SBIR Phase I: Concrete-Filled Fiber Reinforced Polymer (FRP) Modular Framing System

这个小型企业创新研究(SBIR)第一阶段项目将开发：填充纤维增强聚合物(FRP)混凝土管(拼接和接头)与其他传统建筑材料之间的连接；具有成本效益的结构框架系统；以及这些结构框架系统的设计辅助工具和规范。与钢管混凝土(CFST)相比，FRP管混凝土(CFFT)的优点包括高强度重量比、耐久性，以及可以优化和设计纤维取向以获得最佳结果。试验表明，CFFTs可以显著提高普通强度混凝土的强度和延性(3-5千磅/平方英寸，极限应变0.003-0.004)，达到高性能混凝土的水平(15-20千磅/平方英寸，0.02-0.04极限应变)。第一阶段将开发分析和实验组件，进行建模、校准和参数研究，并执行有限的概念验证测试。第二阶段将集中制造这些新的系统组件。使用CFFT和其他结构形式的新框架系统预计将用于建筑物和桥梁等民用建筑。与传统系统相比，它将提供更好的抗震性能和更高的抗爆破坏能力，例如在恐怖袭击中。此外，较长的耐久性和耐腐蚀性有望以较低的维护成本延长许多土木结构的设计寿命。

This Small Business Innovation Research (SBIR) Phase I project will develop: connections between concrete-filled fiber reinforced polymer (FRP) tubes (splicing and joints) and with other traditional construction materials; a cost-effective structural framing system; and design aids and specifications for these structural framing systems. The advantages of concrete-filled FRP tubes (CFFT) over concrete-filled steel tubes (CFST) include high strength-to-weight ratio, durability, and the possibility of optimizing and engineering the fiber orientation for best result. Experiments have shown that CFFTs can significantly increase strength and ductility of normal strength concrete (3-5 thousand pounds per square inch (ksi) and 0.003-0.004 ultimate strain) to the level of high-performance concrete (15-20 ksi and 0.02-0.04 ultimate strain). Phase I will develop both analytical and experimental components, conduct modeling, calibration, and parametric studies, and perform limited proof-of-concept testing. Phase II would concentrate on manufacturing these new system components.The new framing system utilizing CFFTs and other structural forms are expected to be used in civil construction such as buildings and bridges. It will offer superior seismic performance and higher resistance to explosion damage, such as in terrorist attacks, in comparison with traditional systems. In addition, long durability and corrosion resistance are expected to extend the designed life span of many civil structures with low maintenance costs.