现浇框架结构柱端CFRP加固强柱弱梁效果分析
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摘要
为研究柱端碳纤维增强复合材料(CFRP)加固对框架结构强柱弱梁效果的影响,利用有限元软件ANSYS对一栋三层现浇钢筋混凝土框架结构做了拟静力数值分析,考虑了现浇楼板对梁抗弯承载力的影响,对框架结构普通梁板柱节点和柱端用碳纤维加固节点的计算结果进行了对比。分析结果表明,梁肋附近楼板钢筋应力随梁端弯矩加大而明显增加,现浇楼板内钢筋对梁抗弯承载力提高的影响不容忽视。在节点处采用外包碳纤维布加固,可以提高框架柱的抗弯能力及延性,使塑性铰首先出现在梁端,使钢筋混凝土框架结构在地震作用下,破坏时更接近"强柱弱梁"的特点。
In order to study the strong column and weak beam effect of the column ends reinforced with carbon fiber reinforced polymer(CFRP),a numerical quasi-static model was established with ANSYS software for a three-storey reinforced concrete frame structure.The results for traditional joints specified in the design code and for the joints retrofitted with CFRP were compared.It was found that the stress in the reinforce bars for slab close to the beam increases significantly with the applied top displacement of the structure in horizontal direction,but increases slightly for slab far from the beam.For the joints retrofitted with CFRP,the yielding of column reinforce bars will be delayed,while the number of cracks on beams increases,which tend to exhibit a failure type closer to the beam-pivot or ductile mode.
In order to study the strong column and weak beam effect of the column ends reinforced with carbon fiber reinforced polymer(CFRP),a numerical quasi-static model was established with ANSYS software for a three-storey reinforced concrete frame structure.The results for traditional joints specified in the design code and for the joints retrofitted with CFRP were compared.It was found that the stress in the reinforce bars for slab close to the beam increases significantly with the applied top displacement of the structure in horizontal direction,but increases slightly for slab far from the beam.For the joints retrofitted with CFRP,the yielding of column reinforce bars will be delayed,while the number of cracks on beams increases,which tend to exhibit a failure type closer to the beam-pivot or ductile mode.
引文
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[10]陆洲导,宋彦涛,王李果.碳纤维加固混凝土框架节点的抗震试验研究[J].结构工程师,2004,20(5):39-43.
[11]周乾,阎维明,纪金豹,等.CFRP加固古建筑榫卯节点振动台试验[J].广西大学学报:自然科学版,2011,36(1):37-43.
[12]王苏岩,韩克双.纤维增强复合材料(FRP)加固混凝土柱的性能研究进展[J].地震工程与工程振动,2004,24(1):97-104.
[13]冼巧玲,江传良,周福霖.混凝土框架节点碳纤维布抗震加固的试验分析[J].地震工程与工程振动,2007,27(2):104-111.
[14]赵彤,刘明国,谢剑,等.应用碳纤维布增强钢筋混凝土柱抗震能力的研究[J].地震工程与工程振动,2000,20(4):66-72.
[15]李静,钱稼茹,蒋剑彪.纤维布约束混凝土矩形柱轴心受压试验及非线性有限元分析[J].建筑结构学报,2004,25(2):110-117.
[16]余琼,陆洲导.柱加大截面加固与碳纤维加固框架节点的比较与分析[J].结构工程师,2007,23(2):91-95.
[2]苏幼坡,张玉敏,王绍杰,等.从汶川地震看提高建筑结构抗倒塌能力的必要性和可行性[J].土木工程学报,2009,42(5):25-32.
[3]EHASANI M R,WIJHT J K.Effect of transverse beams and slab on behavior of reinforced concrete beam-to-column con-nections[J].ACI Journal Technical Paper,1985,82(7):188-195.
[4]LAFAVE J M,WIJHT J K.Reinforced concrete exterior beam-column-stab connections subjected to lateral earthquakeloading[J].ACI Structural Journal,1999,96(4):577-585.
[5]MAALE M,LEONG K S.Effect of beam size and FRP thickness on interfacial shear stress concentration and failure modeof FRP-strengthened beams[J].Composites Science and Technology,2005,65(3):1148-1158.
[6]WEGIAN F M,ABDALLA H A.Shear capacity of concrete beams reinforced with fiber reinforced polymers[J].CompositeStructures,2005,71(6):130-138.
[7]GYUSEON K,JONGSUNHG S,HONGSEOB O.Shear strength of strengthened RC beams with FRPS in shear[J].Con-struction and Building Materials,2008,22(2):1261-1270.
[8]陆洲导,谢丽萍,洪涛.混凝土框架节点碳纤维布抗震加固的试验与分析[J].同济大学学报,2003,31(3):253-257.
[9]谢剑,刘明学,赵彤.碳纤维布提高高强混凝土柱抗震能力评估方法[J].天津大学学报,2005,38(2):109-113.
[10]陆洲导,宋彦涛,王李果.碳纤维加固混凝土框架节点的抗震试验研究[J].结构工程师,2004,20(5):39-43.
[11]周乾,阎维明,纪金豹,等.CFRP加固古建筑榫卯节点振动台试验[J].广西大学学报:自然科学版,2011,36(1):37-43.
[12]王苏岩,韩克双.纤维增强复合材料(FRP)加固混凝土柱的性能研究进展[J].地震工程与工程振动,2004,24(1):97-104.
[13]冼巧玲,江传良,周福霖.混凝土框架节点碳纤维布抗震加固的试验分析[J].地震工程与工程振动,2007,27(2):104-111.
[14]赵彤,刘明国,谢剑,等.应用碳纤维布增强钢筋混凝土柱抗震能力的研究[J].地震工程与工程振动,2000,20(4):66-72.
[15]李静,钱稼茹,蒋剑彪.纤维布约束混凝土矩形柱轴心受压试验及非线性有限元分析[J].建筑结构学报,2004,25(2):110-117.
[16]余琼,陆洲导.柱加大截面加固与碳纤维加固框架节点的比较与分析[J].结构工程师,2007,23(2):91-95.
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