台灣水淬鋼筋在耐震結構之應用探討

水淬鋼筋生產成本與售價皆比傳統高強度鋼筋低，台灣水淬鋼筋之市場占有率估計已超過50%，但其在耐震設計之適用性又多受到質疑。本文進行擬SD42水淬鋼筋之化學成份及應力－應變性質之試驗，並根據試驗數據求鋼筋挫屈應變，檢討水淬鋼筋在鋼筋混凝土構材韌性設計之應用。此外進行4之鋼筋混凝土懸臂梁之反復載重試驗，評估擬SD42水淬鋼筋對梁韌性之影響。研究結果發現：（1）水淬鋼筋偏高之實際降伏強度引致較高之梁彎矩與梁剪力，導致梁塑性變型以及消能機制之發展受到限制，其消耗總能量可下降達40%，延展性可下降達19%：（2）水淬鋼筋碳當量變異性大，顯示生產鋼筋之原料品質控制不佳：（3）水淬鋼筋與加釩鋼筋之挫屈應變互有高低，在規範之最低要求層次，擬SD42水淬鋼筋之挫屈潛能不比加釩鋼筋高。

關鍵字

水淬鋼筋；鋼筋；鋼筋混凝土；耐震設計

並列摘要

In this research, controlled-rolling manufactured steel deformed bar specimens were tested to obtain stress-strain relationships and chemical compositions. In addition, four full-scale beam specimens were tested under cyclic loading to investigate the influence of controlled-rolling manufactured steel deformed bars on seismic behavior of beams. It is found that: (1) the beams using controlled-rolling manufactured steel deformed bars as reinforcement resulted in lower ductility and energy dissipation capacity; (2) the variation of carbon equivalent of controlled-rolling manufactured steel deformed bars were high, which indicates that the quality control of law material was poor; (3) the buckling strain of controlled-rolling manufactured steel deformed bars was higher than that of ordinary steel bars at the ratio of hoop spacing to the diameter of steel bar equals 8.