PSI - Issue 6

Vimal Kumar et al. / Procedia Structural Integrity 6 (2017) 11–18 Author name / Structural Integrity Procedia 00 (2017) 000 – 000

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Fig. 6. Damage in prestressed concrete(PC) slab subjected to multiple impact s.

5. Conclusions Prestressed concrete slabs were designed to reduce the size of structural member to achieve material economy and to control the crack-width up to required level. To study the influence of employed prestress in the concrete, on impact response and damage resistance of concrete slab, impact tests were carried out. Based on the experimentations performed on prestressed and reinforced concrete slabs the following outcomes have been observed.  Under successive impact on a slab, the magnitude of peak impact force was reduced and the magnitude of displacement at center and quarter span has increased.  Peak impact force and energy absorption capacity of prestressed concrete slab were relatively higher than that of the reinforced concrete slab. Under third repeated impact the magnitude of impact force in prestressed concrete slab, PC2, was 56% higher than that measured in reinforced concrete slab, RC3.  The magnitude of peak displacement at the center and quarter span in prestressed concrete slab was relatively smaller than that for reinforced concrete slab.  Under successive impacts the damage, crack density and crack-width at both front and rear surfaces of slab have increased. Prestressed concrete slab had shown relatively lesser cracks due to their higher damage resistance capacity. A c k no w ledgements� Authors gratefully acknowledge the financial support provided by Science and Engineering Research Board, Department of Science and Technology, India through the research Grant no. SB/S3/CEE/0032/2014 for carrying out the present study. R eferences� Bhatti, A. Q., Khatoon, S., Mehmood, A., Dastgir, A., Kishi, N., 2011. Numerical study for impact resistant design of full scale arch type reinforced concrete structures under falling weight impact test. J Vib Control 18, 1275-1283. Delhomme, F., Mommessin, M., Mougin, J. P., Perrotin, P., 2005. Behavior of a structurally dissipating rock-shed: experimental analysis and study of punching effects. Int J Solids Struct 42, 4204 – 4219. Iqbal, M. A., Kumar, V., Mittal, A. K., 2017. Behavior of prestressed and reinforced concrete plates subjected to impact loads induced by free falling indenter. Procedia Eng 173, 397-402. Kishi, N., Konno, H., Ikeda, K., Matsuoka, K. G., 2002. Prototype impact tests on ultimate impact resistance of PC rock-sheds. Int J Impact Eng 27, 969 – 985. Kumar, V., Iqbal, M. A., Mittal, A. K., 2016. Damage induced in reinforced and prestressed concrete plates under drop impact loads. In: Preceedings of The 4th International Conference on Protective Structures (ICPS4). Beijing, China, 307-312. Kumar, V., Iqbal, M. A., Mittal, A. K., 2017. Behavior of prestressed concrete under drop impact loading. Procedia Eng 173, 403-408. Kumar, V., Iqbal, M. A., Mittal, A. K., 2017. Experimental investigation of prestressed and reinforced concrete plates under falling weight impactor. Thin Wall Struct, http://dx.doi.org/10.1016/j.tws.2017.06.028 Mougin, J. P., Perrotin, P., Mommessin, M., Tonnelo, J., Agbossou, A., 2005. Rock fall impact on reinforced concrete slab: an experimental approach. Int J Impact Eng 31, 169 – 183.