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为了研究装配式钢筋混凝土梁(简称PC梁)的抗冲击力学性能,通过对5根PC梁和1根作为对比的现浇钢筋混凝土梁(简称RC梁)进行落锤冲击试验,研究了不同拼装位置和套筒灌浆料饱满度对PC梁的抗冲击性能影响。详细地分析了各个试件的破坏形态、冲击力、支座反力、跨中位移、整体变形耗能能力等性能。结果表明:1)冲击作用位置,拼装位置以及冲击荷载强度共同影响构件的破坏形态。随着冲击位置远离于构件拼装位置,PC梁破坏形态、接触刚度、整体抗冲击刚度等力学性能均接近于RC梁的力学性能,其抗冲击性能的设计可以参考RC梁进行设计;2)相同强度的冲击荷载作用下,预制试件拼装位置与冲击位置相同时,PC梁破坏形态表现为拼装处严重的局部破坏,刚度退化较大,整体变形耗能不如其他拼装位置的梁以及RC梁,考虑此工况的构件需采取合理的措施,提高其抗冲击能力;3)套筒灌浆饱满度对梁的抗冲击性能有影响较大,其决定PC梁的破坏形态以及刚度;4)拼装位置处交接面的边界条件是影响PC梁抗冲击性能数值分析是否准确的关键因素。
In order to study the impact mechanical properties of prefabricated reinforced concrete beam (referred to as PC beam), the drop-weight impact test of five PC beams and one reinforced concrete beam (RC beam) Influence of location and fullness of sleeve grouting on impact resistance of PC beam. The failure mode, impact force, bearing reaction force, mid-span displacement and overall energy dissipation capacity of each specimen were analyzed in detail. The results show that: 1) the location of impact, assembly location and impact load strength together affect the failure mode of components. The mechanical properties of PC beam such as failure mode, contact stiffness and overall impact rigidity are close to the mechanical properties of RC beams as the impact position is far away from the assembly position of the components. The design of the impact resistance can be designed with reference to the RC beams. 2) The same Under the impact load of the strength, the failure mode of the PC beam shows the serious local damage at the assembling place, the large degeneration of the rigidity, the overall deformation energy loss is not as good as that of other assembled beams and the RC beams, Considering the conditions of the components need to take reasonable measures to improve their impact resistance; 3) The degree of fullness of the sleeve grouting has a great impact on the impact resistance of the beam, which determines the shape and stiffness of the PC beam; 4) The boundary conditions at the interface are the key factors that affect the numerical analysis of PC beam’s impact resistance.