底部开水平缝预应力自复位剪力墙试验设计及结果分析
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摘要
底部开水平缝预应力自复位剪力墙在墙体与基础连接处的两端对称设置水平缝,中间部分保持正常连接,同时在墙体内设置无黏结预应力钢绞线提供自复位能力。水平缝减少了墙体角部混凝土中拉应力的产生,并引导墙体裂缝仅在连接处开展;中部正常连接部分通过钢筋与混凝土的共同作用提供一定的抗滑移能力,并通过其中钢筋的屈服耗能;无黏结预应力钢绞线通过在弹性范围内变形为剪力墙提供自复位能力。本文介绍了低周反复荷载下底部开水平缝预应力自复位剪力墙的试验设计、试件制作和试验结果。结果表明,底部开水平缝预应力自复位剪力墙试件有较好的自复位能力,且承载力与普通剪力墙相当;相对于传统摇摆墙,耗能能力较好。
Horizontal slits are placed symmetrically at the wall ends on the wall-foundation interface of pre-stressed shear walls,and the concrete in the middle of the wall remains connected. Furthermore,unbonded pre-stressed tendon is introduced inside the wall to provide self-centering ability. The tension stress at the wall toes is reduced by setting of horizontal slits,and cracking in the wall extends mainly on the wall-foundation interface under the conduction of the pre-slits. Horizontal slide of the wall is prevented because of the combined action of concrete and reinforcements,which are used here to dissipate energy. Self-centering ability is guaranteed by unbonded pre-stressed tendon,which is deformed in the elastic scope. This paper introduces the testing design,specimen construction and results of testing of pre-stressed self-centering shear walls with horizontal bottom slit under cyclic loading. It indicates that the shear walls with bottom slit behave with excellent self-centering ability while remains lateral load capacity as normal shear wall,and the energy dissipating ability is better than the traditional rocking shear wall.
Horizontal slits are placed symmetrically at the wall ends on the wall-foundation interface of pre-stressed shear walls,and the concrete in the middle of the wall remains connected. Furthermore,unbonded pre-stressed tendon is introduced inside the wall to provide self-centering ability. The tension stress at the wall toes is reduced by setting of horizontal slits,and cracking in the wall extends mainly on the wall-foundation interface under the conduction of the pre-slits. Horizontal slide of the wall is prevented because of the combined action of concrete and reinforcements,which are used here to dissipate energy. Self-centering ability is guaranteed by unbonded pre-stressed tendon,which is deformed in the elastic scope. This paper introduces the testing design,specimen construction and results of testing of pre-stressed self-centering shear walls with horizontal bottom slit under cyclic loading. It indicates that the shear walls with bottom slit behave with excellent self-centering ability while remains lateral load capacity as normal shear wall,and the energy dissipating ability is better than the traditional rocking shear wall.
引文
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[2]吕西林,陈云,毛苑君.结构抗震设计的新概念——可恢复功能结构[J].同济大学学报:自然科学版,2011,39(7):941-948.LU Xilin,CHEN Yun,MAO Yuanjun.New concept of structural seismic design:earthquake resilient structures[J].Journal of Tongji University(Natural Science),2011,39(7):941-948.(in Chinese)
[3]党像梁,吕西林,周颖.底部开水平缝摇摆剪力墙抗震性能分析[J].地震工程与工程振动,2013,33(5):182-189.DANG Xiangliang,LU Xilin,ZHOU Ying.Study on seismic performance of a rocking wall with bottom horizontal slits[J].Journal of Earthquake Engineering and Engineering Vibration,2013,33(5):182-189.(in Chinese)
[4]Stanton J,Stone W C,Cheok G S.A hybrid reinforced precast frame for seismic regions[J].PCI journal,1997,42(2):20-32.
[5]Pampanin,S.,Marriott,D.,Palermo,A.PRESSS design handbook[M].NZCS,2010.
[6]ACI Innovation Task Group 5.Acceptance criteria for special unbonded post-tensioned precast structural walls based on validation testing(ITG 5.1-07)[M].ACI,2007.
[7]Kurama,Y.C.Hybrid post-tensioned precast concrete walls for use in seismic regions[J].PCI Journal,2002,47(5):36-59.
[8]ACI Innovation Task Group 5.Requirements for design of a special unbonded post-tensioned precast shear wall satisfying ACI ITG-5.1(ITG 5.2-09)[M].ACI,2009.
[9]GB 50010-2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.GB 50010-2010 Concrete Structure Design Code[S].Beijing:China Building Industry Press,2010.(in Chinese)
[10]Perez F J,Sause R,Pessiki S.Analytical and experimental lateral load behavior of unbonded posttensioned precast concrete walls[J].Journal of Structural Engineering,2007,133(11):1531-1540.
[11]Kurama Y,Sause R,Pessiki S,et al.Lateral load behavior and seismic design of unbonded post-tensioned precast concrete walls[J].ACI Structural Journal,1999,96(4):622-633.
[12]JGJ 101-1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.JGJ 101-1996 Specificating of Testing Methods for Earthquake Resistant Building[S].Beijing:China Building Industry Press,1997.(in Chinese)
[13]李忠献.工程结构试验理论与技术[M].天津:天津大学出版社,2004.LI Zhongxian.Theory and technique of engineering structure experiments[M].Tianjin:Tianjin University Press,2004.(in Chinese)
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