Failure assessment of concrete shear walls under close-in blast based on viscous damage model

• Published in: Engineering failure analysis Vol. 156; p. 107858
• Main Authors: Wei, Xiaoli, Ren, Xiaodan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2024
• Subjects: Blast loads; Concrete shear walls; Dynamic damage; Numerical simulations; Residual bearing capacity; Residual bearing capacity; Concrete shear walls; Numerical simulations; Dynamic damage; Blast loads
• ISSN: 1350-6307; 1873-1961
• DOI: 10.1016/j.engfailanal.2023.107858

In this research, failure of reinforced concrete shear walls under close-in blast is evaluated based on numerical analysis. By introducing the Duvaut–Lions type damage driving stress rate, a dynamic viscous damage evolution law for concrete materials is constructed under the framework of elastoplastic damage theory. The rate effect-induced increase in concrete strength is well captured by the suggested model. For validation, the response of reinforced concrete slabs in blast tests and their mechanical behaviors after explosion were calculated, and the results are in good agreement with the experimental findings. Under blast loads at various scaled distances, the failure of a series of reinforced concrete shear walls with different axial load ratios is simulated, and the post-blast residual bearing capacity is calculated using a three-step loading analysis process. The ratio of the residual axial strength is defined to assess the performance degradation of the shear walls after blast, and the effect of different factors on the failure of structures under blast is examined. •Failure of reinforced concrete shear walls under close-in blast is analyzed.•A dynamic damage constitutive model for concrete is built to reflect rate effect.•Simulation for reinforced concrete slabs subjected to blast agrees well with test.•Post-blast residual bearing capacity of concrete shear walls is investigated.