NUMERICAL STUDY OF THE INFLUENCES OF PRESTRESS LEVELS ON RESPONSES OF RC BEAMS TO BLAST LOADS

摘要

Intensive researches on responses and damage of reinforced concrete beams subjected to blast loadings have been reported in the literature.These researches include studying the influences of different reinforcement ratios,reinforcement strength and concrete strength on RC beam blast loading resistance capacities.Despite a large number of RC structures are constructed with prestressed reinforcement,very limited studies of the responses of prestressed RC beams to blast loadings can be found in the literature.This paper studies the influences of prestressing levels of RC beams on blast loading resistance capacities.A computer model is developed with commercial code LS-DYNA to calculate the RC beam responses to blast loads.The reliability of the model is calibrated with blasting test results.The verified model is used to perform intensive numerical simulations of responses of RC beams with prestressed reinforcements at different prestressing levels to blast loads.The numerical simulations are compared and analyzed.The influences of prestressing levels of RC beams on blast loading resistance capacities are demonstrated.