Continuous concrete construction with high-performance materials

采用高性能材料的连续混凝土施工

• 批准号: 326973-2012
• 负责人: Lubell, Adam
• 金额: $ 1.38万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=571884
• 关键词: Continuous; concrete; construction; performance; materials

The use of high-performance materials for concrete construction enables more sustainable construction practices through cost effective and durable materials. High-strength ASTM A1035 steel reinforcement and fibre-reinforced concrete both offer the potential for reduced reinforcement congestion compared to traditional reinforcing steels. Moreover, differences in the metallurgy of A1035 steel give it reduced corrosion susceptibility. These favourable conditions make high-performance materials viable options for construction of building or bridge components where strength, ductility and durability are all primary design considerations. However, despite the potential benefits of using these high-performance materials, available research to assess their viability in common structural forms is scarce. Research with A1035 steel has typically focused on simple span construction rather than the continuous multi-span or frame members commonly used in industry. Only limited information is available on performance of this steel as a composite system with fiber-reinforced concrete. In both cases the structural performance may be significantly impacted by the unique mechanical properties of A1035 steel including its higher peak strength, lack of yield plateau, and altered bond characteristics. System ductility and performance under seismic or other extreme loading is also a concern. Analytical modeling with validation through companion laboratory testing will be used to target the most important gaps in knowledge of structural behaviour for common member types using these materials, including moment resisting frames and multi-span slabs or beams. Mechanics-based analytical models will be developed for predicting the local and global structural response of concrete members reinforced with A1035 steel with specific focus on the 'rotation hardening' characteristics of plastic hinges and the 'tension stiffening' characteristics of the composite concrete/steel configuration. A new deformation-based pushover design approach will be established for these structural configurations to enable design for seismic or other extreme loading cases in a manner that can also be extended to consider other reinforcement types.

在混凝土施工中使用高性能材料，通过具有成本效益和耐用的材料实现了更可持续的施工实践。与传统钢筋相比，高强度ASTM A1035钢筋和纤维增强混凝土都具有减少钢筋堵塞的潜力。此外，A1035钢的冶金差异使其腐蚀敏感性降低。这些有利条件使高性能材料成为建筑或桥梁构件的可行选择，其中强度，延展性和耐久性都是主要设计考虑因素。然而，尽管使用这些高性能材料的潜在好处，现有的研究，以评估其在常见的结构形式的可行性是稀缺的。A1035钢的研究通常集中在简单的跨度结构上，而不是工业中常用的连续多跨或框架构件。只有有限的信息是关于这种钢作为一个复合系统与纤维增强混凝土的性能。在这两种情况下，结构性能可能会受到A1035钢独特机械性能的显著影响，包括其较高的峰值强度、缺乏屈服平台和改变的粘结特性。系统在地震或其他极端载荷下的延性和性能也是一个问题。 通过伴随实验室测试进行验证的分析建模将用于针对使用这些材料的常见构件类型的结构行为知识中最重要的差距，包括抗弯框架和多跨板或梁。将开发基于力学的分析模型，用于预测A1035钢加固混凝土构件的局部和整体结构响应，重点关注塑性铰的“旋转硬化”特性和复合混凝土/钢配置的“拉伸硬化”特性。将为这些结构配置建立一种新的基于变形的推覆设计方法，以便能够以一种也可以扩展到考虑其他钢筋类型的方式设计地震或其他极端荷载情况。