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Shear behaviour of fiber-reinforced concrete slabs longitudinally reinforced with high-performance steel

高性能钢纵向增强纤维混凝土板的剪切性能

基本信息

批准号：
411540-2010
负责人：
Lubell, Adam
金额：
$ 2.16万
依托单位：
University of Alberta
依托单位国家：
加拿大
项目类别：
Collaborative Research and Development Grants
财政年份：
2011
资助国家：
加拿大
起止时间：
2011-01-01 至 2012-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=490583
关键词：
Shear behaviour fiber reinforced concrete

项目摘要

There is significant interest in the simplified construction details and improved durability for reinforced concrete that can be achieved by introducing a moderate volume fraction of steel fibers into the concrete matrix. Furthermore, prior research by the applicants has demonstrated the considerable strength increase and reduction in the size effect for shear in thick members that is achieved with the fibers. Complimentary studies at the University of Alberta have also examined the use of high-strength corrosion resistant steel reinforcement as another option to improve constructibility through reduced reinforcement congestion, and to enhance the overall member durability. Both of these so-called high-performance materials show tremendous potential in construction of durable urban infrastructure with low life-cycle costs, including underground structures used for drainage and sewage systems. However, there is no prior work which examines the structural performance of members with combined construction of fiber reinforced concrete and containing high-strength reinforcement. Of special interest is the shear capacity and cracking characteristics of such members, which can often dictate the member design requirements for some infrastructure applications: the shear capacity is known to be influenced by member size, fiber content and reinforcement strains; the crack spacing and crack widths are known to be influenced by fiber content, fiber type and reinforcement configuration.

通过在混凝土基体中引入适量的钢纤维，可以简化钢筋混凝土的结构细节，提高其耐久性，这引起了人们极大的兴趣。此外，申请人的先前研究已经证明，对于厚构件中的剪切，利用纤维实现了相当大的强度增加和尺寸效应的减小。阿尔伯塔大学的补充研究也研究了使用高强度耐腐蚀钢筋作为另一种选择，通过减少钢筋拥挤来改善施工性，并提高整体构件的耐久性。这两种所谓的高性能材料在建造寿命周期成本低的耐用城市基础设施方面显示出巨大的潜力，包括用于排水和污水系统的地下结构。然而，没有先前的工作，检查与纤维增强混凝土和含有高强度钢筋的组合结构的构件的结构性能。特别感兴趣的是这种构件的抗剪承载力和开裂特性，这通常可以决定某些基础设施应用的构件设计要求：已知抗剪承载力受构件尺寸、纤维含量和钢筋应变的影响;已知裂缝间距和裂缝宽度受纤维含量、纤维类型和钢筋配置的影响。