Continuous concrete construction with high-performance materials

在混凝土建筑中使用高性能材料，可以通过成本效益高和耐用的材料实现更可持续的建筑实践。与传统钢筋相比，高强度ASTM A1035钢筋和纤维混凝土都具有减少钢筋拥堵的潜力。此外，A1035钢冶金性能的不同使其腐蚀敏感性降低。这些有利的条件使高性能材料成为建筑或桥梁组件的可行选择，这些组件的强度、延展性和耐久性都是主要的设计考虑因素。然而，尽管使用这些高性能材料有潜在的好处，但可用于评估其在常见结构形式下的可行性的现有研究很少。对A1035钢的研究通常集中在简单的跨度结构上，而不是工业上常用的连续多跨或框架构件。关于这种钢结构作为纤维混凝土组合体系的性能，目前只有有限的信息可用。在这两种情况下，A1035钢独特的力学性能可能会显著影响结构性能，包括较高的峰值强度、缺乏屈服平台和改变粘结特性。系统的延性和在地震或其他极端载荷下的性能也是一个令人担忧的问题。 通过配套的实验室测试进行分析建模和验证，将针对使用这些材料的常见构件类型(包括抗弯框架和多跨楼板或梁)在结构性能知识方面的最重要差距。为预测A1035钢加固混凝土构件的局部和整体结构响应，将建立基于力学的分析模型，重点研究塑性铰的“旋转硬化”特性和混凝土/钢组合结构的“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进行地震或其他极端荷载情况的设计。

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.