钢筋混凝土连梁的变形能力及基于性能的抗震设计
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摘要
钢筋混凝土连梁作为重要的结构单元可以减少墙肢的弯矩并耗散地震能量。影响钢筋混凝土连梁变形能力的主要因素包括混凝土受压区高度系数ξ、跨高比χ和约束箍筋的配置等。建立了钢筋混凝土连梁的配箍特征值λ_(vb)、混凝土受压区高度系数ξ、跨高比χ与梁端塑性铰极限转动量θ_(plb)~u之间的量化关系,然后通过8个研究机构所进行的钢筋混凝土连梁试验进行了验证,提出了钢筋混凝土连梁基于性能的抗震设计方法。设计者可以在已知梁端塑性铰转动需求量θ_(plb)及确定损伤指标D_b的情况下对连梁进行配箍。
Reinforced concrete (RC) coupling beams are essential structural elements due to their ability to reduce the bending moment of coupled walls as well as their capacity to dissipate energy. Deformation capacity of RC coupling beams is influenced by relative depth coefficient of compression zone ξ, span/depth ratio χ, and concrete confinement. In this paper, the relationship of the confining reinforcement characteristic value λ_(vb), relative depth coefficient of compression zone ξ, span/depth ratioχ and the ultimate plastic hinge rotation θ_(vb)was established firstly. Then, the relationship was verified by the RC coupling beam experiments which were conducted by 8 research institutions. Based on the relationship, performance-based seismic design method for RC coupling beams was proposed. According to the method proposed in the paper, the transverse reinforcement of coupling beams could be assessed if the hinge rotation θ_(pib) and the damage index D_b are known.
Reinforced concrete (RC) coupling beams are essential structural elements due to their ability to reduce the bending moment of coupled walls as well as their capacity to dissipate energy. Deformation capacity of RC coupling beams is influenced by relative depth coefficient of compression zone ξ, span/depth ratio χ, and concrete confinement. In this paper, the relationship of the confining reinforcement characteristic value λ_(vb), relative depth coefficient of compression zone ξ, span/depth ratioχ and the ultimate plastic hinge rotation θ_(vb)was established firstly. Then, the relationship was verified by the RC coupling beam experiments which were conducted by 8 research institutions. Based on the relationship, performance-based seismic design method for RC coupling beams was proposed. According to the method proposed in the paper, the transverse reinforcement of coupling beams could be assessed if the hinge rotation θ_(pib) and the damage index D_b are known.
引文
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[3] 周定松,吕西林,蒋欢军.钢筋混凝土框架梁的变形能力及基于性能的抗震设计方法[J].地震工程与工程振动,2005,25(4) :60-66．
[4] 清华大学抗震抗爆工程研究室.科学研究报告集(3) :钢筋混凝土结构的抗震性能[M].北京:清华大学出版社,1981．
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[7] 李明书,李吉勋,齐铭扬.现浇钢筋混凝土剪力墙结构中连梁的抗震性能试验研究[C]//第八届全国高层建筑结构学术交流会论文集,1984:112-132．
[8] 杨彦芳.低周反复荷载作用下联肢剪力墙中连梁的强度及抗震性能的试验研究[D].重庆:重庆建筑大学,1998．
[9] 张彬彬.高层建筑剪力墙连梁抗震性能的试验研究[D].重庆:重庆大学,2001．
[10] 刘光伟.小跨高比剪力墙洞口连梁抗震性能试验研究[D].重庆:重庆大学,2006．
[11] 吴波,刘志强,林少书,等.香港现役钢筋混凝土连梁的抗震性能试验研究[J].世界地震工程,2002,18(2) :9-16．
[12] 刘志强,吴波,林少书.钢筋混凝土连梁的抗震性能研究[J].地震工程与工程振动,2003,10(5) :117-124．
[13] Tassios T P,Moretti M ,Bezas A.On the behavior and ductility of reinforced concrete coupling beams of shear walls[J].ACI Structural Journal,1996 ,93(6) :711-720．
[14] SEAOC.Vision 2000,Conceptual framework for performance-based seismic design[R].Sacramento,1995．
[15] ATC.ATC-40,Seismic evaluation and retrofit of concrete building[R].Redwood City,CA,1996．
[16] 黄志华,吕西林,周颖,等.不同R-μ-T关系对比研究及其在高层混合结构位移需求估计中的应用[J].地震工程与工程振动,2009,29(2) :42-50．
[2] 吕西林,周定松,蒋欢军.钢筋混凝土框架柱的变形能力及基于性能的抗震设计方法[J].地震工程与工程振动,2005,25(6) :53-61．
[3] 周定松,吕西林,蒋欢军.钢筋混凝土框架梁的变形能力及基于性能的抗震设计方法[J].地震工程与工程振动,2005,25(4) :60-66．
[4] 清华大学抗震抗爆工程研究室.科学研究报告集(3) :钢筋混凝土结构的抗震性能[M].北京:清华大学出版社,1981．
[5] 龚炳年.钢筋混凝土连系梁的抗震性能[D].北京:清华大学,1986．
[6] Zhao Z Z,Kwan A K H.Nonlinear behavior of deep reinforced concrete coupling beams[J].Structural Engineering and Mechanics,2003,15 (2) :181-198．
[7] 李明书,李吉勋,齐铭扬.现浇钢筋混凝土剪力墙结构中连梁的抗震性能试验研究[C]//第八届全国高层建筑结构学术交流会论文集,1984:112-132．
[8] 杨彦芳.低周反复荷载作用下联肢剪力墙中连梁的强度及抗震性能的试验研究[D].重庆:重庆建筑大学,1998．
[9] 张彬彬.高层建筑剪力墙连梁抗震性能的试验研究[D].重庆:重庆大学,2001．
[10] 刘光伟.小跨高比剪力墙洞口连梁抗震性能试验研究[D].重庆:重庆大学,2006．
[11] 吴波,刘志强,林少书,等.香港现役钢筋混凝土连梁的抗震性能试验研究[J].世界地震工程,2002,18(2) :9-16．
[12] 刘志强,吴波,林少书.钢筋混凝土连梁的抗震性能研究[J].地震工程与工程振动,2003,10(5) :117-124．
[13] Tassios T P,Moretti M ,Bezas A.On the behavior and ductility of reinforced concrete coupling beams of shear walls[J].ACI Structural Journal,1996 ,93(6) :711-720．
[14] SEAOC.Vision 2000,Conceptual framework for performance-based seismic design[R].Sacramento,1995．
[15] ATC.ATC-40,Seismic evaluation and retrofit of concrete building[R].Redwood City,CA,1996．
[16] 黄志华,吕西林,周颖,等.不同R-μ-T关系对比研究及其在高层混合结构位移需求估计中的应用[J].地震工程与工程振动,2009,29(2) :42-50．
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