针对桥面行车所载重型货物意外坠落致桥面板损伤事故，以一座大跨斜拉桥钢 筋混凝土桥面板为研究对象进行落物冲击分析，建立钢筋混凝土桥面板落物冲击安全性 能评价方法． 首先通过与钢筋混凝土板落锤试验结果进行对比来验证数值模拟方法的可 靠性;之后通过非线性有限元分析获得桥面板落物冲击损伤模式，进而分析了钢筋混凝土 桥面板在落物冲击同等加载速率下的极限抗冲击承载力; 最后依据建立的分析方法评价 桥面板安全性能． 结果表明:文中数值分析方法能够满足钢筋混凝土板低速冲击分析精度 的要求;重型货物坠落冲击钢筋混凝土桥面板的破坏机理为压缩应力波背侧发射造成的 局部混凝土开裂，桥面板整体响应不显著;通过蒙塔卡洛随机抽样方法分析了事故桥面板 易损性曲线，给出了事故桥面板在不同冲击强度下发生不同等级损伤的失效概率和可靠 度指标． 

Aiming at the safety performance analysis of the concrete bridge deck subject to falling massive cargo impact，an investigation is performed into an accident of a falling massive cargo onto bridge deck from passing truck in this paper，which happened to a long-span cable-stayed bridge． A performance evaluation procedure for precasting concrete deck under falling cargo impact is established． Firstly，the validity of the finite element method in low-velocity impact analysis is verified by comparing the analysis results with drop weight tests． Afterwards，a series of dynamic numerical simulation using the nonlinear finite element analysis program is conducted to investigate the bearing behavior and response of the ＲC bridge deck under falling cargo impact． Finally，the safety performance of the concrete bridge deck is evaluated by the established procedure． The analytical result indicates that the FEM method used in the analysis is adequate for reinforced concrete component subject low-velocity impact，and that main failure mechanism of the bridge deck is local failure mode，both the local responses are dominating during the collision． Furthermore，the safety performance of ＲC deck is evaluated by a dynamic loading analysis． The probability of each damage level for ＲC deck under different impact scenes is illustrated by vulnerability curves．