填充高强度混凝土箱型钢柱之挠曲韧性行为研究.PDFVIP

填充高強度混凝土箱型鋼柱之撓曲韌性行為研究 Flexural Behavior of High Strength Concrete-Filled Box Columns 主管單位：內政部建築研究所 陳正誠 黃國倫 蔡宜樺 柯人文 Chen, Cheng-Cheng Huang, Guo-Luen Tsai, Yi-Hwa Ko, Jen-Wen 台灣科技大學營建工程系 摘要 本文以寬厚比為32 、40 、48及 60 之填充型箱型鋼柱試體，內填充標稱抗壓 2 強度 840 kgf/cm 之高強度混凝土，在低軸力作用下進行撓曲反覆載重試驗，探 討柱板寬厚比及高強度混凝土對填充型箱型柱撓曲韌性行為之影響。結果顯示低 軸力作用下這些填充型箱型柱試體之實驗彎矩強度皆稍大於理論彎矩強度，塑性 轉角容量皆大於 3% rad ，且大致隨寬厚比減少而增加。本文並進一步將工程界 使用之繫桿作為結構用途來提升其塑性轉角容量，增加 6支寬厚比為 48 及 60 之試體，在塑鉸區使用圍束繫桿，在低軸力作用下進行撓曲反覆載重試驗，並提 出圍束繫桿的簡易設計方法。結果顯示，若使用能對混凝土提供圍束應力達 82 kgf/cm2 以上之圍束繫桿，其塑性轉角容量可與使用耐震構材柱板寬厚比（等於 42 ）之填充型箱型柱相匹配。值得注意的是，高軸力的情況需要另案研究。 關鍵詞：填充型箱型柱、合成柱、鋼骨鋼筋混凝土、柱 Abstract In this paper, 4 specimens of CFBC with b/t of 32, 40, 48, and 60 were experimented under low axial loading and cyclic flexural loading to investigate the flexural behavior. The nominal compressive strength of in-filled concrete is 840 kgf/cm2 . It is observed that plastic rotation angle capacity is larger than 3% rad for these 4 specimens and increases as b/t ratio decreases. Tie rods are equipped for 6 additional specimens with b/t of 48 and 60. A method of estimating confining stress due to tie rods and simple designation method of tie rods are proposed. After use of tie rods, which provide confining stress more than 82 kgf/cm2, the plastic rotation angle capacity of CFBC with b/t of 48 and 60 can be as good as CFBCs with b/t of 40, whose b/t is close to the limitation of SRC code in Taiwan. Keywords: concrete-filled box column, composite column, steel reinforced concrete, column 1 一、前言 填充型箱型柱（concrete filled box column ，或簡稱