- 摘 要
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(北京工業(yè)大學建筑工程學院， 北京 100124)
［摘要］為提高圓鋼管混凝土的黏結(jié)性能，進行了12個大尺寸圓鋼管混凝土試件的推出試驗。鋼管內(nèi)部構(gòu)造措施包括無構(gòu)造、內(nèi)置豎向肋板、內(nèi)置鋼管和拉結(jié)板、內(nèi)置環(huán)向肋板等6種；采用2種水膠比的核心區(qū)高強混凝土。通過各試件的破壞特征、荷載-滑移曲線和應變，分析了不同構(gòu)造和不同水膠比對圓鋼管混凝土黏結(jié)性能的影響，并得到了環(huán)向肋板抗剪強度的計算方法。研究結(jié)果表明：無構(gòu)造的圓鋼管高強混凝土荷載-滑移曲線存在陡降段，設(shè)置構(gòu)造措施可減弱陡降段；環(huán)向肋構(gòu)造可大幅提高界面黏結(jié)強度和耗能能力，環(huán)向肋豎向肋的組合構(gòu)造對于改善界面黏結(jié)性能效果最好，鋼筋籠對黏結(jié)性能影響不大；混凝土與鋼管的黏結(jié)強度隨混凝土水膠比降低而升高。
［關(guān)鍵詞］鋼管混凝土；黏結(jié)性能；構(gòu)造措施；水膠比；推出試驗
中圖分類號：TU398 文獻標識碼：A文章編號：1002-848X(2021)14-0056-06
Bond behavior of concrete filled circular steel tubes with different constructions
DONG Hongying, CHEN Xuepeng, CAO Wanlin
(College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124， China)
Abstract: In order to improve the bond behavior of concrete filled circular steel tubes (CFCSTs), 12 large-size CFCST specimens were pushed out. The internal structural measures of steel pipes include six types: no constructions, built-in vertical ribs, built-in steel tube and pulling plates, and built-in circular ribs and high-strength concrete was used in the core area with two water-binder ratios. Through the failure characteristics, load-slip curves and strains of the specimens, the influence of different constructions and different water-binder ratios on the bond behavior of CFCSTs was analyzed, and the calculation method of the shear strength of the circular ribs was obtained. The results of the study show that the load-slip curves of CFCSTs with no constructions have steep descent section, which can be weakened by setting constructions; the bond strength and the energy dissipation capacity can be greatly improved by the circular ribs; the combination of vertical ribs and circular ribs has the best effect on improving the interface bond performance; the reinforcement cage has little effect on bond behavior; the interfacial bond strength increases with the decrease of the concrete water-binder ratio.
Keywords:concrete-filled steel tube； bond behavior； constructions； water-binder ratio； push-out test
*國家自然科學基金（51878015）。
作者簡介：董宏英，博士，教授，Email：donghy@bjut.edu.cn；通信作者：曹萬林，博士，教授，Email：wlcao@bjut.edu.cn。
