冲击荷载下钢筋溷凝土结构动力性能研究-__Impact_Response_of_Reinforced_Concrete_Beam.pdf

Impact Response of Reinforced Concrete Beam and Its Analytical Evaluation 1 2 3 Kazunori Fujikake ; Bing Li ; and Sam Soeun Abstract: This paper examines the impact responses of reinforced concrete RC beams through an experimental study and presents an analytical model developed to predict the maximum midspan deflection and maximum impact load, which aids as an important perfor- mance index to evaluate the damage levels of RC beams when subjected to impact loadings. The experimental study involves a drop hammer impact test and investigates the influence of drop height and the effect of the amount of longitudinal steel reinforcement contributes to the response of RC beams. The RC beam specimens used in the experiment comprised of under-reinforced sections provided with sufficient amount of transverse reinforcements to allow for an overall flexural failure. The experimental impact responses of the RC beams were simulated with two-degree-of-freedom mass-spring-damper system model, in which the loading rate effects were duly considered. The analytical results are in good agreement with the experimental results for the RC beams that exhibited overall flexural failure. DOI: 10.1061/ASCEST.1943-541X.0000039 CE Database subject headings: Concrete beams; Reinforced concrete; Impact loads; Loading rates; Deflection; Degrees of freedom. Introduction subjected to impact loading e.g., Hughes and Beeby 1982; Ish- ikawa et al. 2000; Kishi et al. 2001; Yamamoto et al. 2003; Kishi Some reinforced concrete RC structures mu