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(1 南京工程學(xué)院經(jīng)濟與管理學(xué)院， 南京 211167； 2 南京航空航天大學(xué)金城學(xué)院， 南京 211156）
［摘要］為探討ECC在結(jié)構(gòu)新建、加固等領(lǐng)域的應(yīng)用，開展鋼筋增強混凝土-ECC組合梁的抗彎性能全過程理論研究，分析組合梁在彈性階段、帶裂縫工作階段、破壞階段的破壞現(xiàn)象，結(jié)合平截面假定和本構(gòu)關(guān)系分析各階段截面的應(yīng)力-應(yīng)變關(guān)系，依據(jù)力和力矩平衡原則建立抗彎承載力計算公式，通過組合梁和RC梁的抗彎試驗驗證理論的正確性，進(jìn)一步理論分析不同ECC厚度對組合梁的抗彎承載力和延性性能的影響。研究表明：與RC梁相比，用ECC替代部分受拉區(qū)混凝土承載力可提高60%以上，位移延性可提高46%以上；ECC厚度在19%～38%梁高范圍內(nèi)可獲得較為優(yōu)越的抗彎承載力和延性；為發(fā)揮ECC材料的高延性應(yīng)將其與高強混凝土和高強鋼筋結(jié)合使用，并著眼于提高構(gòu)件的阻裂、限裂、增韌等性能。
［關(guān)鍵詞］全過程抗彎性能； 抗彎承載能力； 延性； ECC厚度
中圖分類號：TU375-2文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)14-0056-06
Theoretical and experimental study on flexural behavior of steel reinforced concrete-ECC composite beams
Hu Shixiang1, Luo Min2, Li Yale2, Chen Peng2, Xu Bailin2
（1 School of Economics ＆ Management, Nanjing Institute of Technology, Nanjing 211167, China；2 Jincheng College, Nanjin University of Aeronautics and Astronautics, Nanjing 211156, China）
Abstract:In order to discuss the application of ECC in the field of new construction and reinforcement of structures, the whole process theoretical study of flexural behavior of steel reinforced concrete-ECC composite beams was carried out. The failure phenomena of composite beams in the elastic stage, the working stage with cracks and the failure stage were analyzed. The stress-strain relationship of sections in each stage was analyzed based on the assumption of plane section and the constitutive relationship, and the flexural resistance was established according to the principle of force and moment balance. The correctness of the theory was verified by the flexural tests of composite beams and RC beams, and the effect of different ECC thickness on the flexural capacity and ductility of composite beams was further analyzed theoretically. The results show that, compared with RC beams, the bearing capacity of beams with ECC in partial tension zone can be increased by more than 60% and the displacement ductility can be increased by more than 46%. When the ECC thickness ranges from 19% to 38% of beam height, the beams can obtain better flexural bearing capacity and ductility. In order to give full play to the high ductility of ECC materials, ECC should be combined with high strength concrete and high strength steel bars, and focus on improving the crack resistance, crack limitation and ductility behaviors of members.
Keywords:whole process flexural behavior; flexural capacity; ductility; ECC thickness
*南京工程學(xué)院校級科研基金（YKJ201724），江蘇省高校自然科學(xué)研究面上項目（17KJB560006）。
作者簡介：胡世翔，博士，講師，Email:hqhsx@163.com。
