Shear Crack Behaviors and Shear Transfer Mechanism of RC Columns with High Strength Materials
高强材料钢筋混凝土柱剪切裂纹行为及剪切传递机制
基本信息
- 批准号:17560499
- 负责人:
- 金额:$ 2.24万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2005
- 资助国家:日本
- 起止时间:2005 至 2006
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The configuration of a crack in a high-strength concrete more than 100 N/mm^2 is much smoother than that in normal-strength concrete. This smooth crack surface may lead different mechanical behaviors of RC members. To study the influence of the configuration of cracks and the confinement of shear reinforcement upon the shear behaviors of RC members, the shear tests were performed on cracked concrete specimens. The confining pressure is automatically applied on crack surfaces by a closed-loop servo system. The test results show that the shear behaviors in cracks are deeply affected by the configuration of cracks as well as reinforcement ratio (confining stiffness). The relations of normal and shear stresses to crack opening and shear displacements have been investigated on the basis of crack surfaces and normal constraints across the cracks.Experiments and 3-D FEM analyses were also performed on high-strength concrete columns laterally prestressed by the shear reinforcements to study the influence of the active confinement upon bond strength, shear strength and crack behaviors. The lateral prestress has been introduced in proportion to the strength of concrete, and the width of every crack over transverse reinforcements has been measured by a microscope. By increasing the lateral pressure as mentioned above, shear crack strength, bond strength and ultimate shear strength have increased significantly, however, the effectiveness of active confinement has been weakened with decreasing axial force ratio. The FEM analyses can evaluate the shear crack strength, bond strength and ultimate shear strength, and explain the effect of the active confinement on shear behaviors by evaluating the intensity of confinement in tri-axial state of stress with minor principal stress and equivalent confining pressure.
在大于100 N/mm^2的高强度混凝土中,裂缝的形态比普通强度混凝土中的裂缝形态平滑得多。这种光滑的裂缝面可能导致不同的钢筋混凝土构件的力学行为。为了研究裂缝形态和抗剪钢筋约束对钢筋混凝土构件抗剪性能的影响,进行了裂缝混凝土试件的抗剪试验。通过闭环伺服系统自动对裂纹面施加围压。试验结果表明,裂缝中的抗剪性能受裂缝形态和配筋率(约束刚度)的影响很大。基于裂缝面和裂缝间法向约束,研究了法向应力和剪应力与裂缝张开度和剪切位移的关系,并通过高强混凝土柱的试验和三维有限元分析,研究了主动约束对高强混凝土柱的粘结强度、抗剪强度和裂缝性能的影响。按混凝土强度的比例施加横向预应力,用显微镜测量横向钢筋上各裂缝的宽度。随着侧压力的增大,抗剪强度、粘结强度和极限抗剪强度均显著提高,但随着轴力比的减小,主动约束的效果减弱。有限元分析可以评估剪切开裂强度、粘结强度和极限抗剪强度,并通过评估小主应力和等效围压三轴应力状态下的约束强度来解释主动约束对剪切性能的影响。
项目成果
期刊论文数量(24)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Effect of Active Confinement on Shear Behavior for High-strength Concrete Columns Prestressed Laterally
主动约束对横向预应力高强混凝土柱抗剪性能的影响
- DOI:
- 发表时间:2007
- 期刊:
- 影响因子:0
- 作者:Yasuji SHINOHARA;Seiman BOKU;Fumito OHYA;Hiroshi WATANABE
- 通讯作者:Hiroshi WATANABE
Influence of Laterally Prestressing on Bond Behavior of Reinforced Concrete Columns
横向预应力对钢筋混凝土柱粘结性能的影响
- DOI:
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:Yasuji SHINOHARA;Hironobu TONOHARA;Hiroshi WATANABE;Shizuo HAYASHI
- 通讯作者:Shizuo HAYASHI
横方向プレストレスを導入した高強度コンクリート柱のせん断挙動に及ぼす能動的拘束効果
侧向预应力高强混凝土柱抗剪性能的主动约束效果
- DOI:
- 发表时间:2007
- 期刊:
- 影响因子:0
- 作者:篠原保二;朴世万;大家史;渡部洋
- 通讯作者:渡部洋
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SHINOHARA Yasuji其他文献
SHINOHARA Yasuji的其他文献
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{{ truncateString('SHINOHARA Yasuji', 18)}}的其他基金
EFFECT OF SMOOTH CRACKS OF ULTRA-HIGH-STRENGTH CONCRETE UPON HYSTERESIS CHARACTERISTICS OF RC COLUMNS
超高强混凝土光滑裂缝对RC柱滞后特性的影响
- 批准号:
19560564 - 财政年份:2007
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Evaluating Shear Stiffness and Crack for Reinforced Concrete Columns under combined states of stress
评估组合应力状态下钢筋混凝土柱的剪切刚度和裂缝
- 批准号:
15560487 - 财政年份:2003
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Effect of Cyclic Loading upon Shear Behavior in Fracture Process Zone of Concrete
循环荷载对混凝土断裂过程区剪切行为的影响
- 批准号:
12650566 - 财政年份:2000
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Shear Behavior in Fracture Process Zone of Concrete
混凝土断裂过程区的剪切行为
- 批准号:
10650557 - 财政年份:1998
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (C)