摘要
针对平板异形柱节点冲切试验很少以及现行规范没有明确规定的情况,进行了5个无粘结预应力混凝土平板T形柱节点试件和1个钢筋混凝土平板T形柱节点试件的冲切性能对比试验.阐述了无粘结预应力混凝土平板T形柱节点的冲切受力性能和破坏特征,研究了无粘结预应力钢筋应力变化特点以及抗冲切箍筋、板暗梁面筋的应力变化特点,并将其受力性能与具有相同板厚和相同板面平均配筋率的钢筋混凝土平板T形柱节点进行了对比,探讨了施加预压应力对平板异形柱节点冲切受力性能的影响.试验结果表明,与相应的钢筋混凝土平板T形柱节点试件相比,施加一定预压应力的试件具有相当的延性和较好的抗冲切受力性能;增加预压应力可提高节点的冲切承载力.最后采用ACI318—02,Eurocode2和GB50010—2002所推荐的计算公式对上述节点的冲切承载力进行了验算,提出规范公式均适用于计算平板异形柱节点冲切承载力的设计建议.
Since the punching shear behavior of unbonded prestressed concrete flat slab-specialshaped column connections was less investigated and there was no definite specification in current code, an experimental study was carried out. Five prestressed concrete specimens and one reference specimen with no prestressing were tested under equal gravity loads. The failure features and mode of the specimens were presented. The stress of the unbonded prestressed bars, the strain of the top flexural reinforcements and the stirrups in slab were investigated. The influences of limited prestress on punching shear strength were studied. The test results show that the prestressed concrete specimens keep fair ductility and have better punching shear behaviors than the reinforced concrete specimen. Increasing the prestressing level could improve the punching shear strength. The test results on the punching shear strength were compared with the calculation results from the formulae proposed by ACI 318 -- 02, Eurocode 2 and GB 50010 -- 2002. And it is shown that the formulae proposed by these codes are suitable in be adopted in design。
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第4期563-568,共6页
Journal of Southeast University：Natural Science Edition
关键词
无粘结预应力混凝土
平板-T形柱节点
试验研究
冲切承载力
unbounded prestressed concrete
flat slab-T-shaped column connection
experimental study
punching shear strength
作者简介
李光星（1972-），男，博士生；
蔡健（联系人），男，博士，教授，博士生导师，cvjcai@scut．edu．cn．
