Abstract

A structure may show sign of deterioration earlier than its design life due to poor designing, change in the occupancy of the structure and the damage caused by abnormal and accidental loading. In order to avoid economic loss, the structural elements i.e. beams, slabs, columns are usually retrofitted and/or strengthened such that they can withstand the applied load during their operational life. Among many strengthening techniques used, use of high strength technical textiles, more commonly referred as fiber reinforced polymers (Carbon, Glass, Aramid, Kevlar, etc.) have proved to be beneficial in improving the overall performance of the ageing and damaged structural elements. Therefore, in this investigation, aim was to study the behaviour of the reinforced concrete beams and columns externally wrapped with carbon fiber reinforced polymers (CFRP) fabrics under static loading. For this purpose, different types of wrapping techniques were adopted to strengthen reinforced concrete (RC) columns and beams with CFRP wraps. The uniaxial compression tests were carried out on the columns investigated, whereas, four-point loading setup was used for the RC beams. Based on the detailed investigation, it was observed that the use of CFRP wraps proved to be significantly beneficial in improving the overall performance of beams and columns, as load carrying capacity, ductility and stiffness exhibited by CFRP wrapped specimens were found to be higher when compared with identical specimens without CFRP wraps.

摘要

由于设计不当、结构占用率的变化以及异常和意外加载造成的损坏，结构可能在其设计寿命之前出现劣化迹象。为了避免经济损失，通常对结构元件，即梁、板、柱进行改造和/或加固，以使它们能够在其使用寿命期间承受所施加的载荷。在使用的许多增强技术中，使用高强度技术纺织品，通常称为纤维增强聚合物（碳、玻璃、芳纶、凯夫拉尔等）已被证明有利于改善老化和受损结构元件的整体性能。因此，在本次调查中，目的是研究外包裹碳纤维增强聚合物（CFRP）织物的钢筋混凝土梁和柱在静载荷下的行为。为此，采用不同类型的包裹技术来加强钢筋混凝土 (RC) 柱和梁的 CFRP 包裹。对所研究的柱进行了单轴压缩试验，而对 RC 梁使用了四点加载设置。根据详细调查，发现使用 CFRP 包裹物被证明在提高梁和柱的整体性能方面非常有益，因为 CFRP 包裹试件的承载能力、延展性和刚度被发现在比较时更高相同的样本没有 CFRP 包裹。采用不同类型的包裹技术来加强钢筋混凝土 (RC) 柱和梁的 CFRP 包裹。对所研究的柱进行了单轴压缩试验，而对 RC 梁使用了四点加载设置。根据详细调查，发现使用 CFRP 包裹物被证明在提高梁和柱的整体性能方面非常有益，因为 CFRP 包裹试件的承载能力、延展性和刚度被发现在比较时更高相同的样本没有 CFRP 包裹。采用不同类型的包裹技术来加强钢筋混凝土 (RC) 柱和梁的 CFRP 包裹。对所研究的柱进行了单轴压缩试验，而对 RC 梁使用了四点加载设置。根据详细调查，发现使用 CFRP 包裹物被证明在提高梁和柱的整体性能方面非常有益，因为 CFRP 包裹试件的承载能力、延展性和刚度被发现在比较时更高相同的样本没有 CFRP 包裹。