SRP加固预制节段拼装桥墩在车辆撞击下的动态响应

Dynamic response of SRP-reinforced precast segmental bridge columns subjected to vehicle collision

为了减轻车辆对预制节段拼装桥墩的撞击作用,采用高强钢丝织物复合材料(Steel Reinforced Polymer,SRP)加固预制节段拼装桥墩并进行数值模拟与分析。使用LS-DYNA建立预制节段拼装桥墩受冲击的数值模型,并与已有实验数据对比,验证了该数值模拟方法的准确性。在相同车辆撞击条件下,对比分析了RC墩与SRP加固墩撞击力时程曲线、侧向位移和墩身损坏情况。以SRP加固位置、SRP包裹层数和初始预应力水平为变量,研究其对车辆-桥墩接触面撞击力和桥墩变形的影响规律。研究结果表明:采用SRP对预制节段拼装桥墩进行合理加固,可以有效减小接触面撞击力、墩身位移和桥墩损伤;在桥墩底部及接缝处采用SRP加固对墩身具有更好的保护作用;SRP包裹层数由1层增加到3层可以更好地限制墩身位移变形。

In order to reduce the vehicle impact on the precast segmental columns,the steel reinforced polymer(SRP)was used to reinforce the precast segmental columns and perform intensive numerical simulations.A numerical model of the precast segmental columns was developed using LS-DYNA,and the accuracy of the numerical simulation method was validated comparing with existing experimental data.Under the same vehicle impact conditions,the time-history curves of the impact force,the lateral displacement and the column damage of the RC columns and the SRP reinforced columns were compared and analyzed.The SRP reinforced position,the number of SRP wrapping layers and the initial prestress level were taken as variables,and their influence on the impact force of the vehicle-column collision and the deformation of the columns were studied.The results show that using SRP to rationally strengthen the precast segmental columns can effectively reduce the impact force to the columns.The lateral displacement and damage of the columns are also reduced.The use of SRP reinforcement at the column bottom and the joints has a better protective effect on the columns.Increasing the number of SRP wrapping layers from 1 to 3 can limit the displacement deformation of the columns more effectively.