轴压比对RC框架实现“强柱弱梁”的影响研究
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摘要
针对现浇楼板中板筋对纵向梁抗弯能力的提高作用,采用ABAQUS进行不同轴压比下的RC空间框架结构非线性分析,通过不同节点处的梁、柱钢筋应力对比,讨论了不同轴压比对应的结构和同一结构中不同节点位置在实现"强柱弱梁"上的难易程度以及梁端塑性铰的出现条件。研究结果表明,轴压比对板筋在纵向梁抗弯能力中参与程度的影响较大,低轴压比的结构比高轴压比的结构更容易出现梁端塑性铰;同一结构中内节点对应的纵向梁端比外节点更难出现塑性铰;为实现"大震不倒",建议在满足现行结构设计规范提出的相关要求外,对同一节点处的梁、柱端实际承载能力进行复核,使得考虑了现浇楼板参与作用后的梁端实际承载力依然小于柱端实际承载力。
As slab reinforcement will make the longitudinal beam overstrengthen in cast-in-place RC frame structures,a series of RC frame structures with different axial compression ratios are simulated by ABAQUS.The influences of axial compression ratios on the participation extent of the slab reinforcement in longitudinal beam overstrength are studied.The actualization of strong-column and weak-beam philosophy is analyzed in the RC frame structures with different axial compression ratios and at different connections.The occurring condition of a plastic hinge at beam end is discussed.It indicates that the axial compression ratios can greatly influence the participation extent of the slab reinforcement and it is easier for the occurring of plastic hinges at beam end in the RC frame structures with low axial compression ratio than that with high axial compression ratios.Moreover,it is more difficult for the occurring of plastic hinges at beam end at interior connections than that at exterior connections in the same structure.In order to actualize the no collapsing target of structures in strong earthquakes more effectively,it is recommended that the actual capacity of the beam end with considering the slab participation should be still smaller than the actual capacity of column end at the same connection.
As slab reinforcement will make the longitudinal beam overstrengthen in cast-in-place RC frame structures,a series of RC frame structures with different axial compression ratios are simulated by ABAQUS.The influences of axial compression ratios on the participation extent of the slab reinforcement in longitudinal beam overstrength are studied.The actualization of strong-column and weak-beam philosophy is analyzed in the RC frame structures with different axial compression ratios and at different connections.The occurring condition of a plastic hinge at beam end is discussed.It indicates that the axial compression ratios can greatly influence the participation extent of the slab reinforcement and it is easier for the occurring of plastic hinges at beam end in the RC frame structures with low axial compression ratio than that with high axial compression ratios.Moreover,it is more difficult for the occurring of plastic hinges at beam end at interior connections than that at exterior connections in the same structure.In order to actualize the no collapsing target of structures in strong earthquakes more effectively,it is recommended that the actual capacity of the beam end with considering the slab participation should be still smaller than the actual capacity of column end at the same connection.
引文
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[2]Pantazopoulou S J,French C W.Slab participation in practical earthquake design of reinforced concrete frame[J].ACI Structural Journal,2001,98(4):479-489.
[3]French C W.Effect of floor slab on behavior of slab-beam-column connections[C].ACI SP-123,Design of Beam-Column Joints for SeismicResistance.1991.
[4]French C W,Boroojerdi A.Contribution of RC floor slabs in resisting lateral loads[J].Journal of Structural Engineering,ASCE,1989,115(1):1-18.
[5]王素裹,韩小雷,季静,等.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.Wang Suguo,Han Xiaolei,Ji Jing,et al.Study on influence of cast-in-place slab on main beams in RC frame[J].South China Journal of Seis-mology,29(2):35-41.
[6]叶列平,曲哲,马千里,等.从汶川地震框架结构震害谈“强柱弱梁”屈服机制的实现[J].建筑结构,2008,38(11):52-59.Ye Lieping,Qu Zhe,Ma Qianli,et al.Study on ensuring the strong column-weak beam mechanism for RC frames based on the damage analysisin the Wenchuan Earthquake[J].Building Structures,2008,38(11):52-59.
[7]傅学怡.汶川、台湾建筑震害启示——改进规范的几点建议[J].建筑结构,2008,38(7):15-16Fu Xueyi.Some improved recommendation on the building design code[J].Building Structures,2008,38(7):15-16.
[8]肖从真.汶川地震震害调查与思考[J].建筑结构,2008,38(7):21-24.Xiao Congzhen.The investigation and discussion on the damage in Wenchuan Earthquake[J].Building Structures,2008,38(7):21-24.
[9]冯远,肖克艰,刘宜丰.汶川地震灾害引发建筑结构设计者的思考[J].建筑结构,2008,38(7):25-27.Feng Yuan,Xiao Kejian,Liu Yifeng.The derivate Reflection of building strcuture design in the Wenchuan Earthquake[J].Building Structures,2008,38(7):25-27.
[10]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):66-71Wang Suguo,Han Xiaolei,Ji Jing.The effect of slabs on the failure mode of reinforced concrete frame structures[J].Journal of Civil Architec-tural&Environmental Engineering,2009,31(1):66-71.
[11]GB50009-2001,建筑结构荷载规范[S].GB50009-2001,Load Code for the Design of Building Structures[S].
[12]GB50011-2001,建筑抗震设计规范[S].GB50011-2001,Code for Seismic Design of Buildings[S].
[13]GB50010-2002,混凝土结构设计规范[S].GB50010-2002,Code for Design of Concrete Structures[S].
[14]邱洪兴,舒赣平,曹双寅.建筑结构设计[M].南京:东南大学出版社,2002.Qiu Hongxing,Shu Ganping,Cao Shuangyin.The Design of Building Structures[M].Nanjing:Southeast University Press,2002.
[15]周靖,蔡健,方小丹.钢筋混凝土框架结构抗震超强系数分析[J].世界地震工程.2007,23(4):227-233.Zhou Jing,Cai Jian,Fang Xiaodan.Seismic overstrength factors for reinforced concrete frames[J].World Earthquake Engineering,2007,23(4):227-233.
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