SRP 加固预制节段拼装桥墩在车辆撞击下的动态响应

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。

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

At present, there is no experimental support for the seismic response research of pile-soil-LNG storage tanks. In this paper, shaking table test and numerical simulation method are used to carry out in-depth analysis of the pile-soil-LNG storage tanks.The results of the two methods are similar, and the mutual verification can be realized. The results show that the propagation of seismic waves along soil and pile foundation has amplification effect, and the soil will change the acceleration peak value and spectrum characteristics of ground motion. Under the earthquake action selected in this paper, the site amplification effect of soft soil layer is more obvious. The acceleration response of pile foundation in different positions is different in all directions. The acceleration of pile foundation in the middle position is greater than that of on both sides, and the axial force direction of pile foundation on both sides is opposite. The seismic response of pile-soil storage tank and rigid foundation storage tank is quite different in waveform and peak value. Based on the above research results, it is suggested that the influence of pile soil on LNG storage tanks should be considered when studying the seismic response of LNG storage tanks, and reasonable ground motion should be selected for analysis according to the foundation type.