摘要
对10个配置HRB335、HRB500E、HRB600钢筋的混凝土矩形截面柱进行水平低周反复荷载作用下的拟静力试验,对比分析钢筋等体积和等强度代换时,纵筋强度、箍筋强度、混凝土强度等因素对试件破坏状态、滞回曲线、骨架曲线、受弯承载力及延性性能的影响。结果表明:配置不同强度钢筋的矩形截面柱试件均发生典型的弯曲破坏,柱底形成塑性铰,纵筋断裂,试件具有较好的变形能力和延性性能;钢筋等体积代换时,纵筋强度对试件承载力和变形能力影响较大,箍筋强度影响较小;钢筋等强度代换时,试件抗震性能基本保持不变,采用高强钢筋可以减小钢筋用量;随着混凝土强度的提高,试件刚度增大,导致屈服位移减小,位移延性系数增大。
Reversed cyclic loading tests of ten reinforced concrete rectangular column specimens reinforced with HRB335,HRB500 E and HRB600 rebar were conducted.The test parameters included the longitudinal reinforcement strength,transverse reinforcement strength and concrete strength when equal volume and equal strength steel replacement method were employed.The effects of these parameters on the failure mechanism,load-deflection hysteretic-curve,skeleton curve,flexural capacity and displacement ductility were compared and analyzed.The results indicate that the concrete columns reinforced with different strength rebar present typical flexural failure mode where column bottom appears plastic hinge and longitudinal reinforcement fracture and show good deformability and displacement ductility.Under equal volume steel replacement,longitudinal reinforcement strength has a great effect while transverse reinforcement strength has little effect on deformability and displacement ductility of concrete columns.The columns reinforced with different strength rebar have similar seismic performance when high strength steel replaces ordinary strength steel with equal strength steel replacement,which will result in a less steel assumption.With the increase of concrete strength,the stiffness of specimen increases,resulting in the decrease of yield displacement and increase of displacement ductility.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2014年第11期20-27,共8页
Journal of Building Structures
基金
贵州省"十二五"重大科技专项(黔科合重大专项[2011]6014)
国家重点基础研究发展计划(2013CB036305)
国家自然科学基金项目(51278373)
关键词
钢筋混凝土柱
高强度钢筋
拟静力试验
延性
抗震性能
reinforced concrete column
high strength steel
quasi-static test
ductility
seismic performance
