Abstract
An experimental investigation is conducted to analyze the performance of reinforced high strength concrete (HSC) beams under impact loading. Six reinforced HSC beams with identical dimensions and varying reinforcement ratios and span length are tested using drop-weight impact setup with a 475 kg steel weight from a clear height of 4.15 m. The experimental results have confirmed that beams with a steel reinforcement ratio ranging from 1.2% - 1.8% suffer more damage and shear cracks are more visible and wider compared to beam with a steel reinforcement ratio of 0.5%. Beams with a shear span to effective depth ratio (a/d) of 4.28 sustained more damage and wider shear cracks in comparison to beams with an a/d ratio of 3.21. A static to dynamic load ratio of about 0.5, and a static to dynamic displacement ratio of about 2 may be utilized for estimating the impact behavior of statically flexure beams.
Highlights
1.1 BackgroundThe overwhelming increase in development of infrastructure over the past few decades has led to higher use of reinforced concrete (RC) members in structures due to its wide availability all over the world
Three-point flexural strength tests are conducted on 100×100×400 mm prisms with a clear span of 300 mm and a loading rate of 0.18 mm/min
There is a time lag between the maximum impact force and the maximum reaction force, which is due to the stress wave propagation traveling from the impact zone to the supports
Summary
The overwhelming increase in development of infrastructure over the past few decades has led to higher use of reinforced concrete (RC) members in structures due to its wide availability all over the world Sometimes these structural members such as beams, columns and slabs are subjected to impact loadings caused by objects striking the RC member of the structure. Examples of these loading cases are vehicle impact in parking lots and industrial plants, iceberg impact on offshore marine structures and many more. By having a well-organized experimental program, which would encompass all main design factors influencing the response under impact loading, an insight to performance guideline of RC members under impact loading will be possible to achieve
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