CFRP-混凝土-钢管组合结构在低速侧向撞击下的动力响应

采用有限元软件ABAQUS建立了碳纤维增强聚合物（CFRP）-混凝土-钢管组合结构在低速侧向撞击作用下的有限元模型。模型的计算结果与试验结果吻合良好，能够较好地模拟CFRP-混凝土-钢管在侧向撞击下的力学特性。利用该模型，对试件在冲击荷载作用下的动力响应全过程进行分析，采用正交分析法研究了冲击高度、空心率等7种因素对试件冲击力峰值、冲击力平台值和跨中残余挠度的影响。结果表明:冲击高度（冲击能量）是影响冲击力峰值的主要因素；空心率是影响冲击力平台值的主要因素，并且当空心率在0.3~0.7之间时，试件的抗撞击性能随着空心率的提高而逐渐增强；冲击后结构的跨中残余挠度由冲击高度、空心率、CFRP层数、CFRP方向等因素共同影响。

Finite element analysis of CFRP-concrete-steel composite structure under low velocity lateral impact loading

In this study, we set up a finite element model for a carbon fiber reinforced polymer (CFRP)-concrete-steel composite structure under low-velocity impact load using ABAQUS. The analytic results from our model were found to agree well with the test results, thus capable of being used to simulate the mechanical performance of the structure. Using this model, we analyzed all the stages of the dynamic response of the specimen under lateral impact load, and investigated the effects of seven factors, such as impact height and hollow ratio, on the peak value and the platform value of the impact force and the mid-span residual deflection, using orthogonal analysis. We found that the impact height (impact energy) is the main factor influencing the peak value of the impact force; the residual deflection is affected by the interaction of the main factors including the impact height, the hollow ratio, the number of CFRP layers and the direction of CFRP; the main factor of the platform value of the impact force is the hollow ratio, and the anti-impact performance of the specimen gradually increases with the increase of the hollow ratio ranging from 0. 3 to 0. 7.