基于位移的FRP加固混凝土框架抗震设计
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摘要
以目标侧向刚度为控制指标,提出了FRP加固钢筋混凝土框架基于位移的抗震加固设计方法。该方法可以针对既有框架柱、梁构件进行准确的FRP抗震加固设计。给出了FRP加固钢筋混凝土构件屈服前、后两阶段的截面刚度计算公式,并对比了计算值与试验值,验证了公式的准确性。建立了屈服前、后两阶段的框架侧向刚度公式。利用目标侧向刚度与结构分析商业软件,可以进行FRP加固钢筋混凝土框架结构的静力弹塑性分析。算例表明,该算法是可行的。
With the target lateral stiffness as a control index,the displacement-based seismic design is introduced for RC frames retrofitted with FRP composite.The proposed method can be exactly used for FRP seismic design aimed at any beam,column and joint.The cross-section stiffness formulas of pre-yield and post-yield were given for RC components retrofitted with FRP composites.The formulas' accuracy is confirmed through a series of tests' results.Based on the component's cross-section stiffness,the frame lateral stiffness formula is determined.The nonlinear static analysis of RC frames retrofitted with FRP composites may be made by target stiffness and commercial software.The example shows that the proposed method is feasible.
With the target lateral stiffness as a control index,the displacement-based seismic design is introduced for RC frames retrofitted with FRP composite.The proposed method can be exactly used for FRP seismic design aimed at any beam,column and joint.The cross-section stiffness formulas of pre-yield and post-yield were given for RC components retrofitted with FRP composites.The formulas' accuracy is confirmed through a series of tests' results.Based on the component's cross-section stiffness,the frame lateral stiffness formula is determined.The nonlinear static analysis of RC frames retrofitted with FRP composites may be made by target stiffness and commercial software.The example shows that the proposed method is feasible.
引文
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[2]韩建平,吕西林,李慧.基于性能的地震工程研究的新进展及对结构非线性分析的要求[J].地震工程与工程振动,2007,27(4):15-23.(in Chinese)HAN Jianping,LU Xilin,LI Hui.State-of-the-art of performance-based earthquake engineering and need for structural nonlinear analysis[J].Journal of Earthquake Engineering and Engineering Vibration,2007,27(4):15-23.(in Chinese)
[3]Lam L,Teng J G.Strength models for fiber-reinforced plastic-confined concrete[J].Journal of Structural Engineering,2002,(128):612-623.
[4]Ozcana O,Binicib B,Ozcebeb G.Seismic strengthening of rectangular reinforced concrete columns using fiber reinforced polymers[J].Engineering Structures,2010,32:964-973.
[5]Colomb F,Tobbi H,Ferrier E,et al.Seismic retrofit of reinforced concrete short columns by CFRP materials[J].Composite Structures,2008,(82):475-487.
[6]Mahini S S,Ronagh Hamid R.Strength and ductility of FRP web-bonded RC beams for the assessment of retrofitted beam-column joints[J].Composite Structures,2010,(92):1325-1332.
[7]Tsonos A G.Effectiveness of CFRP-jackets and RC-jackets in post-earthquake and pre-earthquake retrofitting of beam-column subassemblages[J].Engineering Structures,2008,(30):777-793.
[8]王步,王溥.碳纤维布加固混凝土梁柱节点抗震性能试验研究[J].建筑结构,2006,12(36):60-64.WANG Bu,WANG Pu.Experimental study on seismic behavior of RC beam-column joints upgraded by CFRP sheets[J].Building Structure,2006,12(36):60-64.(in Chinese)
[9]Priestley M J N,Kowalsky M J.Direct displacement-based seismic deign of concrete buildings[J].Bulletin,NZSEE,2000,33(4):421-444.
[10]盛国华,朱浮声,徐明磊.基于性能的FRP加固混凝土柱抗震水平及指标选取[J].东北大学学报:自然科学版,2012,2(2):284-287.SHENG Guohua,ZHU Fusheng,XU Minglei.Performancebased seismic level division and lndex choosing for RC column strengthened with FRP[J].Journal of Northeastern University:Natural Science,2012,2(2):284-287.(in Chinese)
[2]韩建平,吕西林,李慧.基于性能的地震工程研究的新进展及对结构非线性分析的要求[J].地震工程与工程振动,2007,27(4):15-23.(in Chinese)HAN Jianping,LU Xilin,LI Hui.State-of-the-art of performance-based earthquake engineering and need for structural nonlinear analysis[J].Journal of Earthquake Engineering and Engineering Vibration,2007,27(4):15-23.(in Chinese)
[3]Lam L,Teng J G.Strength models for fiber-reinforced plastic-confined concrete[J].Journal of Structural Engineering,2002,(128):612-623.
[4]Ozcana O,Binicib B,Ozcebeb G.Seismic strengthening of rectangular reinforced concrete columns using fiber reinforced polymers[J].Engineering Structures,2010,32:964-973.
[5]Colomb F,Tobbi H,Ferrier E,et al.Seismic retrofit of reinforced concrete short columns by CFRP materials[J].Composite Structures,2008,(82):475-487.
[6]Mahini S S,Ronagh Hamid R.Strength and ductility of FRP web-bonded RC beams for the assessment of retrofitted beam-column joints[J].Composite Structures,2010,(92):1325-1332.
[7]Tsonos A G.Effectiveness of CFRP-jackets and RC-jackets in post-earthquake and pre-earthquake retrofitting of beam-column subassemblages[J].Engineering Structures,2008,(30):777-793.
[8]王步,王溥.碳纤维布加固混凝土梁柱节点抗震性能试验研究[J].建筑结构,2006,12(36):60-64.WANG Bu,WANG Pu.Experimental study on seismic behavior of RC beam-column joints upgraded by CFRP sheets[J].Building Structure,2006,12(36):60-64.(in Chinese)
[9]Priestley M J N,Kowalsky M J.Direct displacement-based seismic deign of concrete buildings[J].Bulletin,NZSEE,2000,33(4):421-444.
[10]盛国华,朱浮声,徐明磊.基于性能的FRP加固混凝土柱抗震水平及指标选取[J].东北大学学报:自然科学版,2012,2(2):284-287.SHENG Guohua,ZHU Fusheng,XU Minglei.Performancebased seismic level division and lndex choosing for RC column strengthened with FRP[J].Journal of Northeastern University:Natural Science,2012,2(2):284-287.(in Chinese)
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