为了研究钢筋混凝土（reinforced concrete，简称RC）短柱的抗震性能，通过低周反复破坏试验对其抗震性能的尺寸效应进行了分析。试验主要考虑了截面尺寸和箍筋形式的影响，RC短柱的截面分别设计为200mm×200mm、400mm×400m和600mm×600mm，箍筋主要分为普通方形箍筋和井字箍筋。结果表明：配有普通方箍筋的RC短柱均表现出斜拉破坏特征，脆性破坏特征明显，而配有井字箍筋较大尺寸的RC短柱（边长为400mm和600mm）为剪压破坏；随着RC短柱截面边长的增加，其名义抗剪强度、延性和平均耗能系数均逐渐减小，并且配有井字箍筋的RC短柱相对于配有普通方形箍筋的短柱，其减小的速率逐渐变小。通过考虑截面尺寸和箍筋的影响作用，提出了修正的RC短柱的抗剪承载计算模型，并建立了考虑尺寸效应的RC短柱恢复力模型，计算结果与试验结果较吻合。
Abstract
In order to study the seismic performance of reinforced concrete (RC) short columns, all the RC short columns were tested to failure under low-cycle repeated loading to study the effects of section size on seismic performance. The experiment mainly considered the influence of cross-sectional size and stirrup form. The sections of RC short columns are designed to be 200mm×200mm, 400mm×400m, and 600mm×600mm, respectively. Stirrups are ordinary square stirrups and well-shaped stirrups. The results show that RC short columns with the square stirrup show the characteristics of diagonal tension failure, and the brittle failure characteristics of the specimen are obvious. The columns with larger sizes of well-shaped stirrup, such as section length is 400mm and 600mm, were tested to shear compression failure. With the increase of section size of RC columns, the nominal shear strength, ductility, and average energy dissipation coefficient of the RC columns gradually decrease. Compared to short columns equipped with ordinary square stirrups, the rate of reduction of RC short columns equipped with well-shaped stirrups gradually decreases. A modified shear bearing calculation model for RC short columns was proposed by considering the influence of cross-sectional dimensions and stirrups, and the hysteretic model of RC short columns considering size effects was established, the calculated results are in good agreement with the experimental results.
关键词
钢筋混凝土短柱 /
配箍形式 /
抗震性能 /
尺寸效应 /
恢复力模型
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Key words
RC short columns /
stirrup form /
seismic performance /
size effect /
hysteretic model
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