Analysis of damage effects of a prestressed reinforced concrete hollow beam subjected to the synergistic effects of blast and fragments
TIAN Li;LI Yongxin;School of Civil Engineering, Tianjin University;Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University;
Numerical analysis was carried out to research the damage situations of prestressed reinforced concrete hollow beams under the synergistic effects of blast and fragments. Finite element software ANSYS/LS-DYNA was used to simulate the blast test of the prestressed concrete panel and the experiment of explosive driving prefabricated fragments.The reliability of the material constitutive models and technical route used in this paper was verified. The differences in the dynamic response of the hollow beam under the influences of blast wave, fragment load and both of them were analyzed. At the same time, parametric studies were carried out to investigate the effects of tensile control stress, level of stress loss, concrete strength, reinforcement ratio, and spacing of stirrups on dynamic response of the prestressed concrete hollow beam. The results show that with the increase of tensile control stress, the anti-explosion performance of the hollow beam increases. The anti-explosion performance of hollow beam is basically the same at the same tension control stress level, even if there are different levels of stress loss. The improvement of concrete strength on the anti-explosion performance is not significant. The increase of the reinforcement ratio improves the anti-explosion performance of hollow beam slightly within a certain range. With the increase of the spacing of stirrups, the anti-explosion performance of the component weakens obviously.