摘要
现有的试验结果表明,钢筋混凝土(RC)柱受剪承载力在位移延性系数大于2后随着侧向位移的增加会逐渐下降。为了确保RC柱发生延性较好的弯曲破坏,在地震作用下柱子承受的侧向荷载要小于柱子受剪承载力的最终值。通过31个在模拟地震作用下发生剪切破坏的大比例圆柱试验结果对现有受剪承载力计算模型精度进行讨论,发现规范公式的计算结果普遍偏于保守,Priestly提出的公式考虑了位移延性系数的影响,具有较高的精度。计算结果还发现,我国规范公式计算结果和Priestly公式计算的受剪承载力最终值比较接近,可以用来计算受剪承载力最终值。
The experimental results indicate that the shear strength of reinforced concrete(RC) columns reduced with the increase of flexural ductility for displacement ductility factors in excess of 2.In order to have good ductility,the shear force generated during earthquakes should be less than the final shear strength of RC columns.Exiting design expressions for shear strength of circular columns are discussed and compared with the results of 31 circular columns tested under simulated seismic loading.It is shown that existing code design equations are very conservative for shear strength,however,the model proposed by Priestly,which can consider the influence of the flexural ductility on shear strength,has good precision.It is also found that the calculated results from China design code equations compares well with the final shear strength from Priestly model,and both can be used to calculate the final shear strength of RC columns.
出处
《土木工程学报》
EI
CSCD
北大核心
2010年第S1期118-123,共6页
China Civil Engineering Journal
基金
国家自然科学基金(50608015
50908102)
江苏省结构工程重点实验室课题(ZD1001)
关键词
RC圆柱
受剪承载力
侧向位移
延性
RC circular columns
shear strength
lateral displacement
ductility
