设置角缝现浇钢筋混凝土框架节点楼板抗震性能研究
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摘要
利用有限元软件ADINA对现浇钢筋混凝土框架节点做了拟静力分析。对普通梁柱节点及周围楼板设角缝节点的计算结果做了对比。结果表明,随着加载位移的增加,梁肋附近楼板钢筋应力有明显增加,说明楼板对梁的抗弯能力有增强的作用。在不影响节点承载力的条件下,楼板设角缝能局部削弱梁的抗弯能力,梁受力主筋屈服时间明显提前,梁筋屈服时柱身混凝土裂缝也有所减少,梁端与柱端塑性铰出现时间间隔加大,使节点在受到地震作用破坏时更接近梁铰机制的特点。
A numerical pseudo-static model was established with ADINA software for beam-column interior joint on a reinforced concrete frame.The results for the traditional joint specified in design code and those for the joint with slot around were compared.It is shown that the stress in the reinforcement for the slab close to the beam will increase significantly with the applied top displacement in horizontal direction,but slightly for the slab far from the beam.It is also shown that for the joint with slot around,the yielding time of the beam reinforcement will shift to an earlier time,while number of cracks on column becomes less.The time interval between the occurrences of plastic hinge on beam and on the column becomes longer,which exhibits a failure type closer to the beam-hinge mode.
A numerical pseudo-static model was established with ADINA software for beam-column interior joint on a reinforced concrete frame.The results for the traditional joint specified in design code and those for the joint with slot around were compared.It is shown that the stress in the reinforcement for the slab close to the beam will increase significantly with the applied top displacement in horizontal direction,but slightly for the slab far from the beam.It is also shown that for the joint with slot around,the yielding time of the beam reinforcement will shift to an earlier time,while number of cracks on column becomes less.The time interval between the occurrences of plastic hinge on beam and on the column becomes longer,which exhibits a failure type closer to the beam-hinge mode.
引文
[1]GB50011-2001,建筑抗震设计规范[S].
[2]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989.
[3]French C W,Moehle J P.Effect of Floor Slab on Behavior of Slab-Beam-Column Connections[J].Design of Beam-Column Joints forSeismic Resistance,SP-123,American Concrete Institute,Farmington Hills,Mich,1991(45):225～258.
[4]蒋永生,陈忠范,周绪平,等.整浇梁板的框架节点抗震研究[J].建筑结构学报,1994,15(6):11～16.
[5]蔡健,方靖,方小舟.柱端弯矩增大系数取值对RC框架结构抗震性能影响的评估[J].土木工程学报,2007,40(1):6～14.
[6]苏幼坡,张玉敏,王绍杰,徐建新.从汶川地震看提高建筑结构抗倒塌能力的必要性和可行性[J].土木工程学报,2008,6:1～10.
[7]王素裹,韩小雷,季静,王传峰.现浇楼板对框架梁受力影响的研究[J].华南地震,2009,29(2):35～41.
[8]王素裹,韩小雷,季静.现浇楼板对RC框架结构破坏形式的影响分析[J].土木建筑与环境工程,2009,31(1):66～71.
[2]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989.
[3]French C W,Moehle J P.Effect of Floor Slab on Behavior of Slab-Beam-Column Connections[J].Design of Beam-Column Joints forSeismic Resistance,SP-123,American Concrete Institute,Farmington Hills,Mich,1991(45):225～258.
[4]蒋永生,陈忠范,周绪平,等.整浇梁板的框架节点抗震研究[J].建筑结构学报,1994,15(6):11～16.
[5]蔡健,方靖,方小舟.柱端弯矩增大系数取值对RC框架结构抗震性能影响的评估[J].土木工程学报,2007,40(1):6～14.
[6]苏幼坡,张玉敏,王绍杰,徐建新.从汶川地震看提高建筑结构抗倒塌能力的必要性和可行性[J].土木工程学报,2008,6:1～10.
[7]王素裹,韩小雷,季静,王传峰.现浇楼板对框架梁受力影响的研究[J].华南地震,2009,29(2):35～41.
[8]王素裹,韩小雷,季静.现浇楼板对RC框架结构破坏形式的影响分析[J].土木建筑与环境工程,2009,31(1):66～71.
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