Abstract
Reinforced concrete slabs are common structural parts that may subjected to impact loads plus static loads. Reinforced concrete structures subjected to harsh environments in some time and because of the high corrosion resistance of Fiber Reinforced Polymer (FRP) bars; can used as a substitute for traditional steel. Up to failure, FRP bars behave in a linear-elastic manner without yielding (brittle behavior), which necessitates a solution. Recently, there has been a proposed external bonding of Carbon Fiber Reinforced Polymer (CFRP) sheet on the tension side of the slab to strengthen it. In this study, the number of CFRP sheet layers (one or two) and their configuration (covering the entire surface or only a portion of it) explored. Five (1550×1550×150) mm concrete slabs support all four corners of each one with simple support and reinforced with Glass Fiber Reinforce Polymer (GFRP) bars casted. Four of them externally bonded with CFRP sheets. All slabs tested under impact loads by dropping a 150kg mass from a height of 5m until cracks appeared. Displacement-time, strain-time, reaction force-time, and acceleration-time explored and compared between slabs with various configurations. The results show that increasing the layer number of CFRP on the tension side of the slab develops impact resistance by delaying the appearance of cracks until third blow. In general, slabs with totally bottom CFRP layers provide better performance than other configurations.
Highlights
It has been a growing trend to design some structures to resist both static and dynamic loads
Fiber reinforced polymer (FRP) bar a revolutionary used as alternative of traditional steel reinforcement in civil engineering structures
Sadraie et al (2019) Investigate, dynamic, response of slabs reinforced with steel, and Glass Fiber Reinforce Polymer (GFRP) bar, and applied to impact load with low velocity by using the consequences of experimental work and numerical modeling
Summary
It has been a growing trend to design some structures to resist both static and dynamic loads. Some important studies related to structural behavior of RC slabs with steel bars under drop weight impact loading addressed. Sadraie et al (2019) Investigate, dynamic, response of slabs reinforced with steel, and GFRP bar, and applied to impact load with low velocity by using the consequences of experimental work and numerical modeling. Bar type (steel or GFRP), reinforcement ratio, single or double mesh, compressive strength, and depth of slab used as parameter. Single layer (bottom) of glass-reinforced bar with reinforcement ratio of (0.96%) used in all spacemen .Externally bonded Carbon Fiber sheets used to strength four of the RC slabs, with serving one as a control specimen (CFRP).
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