Numerical simulation of damage and dynamic response of masonry infilled wall under near zone explosion

Under action of explosion load, masonry infilled wall widely used in civil structures can generate fragments to seriously threaten safety of people and equipment inside buildings, especially, under near zone explosion, wall body can cause more serious local damage, and debris can fly faster, but the existing research work is still less. Here, based on near-field explosion tests of ordinary clay fired brick infilled wall, the numerical simulation of damage and dynamic response of masonry infilled wall under near-field explosion was performed. The applicability of the Load Blast method, the arbitrary Lagrange-Eulerian (ALE) method and the impulse method to simulate near-field explosion load and predict wall damage and dynamic response were verified contrastively. The impulse method was used to further discuss effects of explosion distance, bond strength of mortar interface and building block material model under the same proportional distance. The results showed that in near zone explosion, under the same proportional distance, wall body damage usually increases with increase in explosion distance, and develops from local failure to the overall collapse failure mode; the anti-blast performance of wall body is strengthened with increase in bond strength of block mortar, and it is mainly controlled by shear failure stress; the prediction effect of MAT_BRITTLE_DAMAGE model or MAT_WINFRITH_CONCRETE model is better than that of MAT_SOIL_AND_FOAM model. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.