碳纖維筋加固鋼筋混凝土梁基本力學性能的三維非線性分析
畢繼紅1, 2，楊申1，關(guān)健1，王亞龍1
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(1 天津大學建筑工程學院, 天津 300072；2 天津大學濱海土木工程結(jié)構(gòu)與安全教育部重點實驗室, 天津 300072)
［摘要］建立鋼筋與混凝土的分離式有限元模型，對碳纖維筋加固鋼筋混凝土梁與普通鋼筋混凝土梁分別進行數(shù)值模擬分析，并將模擬分析結(jié)果與試驗結(jié)果比較可知，此種數(shù)值模擬方法能夠得到合理的分析結(jié)果。通過數(shù)值模擬討論了增加碳纖維筋直徑和改善碳纖維筋與混凝土之間的粘接情況對梁基本力學性能的影響，結(jié)果表明，增加碳纖維筋直徑能增加梁的承載力，但對其延性有不利影響。改善碳纖維筋與混凝土之間的粘結(jié)性可以有效地提高鋼筋混凝土梁的受力性能，且二者在梁跨中純彎段粘結(jié)性的改善對鋼筋混凝土梁受力性能提高效果尤為顯著。［關(guān)鍵詞］鋼筋混凝土梁; 碳纖維筋; 本構(gòu)關(guān)系; 數(shù)值模擬; 受力性能中圖分類號：TU375.1 文獻標識碼：A 文章編號：1002-848X(2015)16-0101-06
Three-dimensional nonlinear analysis of basic mechanical properties of reinforced concrete beams strengthened by carbon fiber reinforced polymer barsBi Jihong1, 2, Yang Shen1, Guan Jian1, Wang Yalong1(1 School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2 Key Laboratory of Coast Civil Structure Safety, Ministry of Education, Tianjin University, Tianjin 300072, China)Abstract: The discrete finite element modeling of bar and concrete was established. Numerical simulation analyses of reinforced concrete (RC) beam with carbon fiber reinforced polymer(CFRP) bars and common RC beam were carried out. Comparative analyses of numerical simulation results and experimental results were carried out, and the numerical simulation method can obtain a relatively good result. Subsequently, the influence of increasing the diameter of CFRP bars and improving the connectivity between the CFRP bars and concrete on basic mechanical properties of beams was discussed. The results show that increasing the diameter of CFRP bars can enhance the bearing capability of RC beam, however, it results in ductility loss respectively. Improving the connectivity between the CFRP bars and concrete leads a significant improvement of mechanical behavior of RC beam. Especially, improving the connectivity between the CFRP bars and concrete near midspan of beam contributes to improving the mechanical properties of RC beam significantly.Keywords: reinforced concrete beam; carbon fiber reinforced polymer bar; constitutive relation; numerical simulation; mechanical behavior
作者簡介：畢繼紅，博士，教授，博士生導師，Email: jihongbi@163.com。
