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Effects of grout sleeve defects and their repair on the seismic performance of precast concrete frame structures
Highlights The performance of PC frames having no grout defects and those with defects and repaired defects is described in terms of hysteresis characteristics. The plastic collapse mechanism of PC frames remains unchanged, while the performance is affected by the presence of grout sleeve defects. Despite the defects provided only reducing the capacity of one of three columns either 6% or 19%, the effect on the global behavior of the frame was evident. Injecting grout into defective grout sleeves restored their capacity, and that of the frames, to a defect-free condition.
Abstract Precast concrete frame structures with grouted sleeve connections are widely used. An experimental study was conducted investigating the seismic performance of precast concrete frame structures having backflow defects in their grout sleeves. Repair of such defects is also demonstrated using a simple grout injection technique. Four two-storey precast concrete frame structures having grout sleeve connections in their columns were designed and tested under reversed cyclic loading. The performance of frames having no grout defects and those with defects and repaired defects is described in terms of failure modes, hysteresis characteristics, load-carrying capacity, ductility and energy dissipation capacity. The results indicate that the plastic collapse mechanism of the frames remains unchanged, the performance is affected by the presence of the grout sleeve defects. Despite the defects only reducing the capacity of one of three columns in the frame either 6% or 19%, the effect on the global behavior of the frame was evident in terms of reduced capacity, stiffness, ductility and energy absorption. Injecting grout into defective grout sleeves restored their capacity, and that of the frames, to a defect-free condition.
Effects of grout sleeve defects and their repair on the seismic performance of precast concrete frame structures
Highlights The performance of PC frames having no grout defects and those with defects and repaired defects is described in terms of hysteresis characteristics. The plastic collapse mechanism of PC frames remains unchanged, while the performance is affected by the presence of grout sleeve defects. Despite the defects provided only reducing the capacity of one of three columns either 6% or 19%, the effect on the global behavior of the frame was evident. Injecting grout into defective grout sleeves restored their capacity, and that of the frames, to a defect-free condition.
Abstract Precast concrete frame structures with grouted sleeve connections are widely used. An experimental study was conducted investigating the seismic performance of precast concrete frame structures having backflow defects in their grout sleeves. Repair of such defects is also demonstrated using a simple grout injection technique. Four two-storey precast concrete frame structures having grout sleeve connections in their columns were designed and tested under reversed cyclic loading. The performance of frames having no grout defects and those with defects and repaired defects is described in terms of failure modes, hysteresis characteristics, load-carrying capacity, ductility and energy dissipation capacity. The results indicate that the plastic collapse mechanism of the frames remains unchanged, the performance is affected by the presence of the grout sleeve defects. Despite the defects only reducing the capacity of one of three columns in the frame either 6% or 19%, the effect on the global behavior of the frame was evident in terms of reduced capacity, stiffness, ductility and energy absorption. Injecting grout into defective grout sleeves restored their capacity, and that of the frames, to a defect-free condition.
Effects of grout sleeve defects and their repair on the seismic performance of precast concrete frame structures
Li, Xiangmin (author) / Xiao, Shun (author) / Gao, Rundong (author) / Harries, Kent A. (author) / Wang, Zhuolin (author) / Xu, Qingfeng (author)
Engineering Structures ; 242
2021-05-22
Article (Journal)
Electronic Resource
English
Seismic performance and retrofit of precast concrete grouted sleeve connections
| BASE | 2012