Seismic performance of post-mainshock FRP/steel repaired RC bridge columns subjected to aftershocks

Fakharifar, Mostafa; Chen, Genda; Sneed, Lesley; Dalvand, Ahmad

doi:10.1016/j.compositesb.2014.12.010

Cited by 53 publications

(11 citation statements)

References 42 publications

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“…Recently, the authors have proposed and experimentally validated a hybrid jacket for the repair of severely damaged RC bridge piers (Fakharifar et al 2015b). The hybrid jacket comprised of passive and active confining pressure.…”

Section: Hybrid Repair Jacketmentioning

confidence: 99%

Collapse Vulnerability and Fragility Analysis of Substandard RC Bridges Rehabilitated with Different Repair Jackets Under Post-mainshock Cascading Events

Fakharifar

Chen

Dalvand

et al. 2015

International Journal of Concrete Structures and Materials

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Past earthquakes have signaled the increased collapse vulnerability of mainshock-damaged bridge piers and urgent need of repair interventions prior to subsequent cascading hazard events, such as aftershocks, triggered by the mainshock (MS). The overarching goal of this study is to quantify the collapse vulnerability of mainshock-damaged substandard RC bridge piers rehabilitated with different repair jackets (FRP, conventional thick steel and hybrid jacket) under aftershock (AS) attacks of various intensities. The efficacy of repair jackets on post-MS resilience of repaired bridges is quantified for a prototype two-span singlecolumn bridge bent with lap-splice deficiency at column-footing interface. Extensive number of incremental dynamic time history analyses on numerical finite element bridge models with deteriorating properties under back-to-back MS-AS sequences were utilized to evaluate the efficacy of different repair jackets on the post-repair behavior of RC bridges subjected to AS attacks. Results indicate the dramatic impact of repair jacket application on post-MS resilience of damaged bridge piers-up to 45.5 % increase of structural collapse capacity-subjected to aftershocks of multiple intensities. Besides, the efficacy of repair jackets is found to be proportionate to the intensity of AS attacks. Moreover, the steel jacket exhibited to be the most vulnerable repair intervention compared to CFRP, irrespective of the seismic sequence (severe MS-severe or moderate AS) or earthquake type (nearfault or far-fault).

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Section: Hybrid Repair Jacketmentioning

confidence: 99%

Collapse Vulnerability and Fragility Analysis of Substandard RC Bridges Rehabilitated with Different Repair Jackets Under Post-mainshock Cascading Events

Fakharifar

Chen

Dalvand

et al. 2015

International Journal of Concrete Structures and Materials

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“…The FRP retrofitting technique is less effective for RC columns in near-fault ground motion compared with farfault ground motion because the plastic hinge length in FRP strengthened RC column subjected to near-fault motion is shorter (Fakharifar et al 2015).…”

Section: Frp-strengthened Rc Columnsmentioning

confidence: 99%

A review of FRP strengthened concrete structures under extreme loading

Chen¹,

Xie

Tao

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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Many concrete structures are vulnerable to extreme loadings such as accidental impact, terrorist attack and earthquake disasters. Retrofitting of existing concrete structures for enhanced performance under these loadings has been an important topic of research for a long time, especially since the 911 terrorist attack. Among the different retrofitting techniques, external bonding of fibre reinforced polymer (FRP) composites has been a popular one. This paper presents a brief review of recent research on FRP strengthened concrete structures under blast, impact, earthquake and cyclic loading.

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“…Meanwhile, the lateral deformation capacity of the strengthened columns is also enhanced [34], making the original RC columns in a good three-way stress state [35]. (4) High compressive bearing capacity and good seismic performance [36]. Due to the effective constraint of the round steel pipes on the original RC, the compressive bearing capacity, ductility, and energy dissipation capacity of the members are significantly improved, and the brittle failure of RC columns under high axial compression ratio is effectively improved.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates

Zhou

Wang

et al. 2019

Advances in Civil Engineering

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Based on a practical project, the construction method of circular reinforced concrete (RC) columns strengthened with externally wrapped steel plates was introduced in this paper. In order to study the bearing capacity and seismic performance of circular RC columns after strengthening, a formula for calculating the bearing capacity of circular RC columns strengthened with externally wrapped steel plates was derived, with reference to the Code for Design of Strengthening Concrete Structure. Through ABAQUS software, the vertical monotone static loading analysis and the horizontal low-cyclic reversed loading analysis were carried out, respectively, before and after the strengthening of the full-size RC columns in this project. The results showed that the bearing capacity of the normal section of the RC column after strengthening was about 80% higher than that before strengthening, and the results of FEM software were in accord with the calculation results of theoretical formula to some degree. Under horizontal low-cyclic reversed loading, the columns after strengthening had both plumper hysteresis curves and higher ductility factors and equivalent viscous damping coefficient than those before strengthening, indicating the energy dissipation capacity, plastic deformation capacity, and seismic performance of the RC columns after strengthening were all obviously improved.

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Seismic performance of post-mainshock FRP/steel repaired RC bridge columns subjected to aftershocks

Cited by 53 publications

References 42 publications

Collapse Vulnerability and Fragility Analysis of Substandard RC Bridges Rehabilitated with Different Repair Jackets Under Post-mainshock Cascading Events

Collapse Vulnerability and Fragility Analysis of Substandard RC Bridges Rehabilitated with Different Repair Jackets Under Post-mainshock Cascading Events

A review of FRP strengthened concrete structures under extreme loading

Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates

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