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Structural performance of corroded precast concrete tunnel lining
Highlights The 8°/73° joints and 180° section are the structural weakness of the corroded PCTL. The unloaded PCTL has much lower deformability and load-carrying capacity. The structural performance of overloaded PCTL is weakened much more by corrosion. The corrosion of intrados side rebars or bolts of PCTL should be strictly limited.
Abstract Based on the material constitutive models obtained according to the static load test and the finite element simulation conducted by LS-DYNA, the structural performances of the precast concrete tunnel lining (PCTL) of Shanghai Metro under different loading and corrosion cases were analyzed. The results indicated that weakened stiffnesses of the corroded 8° joint, 73° joint, and 180° section led to the redistribution of the internal force, which in turn degraded the structural performance of PCTL. The deformability and unload-carrying capacity of the unloaded PCTL without corrosion were 60% and 30% of those of the overloaded PCTL, respectively, which meant that unloaded PCTL is more vulnerable. PCTL with corroded intrados side rebars and bolts is common in practice. Under this corrosion type, with the increase in corrosion degree (within 0.3), the deformability of PCTL had a maximum decrease of 55.8% (overloaded), and the load-carrying capacity of PCTL had the maximum decrease of 52.1% (overloaded) and 35.7% (unloaded). The corrosion of the intrados steel bars of the bottom segment and bolts of the 73° joint was the most unfavorable condition for the structural performance of PCTL. Regardless of overloaded or unloaded, the corroded PCTL is in a high-risk state. In this study, the water and soil load and the nonuniform space distribution of corrosion were not comprehensively considered, and the constitutive model of the corrosion-expanded concrete was not accurate enough, which needs to be improved in the future.
Structural performance of corroded precast concrete tunnel lining
Highlights The 8°/73° joints and 180° section are the structural weakness of the corroded PCTL. The unloaded PCTL has much lower deformability and load-carrying capacity. The structural performance of overloaded PCTL is weakened much more by corrosion. The corrosion of intrados side rebars or bolts of PCTL should be strictly limited.
Abstract Based on the material constitutive models obtained according to the static load test and the finite element simulation conducted by LS-DYNA, the structural performances of the precast concrete tunnel lining (PCTL) of Shanghai Metro under different loading and corrosion cases were analyzed. The results indicated that weakened stiffnesses of the corroded 8° joint, 73° joint, and 180° section led to the redistribution of the internal force, which in turn degraded the structural performance of PCTL. The deformability and unload-carrying capacity of the unloaded PCTL without corrosion were 60% and 30% of those of the overloaded PCTL, respectively, which meant that unloaded PCTL is more vulnerable. PCTL with corroded intrados side rebars and bolts is common in practice. Under this corrosion type, with the increase in corrosion degree (within 0.3), the deformability of PCTL had a maximum decrease of 55.8% (overloaded), and the load-carrying capacity of PCTL had the maximum decrease of 52.1% (overloaded) and 35.7% (unloaded). The corrosion of the intrados steel bars of the bottom segment and bolts of the 73° joint was the most unfavorable condition for the structural performance of PCTL. Regardless of overloaded or unloaded, the corroded PCTL is in a high-risk state. In this study, the water and soil load and the nonuniform space distribution of corrosion were not comprehensively considered, and the constitutive model of the corrosion-expanded concrete was not accurate enough, which needs to be improved in the future.
Structural performance of corroded precast concrete tunnel lining
Zhang, Weiping (author) / Qiu, Junli (author) / Zhao, Chunlei (author) / Liu, Xian (author) / Huang, Qinghua (author)
2022-07-15
Article (Journal)
Electronic Resource
English
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