limit states

r :

Ratio of post-yielding stiffness to initial stiffness

R rd :

Residual lateral drift

R y :

Yield lateral drift

R p :

Transient peak lateral drift (defined in Fig. 9)

u :

Bond strength between concrete and the longitudinal rebar

ε e :

Axial strain at the end of the longitudinal rebar

ε y :

Axial yield strain of the reinforcing bar

ε psc0 :

Concrete strain at maximum strength;

ε psU :

Concrete strain at crushing strength;

Φ():

Standard normal cumulative distribution function

β :

Standard deviation of LN PGA

µ r :

Response ductility

μ :

Median of the fragility function (the PGA level with 50% probability of entering the damage limit state)

lambda:

Ratio between unloading slope at epscu and initial slope

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (Project No: 52278194). Furthermore, the financial support provided to the post-doctoral researcher from Shenzhen City was also acknowledged.

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Authors and Affiliations

  1. International Research Organization for Advanced Science and Technology, Kumamoto University, Kumamoto, 8608555, Japan

    J. H. Wang

  2. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, 518000, China

    J. H. Wang

  3. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, Jiangsu Province, China

    D. F. Du & C. Su

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Correspondence to J. H. Wang.

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This study was supported by the National Natural Science Foundation of China (Project No: 52278194). Furthermore, the financial support provided to the post-doctoral researcher from Shenzhen City was also acknowledged.

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Wang, J.H., Du, D.F. & Su, C. Seismic fragility and post-earthquake reparability of concrete encased-and-filled steel tubular bridges columns with debonded high-strength reinforcements. Bull Earthquake Eng 21, 4877–4904 (2023). https://doi.org/10.1007/s10518-023-01727-6

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