钢纤维混凝土双肢剪力墙抗震性能试验研究
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摘要
钢筋混凝土剪力墙结构以其良好的承载能力和抗震性能被广泛应用于高层建筑。联肢剪力墙作为剪力墙结构的一大分支,以连梁作为墙肢之间的传力纽带,在地震作用以及风荷载的水平作用下,具有良好的抗侧变形能力。为了保证结构具有足够的侧向刚度以满足建筑使用功能的要求,高层建筑联肢剪力墙结构中经常使用跨高比较小的连梁。已有试验研究及地震灾害表明,普通钢筋混凝土的小跨高比连梁往往出现剪切型破坏形态,导致联肢剪力墙变成两片独立的墙肢,从而极大的降低了联肢剪力墙的抗震性能。
钢纤维混凝土以其卓越的延性特质及耗能性能得到了普遍认可,目前已广泛应用于道路、桥梁、工业民用建筑等行业。已有试验结论表明,分别在连梁和剪力墙中加入钢纤维混凝土,可有效的提高构件的整体刚度、延性和耗能能力,改善构件的承载力和抗裂性能。
本文通过对1片钢筋混凝土双肢剪力墙和2片不同钢纤维体积率的钢筋钢纤维混凝土双肢剪力墙进行低周反复加载试验,研究了钢纤维的加入对钢筋混凝土双肢剪力墙的承载力以及耗能能力的影响。主要研究内容如下：
(1)设计了1片钢筋混凝土双肢剪力墙和2片钢筋钢纤维混凝土双肢剪力墙,并根据试件的尺寸以及受力情况设计制作了相应的试验装置。
(2)对3个构件进行低周反复加载,研究了加载过程中连梁以及墙体的裂缝发展形态和分布。试验结果表明,钢纤维的加入对构件裂缝的分布和发展均产生明显的影响,减小了裂缝的宽度,对剪力墙的抗震性能影响比较显著。
(3)分析了不同钢纤维体积率对双肢剪力墙的承载力、延性、刚度以及耗能能力的影响。通过试验结果分析表明,普通混凝土双肢剪力墙中加入钢纤维,可提高构件整体的承载力、延性以及耗能能力,并且在一定程度上延缓了双肢剪力墙整体的刚度退化。
With excellent carrying capacity and seismic behavior, reinforced concrete shear wall structure is widely used in high-rise buildings. Coupled shear wall structure, a big embranchment of shear wall structure with coupling beams as the link of wall legs, have excellent lateral resisting ability under the earthquake action and the wind load. In high-rise building, in order to guarantee enough lateral stiffness or meet the functional requirements of the building, it often use coupling beam with low span-depth ratio. Existing experimental studies and earthquake disaster show, common reinforcement coupling beam with low span-depth ratio occurs generally shear destruction, thus turn the coupled shear wall into unattached walls and reduce stiffness of the structure extremely.
Steel fiber concrete has got social recognition by its excellent property of ductility and the property of energy absorption and dissipation, and has been widely used in transportation, bridge, and civil engineering. Existing experimental studies show that the steel fiber in the coupling beams and shear walls limit the development of cracks and improve the seismic performance of the structure.
In this paper, three coupled shear walls with different ratio of steel fiber have been tested by low cycle reverse. In order to study the seismic performance of coupled shear walls with steel fiber, this paper mainly completed the following job:
Three coupled shear walls with different ratio of steel fiber were produced. Experimental unit was designed to match the size of the test pieces and fulfills the actual situation,
The horizontal cyclic loading test, distribution and development of concrete crack were recorded in detail, was taken on three coupled shear walls with0.1axial compression ratio. The result showed that steel fiber caused obvious influence on distribution and development of cracks, and a notable one to the earthquake resistant behavior to the structure.
The result of the different steel fiber ratio in the coupled shear walls on the bearing capacity, ductility and the ability of seismic energy dissipation was analyse deeply. And it showed that the bearing capacity, ductility, behavior of dissipation seismic energy and the anti-crack performance of the coupled shear walls was generally improved with the concrete reinforced by steel fibers, the stiffness degeneration was also reduced at a certain degree.
钢纤维混凝土以其卓越的延性特质及耗能性能得到了普遍认可,目前已广泛应用于道路、桥梁、工业民用建筑等行业。已有试验结论表明,分别在连梁和剪力墙中加入钢纤维混凝土,可有效的提高构件的整体刚度、延性和耗能能力,改善构件的承载力和抗裂性能。
本文通过对1片钢筋混凝土双肢剪力墙和2片不同钢纤维体积率的钢筋钢纤维混凝土双肢剪力墙进行低周反复加载试验,研究了钢纤维的加入对钢筋混凝土双肢剪力墙的承载力以及耗能能力的影响。主要研究内容如下：
(1)设计了1片钢筋混凝土双肢剪力墙和2片钢筋钢纤维混凝土双肢剪力墙,并根据试件的尺寸以及受力情况设计制作了相应的试验装置。
(2)对3个构件进行低周反复加载,研究了加载过程中连梁以及墙体的裂缝发展形态和分布。试验结果表明,钢纤维的加入对构件裂缝的分布和发展均产生明显的影响,减小了裂缝的宽度,对剪力墙的抗震性能影响比较显著。
(3)分析了不同钢纤维体积率对双肢剪力墙的承载力、延性、刚度以及耗能能力的影响。通过试验结果分析表明,普通混凝土双肢剪力墙中加入钢纤维,可提高构件整体的承载力、延性以及耗能能力,并且在一定程度上延缓了双肢剪力墙整体的刚度退化。
With excellent carrying capacity and seismic behavior, reinforced concrete shear wall structure is widely used in high-rise buildings. Coupled shear wall structure, a big embranchment of shear wall structure with coupling beams as the link of wall legs, have excellent lateral resisting ability under the earthquake action and the wind load. In high-rise building, in order to guarantee enough lateral stiffness or meet the functional requirements of the building, it often use coupling beam with low span-depth ratio. Existing experimental studies and earthquake disaster show, common reinforcement coupling beam with low span-depth ratio occurs generally shear destruction, thus turn the coupled shear wall into unattached walls and reduce stiffness of the structure extremely.
Steel fiber concrete has got social recognition by its excellent property of ductility and the property of energy absorption and dissipation, and has been widely used in transportation, bridge, and civil engineering. Existing experimental studies show that the steel fiber in the coupling beams and shear walls limit the development of cracks and improve the seismic performance of the structure.
In this paper, three coupled shear walls with different ratio of steel fiber have been tested by low cycle reverse. In order to study the seismic performance of coupled shear walls with steel fiber, this paper mainly completed the following job:
Three coupled shear walls with different ratio of steel fiber were produced. Experimental unit was designed to match the size of the test pieces and fulfills the actual situation,
The horizontal cyclic loading test, distribution and development of concrete crack were recorded in detail, was taken on three coupled shear walls with0.1axial compression ratio. The result showed that steel fiber caused obvious influence on distribution and development of cracks, and a notable one to the earthquake resistant behavior to the structure.
The result of the different steel fiber ratio in the coupled shear walls on the bearing capacity, ductility and the ability of seismic energy dissipation was analyse deeply. And it showed that the bearing capacity, ductility, behavior of dissipation seismic energy and the anti-crack performance of the coupled shear walls was generally improved with the concrete reinforced by steel fibers, the stiffness degeneration was also reduced at a certain degree.
引文
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[2]Roseman, R Approximate. Analysis of Shear Walls Subjected to Lateral Loads[J]. ACI Journal,1964,61 (6)
[3]Coull A and Puri R.D. Analysis of Coupled Shear Walls of Variable Thickness[J]. Building Science, V.2,1967
[4]Paulay T. Coupling Beams of Reinforced Concrete Shear Walls [J]. Journal of Stuctural Division, ASCE, Vol.97.No.ST3, March 1971:843-862
[5]Sozen M.A. Behaviour of Ten-Story RC Walls Subjected to Earthquake Motions [J]. Civil Eng. Studies, University of Illinois, Oct.1976
[6]方鄂华.连系梁对双肢剪力墙弹塑性性能的影响[J].工程抗震,1985,04：5～10
[7]夏晓东.钢筋混凝土有边框带缝槽低剪力墙抗震性能的试验研究和延性设计[D].[博士学位论文].南京：东南大学,1989
[8]夏晓东,丁大钧,程文瀼,蓝宗建.钢筋混凝土带边框低剪力墙抗剪性能分析[J].东南大学学报,1992,02：80～85.
[9]戴航,关国雄,张佑启.带缝钢筋混凝土高剪力墙抗震性能研究[J].东南大学学报,1997,S1：41～46.
[10]戴航,丁大钧,陆勤.带水平短缝剪力墙与普通剪力墙模型的对比振动台试验研究[J].工程力学,1992,02：76～85
[11]Thomas N. Aslonikiosm. Shear Strength and Deformation Partterns of RC walls with Aspect Ratio 1.0 and 1.5 Designed to Eurocode 8 (EC8) [J]. Engineering Strctures 24 (2002):39-49
[12]Thomas N. salonikios, Andreas J. Kappos, Loannis A. Tegos, and Gorgios G Penelis. Cyclic Load Behavior of Low-Slenderness Reinforced Concrete Walls: Failuer Modes, Strength and Deformation Analysis and Design Implications [J]. ACI Structure
[13]曹万林等.带暗支撑抗震墙研究[J].世界地震工程,1998,14(4)：76～80
[14]曹万林等.带暗支撑剪力墙抗震耗能性能试验及计算分析[J].河北工大学学报,2000,29(1)
[15]W.I.Cao, S.D.Xue, J.W.Zhang. Seismic Performance of RC Shear Walls with Concealed Bracing[J]. Advances in structural Engineering vol.6 No.1 2003:1-13
[16]董宏英.带暗支撑双肢剪力墙抗震性能试验及设计理论研究[D].[博士学位论文].北京：北京工业大学,2002
[17]张建伟.带暗支撑剪力墙体系抗震性能及设计理论研究[D].[博士学位论文].北京：北京工业大学,2004
[18]曹征良.双功能钢筋混凝土连梁的试验研究[D].[博士学位论文].南京：南京工学院,1987
[19]曹征良,洪翔.带自控连梁的双肢剪力墙振动台试验研究[J].建筑结构学报,2004,25(3)：51～57
[20]张双记.RC双肢剪力墙结构抗震性能试验研究和RC结构破坏准则及破坏度模糊综合评判[D].[博士学位论文].南京：东南大学,1990.
[21]张双记,丁大钧.钢筋混凝土剪力墙抗震性能试验研究[J].江苏建筑,1992(3)：9～12
[22]高丹盈,赵军,朱海堂.钢纤维混凝土设计与应用[M].北京：中国建筑工业出版社,2002.16～23
[23]高丹盈,刘建秀.钢纤维混凝土基本理论[M].北京：科学文献出版社,1994.1～26
[24]赵国藩,彭少民,黄承逵.钢纤维混凝土结构[M].北京：中国建筑工业出版社.1999
[25]沈荣熹,崔琪,李清海,新型纤维增强水泥基符合材料[M].北京：中国建材工业出版社,2004
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