TY - JOUR
T1 - Flexural behavior of bonded post-tensioned concrete beams under strand corrosion
AU - Zhang, Xuhui
AU - Wang, Lei
AU - Zhang, Jianren
AU - Ma, Yafei
AU - Liu, Yongming
N1 - Funding Information:
This work reported here was conducted with the financial supports from National Basic Research Program of China (973 Program) (Grant No. 2015CB057705), National Natural Science Foundation of China (Grant No. 51678069), Hunan Provincial Natural Science Foundation of China (Grant No. 14JJ1022), and Industry Key Laboratory of Traffic Infrastructure Security Risk Management (CSUST, Grant No. 16KE02). The supports are gratefully acknowledged.
PY - 2017/3/1
Y1 - 2017/3/1
N2 - An experimental test is performed to investigate the flexural behavior of bonded post-tensioned concrete beams under strand corrosion. Eight beams are designed and subjected to accelerated method to different corrosion levels. The initial stiffness of beams is observed by cyclic loading-unloading test during the corrosion procedure. Corrosion effects on concrete cracking, post-cracking stiffness, ultimate strength, failure mode and ductility are then clarified by the flexural test. And, a coefficient is introduced to quantify the incompatible strain between corroded strand and concrete. Results show that the prestress force loss of strand has almost the linear relation with corrosion loss. Strand corrosion affects slightly the initial stiffness of beam before flexural cracking, but degrades significantly the post-cracking stiffness of beam as the corrosion loss exceeds 27.0%. Slight corrosion of strand has little effects on beams flexural behavior. The severe corrosion, however, decreases the number of crack, changes the failure mode form the concrete crushing to strand rupture, degrades the ductility and the ultimate strength of beams, and leads to the incompatible strain between strand and concrete. In the present test, the incompatible strain decreases about 20% of the flexural strength as the corrosion loss exceeds 27.0%.
AB - An experimental test is performed to investigate the flexural behavior of bonded post-tensioned concrete beams under strand corrosion. Eight beams are designed and subjected to accelerated method to different corrosion levels. The initial stiffness of beams is observed by cyclic loading-unloading test during the corrosion procedure. Corrosion effects on concrete cracking, post-cracking stiffness, ultimate strength, failure mode and ductility are then clarified by the flexural test. And, a coefficient is introduced to quantify the incompatible strain between corroded strand and concrete. Results show that the prestress force loss of strand has almost the linear relation with corrosion loss. Strand corrosion affects slightly the initial stiffness of beam before flexural cracking, but degrades significantly the post-cracking stiffness of beam as the corrosion loss exceeds 27.0%. Slight corrosion of strand has little effects on beams flexural behavior. The severe corrosion, however, decreases the number of crack, changes the failure mode form the concrete crushing to strand rupture, degrades the ductility and the ultimate strength of beams, and leads to the incompatible strain between strand and concrete. In the present test, the incompatible strain decreases about 20% of the flexural strength as the corrosion loss exceeds 27.0%.
KW - Bonded
KW - Flexural behavior
KW - Post-tensioned
KW - Prestressed concrete beam
KW - Strand corrosion
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U2 - 10.1016/j.nucengdes.2017.01.004
DO - 10.1016/j.nucengdes.2017.01.004
M3 - Article
AN - SCOPUS:85008627169
SN - 0029-5493
VL - 313
SP - 414
EP - 424
JO - Nuclear Engineering and Design
JF - Nuclear Engineering and Design
ER -