P‐I diagrams are widely used for structures subjected to blast loads. In the same manner, structures subjected to vehicle impact load, such as bridge columns, could potentially take advantages of the P‐I diagram if the dynamic characteristics of vehicle impact load and bridge columns are well considered. In the paper, the performance of bridge columns and hence the use of P‐I diagram is evaluated under vehicle impact load. The main tasks of the paper are (1) to determine the dynamic characteristics of vehicle impact load through finite element method, and three simplified load shapes are obtained including isosceles triangle, right triangle, and rectangular shapes; (2) to investigate structural failure modes under various shear‐bending ratios and impact loads; (3) to establish the damage index based on the residual axial capacity of bridge columns and to obtain P‐I diagrams at different damage levels of bridge columns under vehicle impact load; (4) to parametrically analyze the effects on the impulse asymptotic and the peak load asymptotic of P‐I diagrams, including column diameter, stirrup reinforcement ratio, longitudinal reinforcement ratio, and strength of the concrete. Finally, a simplified calculation method of P‐I diagrams is proposed to evaluate the performance of bridge columns under vehicle impact load.

中文翻译：

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使用P‐I图评估车辆冲击载荷下钢筋混凝土柱的性能

P-I图广泛用于承受爆炸载荷的结构。以同样的方式，如果充分考虑了车辆冲击载荷和桥柱的动态特性，那么承受车辆冲击载荷的结构（例如桥柱）可能会利用P-I图的优势。在本文中，在车辆冲击载荷下评估了桥柱的性能，并因此评估了P-I图的使用。本文的主要任务是：（1）通过有限元方法确定车辆冲击载荷的动力特性，并得到等腰三角形，直角三角形和矩形三种简化的载荷形状；（2）研究在各种剪切弯曲比和冲击载荷下的结构破坏模式；（3）根据桥柱的残余轴向承载力建立损伤指标，并在车辆冲击载荷作用下获得不同损伤水平下桥柱的P‐I图; （4）参数分析P-1图对脉冲渐近和峰值载荷渐近的影响，包括柱直径，箍筋配比，纵向配比和混凝土强度。最后，提出了一种简化的P-I图计算方法，以评估车辆冲击载荷下桥梁柱的性能。纵向钢筋比率和混凝土强度。最后，提出了一种简化的P-I图计算方法，以评估车辆冲击载荷下桥柱的性能。纵向钢筋比率和混凝土强度。最后，提出了一种简化的P-I图计算方法，以评估车辆冲击载荷下桥梁柱的性能。