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Conventional force-based design approach often results in overdesign of reinforced concrete structures subject to impact actions as inertial resistance of the structure is ignored. A displacement-based model is proposed in this paper for estimating the bending response of rigid barriers under boulder impact. The model is in the form of a closed-form expression which allows the flexural deflection of a barrier to be calculated for a given impact scenario. A large-scale horizontal pendulum impact test was carried out to validate the model. The impact test involved the use of two impactors with mass of 280 kg and 435 kg, impacting onto a 1.5 m high reinforced concrete barrier. It has been shown that both the maximum wall deflection and tensile reinforcement strain predicted by the proposed model are in good agreement with the values recorded from the experiment.