塑性铰区采用纤维增强混凝土柱抗震性能试验研究

发布时间：2018-02-16 09:47

本文关键词： 钢筋混凝土柱纤维增强混凝土拟静力试验损伤容限变形能力　出处：《建筑结构学报》2014年02期 　论文类型：期刊论文

【摘要】：为了提高钢筋混凝土柱的抗震性能,考虑在其潜在的塑性铰区采用纤维增强混凝土(FRC)代替普通混凝土。设计6个剪跨比为3、柱内箍筋配置较少的钢筋混凝土柱试件,其中5个试件的潜在塑性铰区采用了FRC,另外1个试件的潜在塑性铰区未采用FRC,并对其进行拟静力试验。通过改变FRC区高度和强度以及柱轴压比,观测试件在低周反复水平荷载作用下的裂缝开展和破坏过程,研究其滞回特性、变形能力及耗能能力。结果表明,与普通钢筋混凝土柱相比,塑性铰区采用FRC且柱内箍筋配置较少的柱,其破坏形态为纵向受力钢筋屈服后的剪切破坏,具有较好的变形能力和损伤容限;在材料强度、柱轴压比不变时,FRC区高度增加1倍,位移延性系数、极限位移角分别提高45%和21%,耗能能力提高81%;局部使用FRC可以减少约束箍筋和抗剪箍筋用量。
[Abstract]:In order to improve the seismic behavior of reinforced concrete columns, fiber reinforced concrete (FRC) is used to replace ordinary concrete in its potential plastic hinges. Six specimens of reinforced concrete columns with a shear span ratio of 3 and less stirrups in columns are designed. The potential plastic hinge region of five specimens is FRC, while the other one is not, and the pseudostatic test is carried out. By changing the height and strength of the FRC zone and the axial compression ratio of the column, The crack development and failure process of the specimens under low cyclic cyclic horizontal load are studied. The hysteretic characteristics, deformation capacity and energy dissipation capacity of the specimens are studied. The results show that, compared with ordinary reinforced concrete columns, In the plastic hinge region, the column with less stirrups in the column has good deformation capacity and damage tolerance due to shear failure after the longitudinal stress of the steel bar yields, and the height of the column increases twice when the axial compression ratio of the column is constant, and the deformation capacity and damage tolerance of the column are better when the axial compression ratio of the column is constant. The displacement ductility coefficient and ultimate displacement angle are increased by 45% and 21, respectively, and the energy dissipation capacity is increased by 81.The local use of FRC can reduce the amount of confined stirrups and shear stirrups.
【作者单位】：西安建筑科技大学土木工程学院;中国石油工程建设公司华东设计分公司;
【基金】：国家自然科学基金项目(51278402,51078305) 长江学者和创新团队发展计划资助项目(PCsIRT) 西安建筑科技大学“混凝土结构体系抗震与灾变控制”创新团队基金项目
【分类号】：TU377;TU352.11

【参考文献】