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Research Projects
Performance Evaluation of FRP Reinforced Concrete Members Using Structural Health Monitoring Techniques
Performance Evaluation of FRP Reinforced Concrete Members Using Structural Health Monitoring Techniques
Corrosion rapidly degrades the performance of steel-reinforced structures. Over the years, a non-metallic class of materials have been developed called fibre reinforced polymers (FRPs), which can be an excellent substitute to steel due to its inherent properties. However, the inelastic behavior (brittle mode) has been one of the biggest problems associated with FRPs. This has led to the restricted use of FRP in structural applications. Structures designed with FRP load-carrying members are constructed with high safety factors to ensure adequate safety for the occupants. However, such high safety factors render the structures uneconomical. The damage tolerant and economical design will require continuous monitoring of FRP reinforced structures to understand the damage evolution process when these structures are subject to static and dynamic loadings. Therefore, this study utilizes Acoustic Emission and Fibre Optic Sensor Technology as potential damage assessment techniques to evaluate the performance of FRP reinforced concrete members.
Principles of AE technology
Experimental Study on Externally Stiffened Built-Up Cold-Formed Steel Beams.
Experimental Study on Externally Stiffened Built-Up Cold-Formed Steel Beams.
Cold-formed steel (CFS) sections when used as primary load-carrying members often require additional strengthening for retrofitting purposes. In some cases, it is also necessary to reduce deflections in order to satisfy serviceability requirements. The introduction of angle sections, screwed to the webs so as to act as external stiffeners, has the potential to both increase flexural strength as well as reduce deflections. This paper presents the results of ten four four-point bending tests, on built built-up CFS sections, both open and closed, with different stiffening arrangements. In the laboratory tests, the stiffening arrangements increased the moment capacity and stiffness of the CFS beams by up to 85% and 100% respectively. The increase in moment capacity was more evident for the open sections, while that reduction in deflection was largest for the closed sections.
Strengthening of RC beams – Approaches and Comparison
Strengthening of RC beams – Approaches and Comparison
Any revision of seismic codes usually demands a higher capacity from structural members, making existing structures unsafe particularly from strength considerations. Retrofitting of capacity deficient members is very suitable for tackling such situations. This paper presents an experimental study on different retrofitting measures adopted for strengthening a series of reinforced concrete (RC) beams. Four identical RC beam specimens were casted, out of which three specimens were strengthened by different schemes (viz., bolted hot rolled flat, bolted cold-formed steel channel, and carbon fibre reinforced polymer (CFRP) laminate, respectively) on their tension face and tested under four-point monotonic loading. This study focuses on the investigation of the flexural behaviour of these retrofitted beams, observed in terms of strength and stiffness. It was concluded that all retrofitting measures improved the structural performance of these beams. However, the cost involved with each strengthening mode was proportional to the improvement in the performance achieved
Any revision of seismic codes usually demands a higher capacity from structural members, making existing structures unsafe particularly from strength considerations. Retrofitting of capacity deficient members is very suitable for tackling such situations. This paper presents an experimental study on different retrofitting measures adopted for strengthening a series of reinforced concrete (RC) beams. Four identical RC beam specimens were casted, out of which three specimens were strengthened by different schemes (viz., bolted hot rolled flat, bolted cold-formed steel channel, and carbon fibre reinforced polymer (CFRP) laminate, respectively) on their tension face and tested under four-point monotonic loading. This study focuses on the investigation of the flexural behaviour of these retrofitted beams, observed in terms of strength and stiffness. It was concluded that all retrofitting measures improved the structural performance of these beams. However, the cost involved with each strengthening mode was proportional to the improvement in the performance achieved
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