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Seismic performance of the shear-deficient exterior RC beam-column joints strengthened with PHSW
Highlights A seismic strengthening method using PHSW was proposed for shear-deficient exterior RC beam-column joints. Reversed cyclic tests were conducted on shear-deficient exterior RC beam-column joints strengthened with PHSW. A formula for calculating the load-bearing capacity of exterior RC beam-column joints strengthened with PHSW was developed.
Abstract This paper presents a study on the seismic performance of shear-deficient exterior reinforced concrete (RC) beam-column joints strengthened with prestressed high-strength steel wire (PHSW). This strengthening technique overcomes the space obstacle of the orthogonal beams and the shortcomings of traditional seismic strengthening techniques for the beam-column joints. To verify the feasibility and effectiveness of the proposed strengthening technique, six large-scale exterior beam-column joints were tested under reversed cyclic loading. The seismic performance of strengthened joint specimens was analysed and compared with that of the original un-strengthened and the code-compliant specimens to investigate the effects of the ratio of PHSW and the prestressing level of wires. The failure mode of the exterior joints had been changed from brittle joint shear mode to ductile beam flexural mode after being properly strengthened, and the load-bearing capacity of the joint specimen can be improved by up to 20%. Other seismic performance parameters of reinforced specimens, such as ductility and energy dissipation capability, were also significantly enhanced with increased PHSW ratio and prestress level. The strengthening scheme is easy to implement, and no anchorage failure occurred during the loading process, indicating that the strengthening technique is feasible, effective, and economical. Based on the test results and theoretical analysis, a formula for calculating the load-bearing capacity of the exterior RC beam-column joint strengthened with PHSW was developed to predict the load-bearing capacity of the strengthened exterior RC beam-column joints.
Seismic performance of the shear-deficient exterior RC beam-column joints strengthened with PHSW
Highlights A seismic strengthening method using PHSW was proposed for shear-deficient exterior RC beam-column joints. Reversed cyclic tests were conducted on shear-deficient exterior RC beam-column joints strengthened with PHSW. A formula for calculating the load-bearing capacity of exterior RC beam-column joints strengthened with PHSW was developed.
Abstract This paper presents a study on the seismic performance of shear-deficient exterior reinforced concrete (RC) beam-column joints strengthened with prestressed high-strength steel wire (PHSW). This strengthening technique overcomes the space obstacle of the orthogonal beams and the shortcomings of traditional seismic strengthening techniques for the beam-column joints. To verify the feasibility and effectiveness of the proposed strengthening technique, six large-scale exterior beam-column joints were tested under reversed cyclic loading. The seismic performance of strengthened joint specimens was analysed and compared with that of the original un-strengthened and the code-compliant specimens to investigate the effects of the ratio of PHSW and the prestressing level of wires. The failure mode of the exterior joints had been changed from brittle joint shear mode to ductile beam flexural mode after being properly strengthened, and the load-bearing capacity of the joint specimen can be improved by up to 20%. Other seismic performance parameters of reinforced specimens, such as ductility and energy dissipation capability, were also significantly enhanced with increased PHSW ratio and prestress level. The strengthening scheme is easy to implement, and no anchorage failure occurred during the loading process, indicating that the strengthening technique is feasible, effective, and economical. Based on the test results and theoretical analysis, a formula for calculating the load-bearing capacity of the exterior RC beam-column joint strengthened with PHSW was developed to predict the load-bearing capacity of the strengthened exterior RC beam-column joints.
Seismic performance of the shear-deficient exterior RC beam-column joints strengthened with PHSW
Huang, Qunxian (author) / Liu, Yang (author) / Tian, Limin (author)
Engineering Structures ; 275
2022-11-12
Article (Journal)
Electronic Resource
English
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