Performance-based framework for evaluating the flexural response of precast concrete wall panels to blast loading

This paper proposes a new performance-based approach to assess the response of precast concrete wall panels to blast loading. Conventional blast-resistant design and analysis methods currently rely on simplified assumptions of component behavior and limit states that are based on visual observations of damage. The proposed methodology allows for the computation of nonlinear moment-rotation resistance functions, component-specific response criteria and deformation-dependent load-mass transformation factors as a function of the panel’s section mechanics and material properties. Computational modeling is used to examine direct correlations between constitutive behavior and critical panel response milestones. These milestones are used as the basis for calculating performance-based limit states, which vary as a function of panel geometry and material properties. Resistance functions and flexural response obtained from the performance-based approach are compared to those calculated via conventional methods and obtained from experimental test data. Comparisons are made between the proposed performance limits and existing response criteria for a set of concrete wall panels under experimental blast loading. Parametric studies were conducted to assess the relationships between performance-based limit states and variations of the panel’s geometric properties and material behavior. The proposed methodology enables improved blast-resistant design of precast concrete wall panels versus the current state-of-practice without significant sacrifices in analytical efficiency.