The collapse accident of Heyuan Dongjiang Bridge was studied through site investigation, analysis of collapse videos, finite element simulation inversion analysis and other methods. Firstly, photos and videos regarding the collapse site were collected to analyze the possible causes of the collapse. Secondly, the three-dimensional FEM of Heyuan Dongjiang Bridge were established based on the information and videos of the collapse. Thirdly, the collapse process of Heyuan Dongjiang Bridge was inversely analyzed based on the finite element model (FEM); finally, the site data, collapse videos and finite element simulation results were combined to comprehensively analyze the causes for the collapse of Heyuan Dongjiang Bridge. The results showed: the performance degradation of main arch ring’s material and the foundation displacement were the major causes of the collapse of Heyuan Dongjiang Bridge. Accordingly, it was recommended to test and evaluate the performance of the main arch ring materials of deck type arch bridges on service for a long time; and check the displacement of the piers (abutment) in segments of rushing water.

通过现场调查，倒塌录像分析，有限元模拟反演分析等方法研究了河源东江大桥倒塌事故。首先，收集有关倒塌现场的照片和视频，以分析造成倒塌的可能原因。其次，基于倒塌的信息和视频，建立了河源东江大桥的三维有限元。第三，基于有限元模型对河源东江大桥的倒塌过程进行了反分析。最后，结合现场数据，倒塌录像和有限元模拟结果，综合分析了河源东江大桥倒塌的原因。结果表明：主拱环材料的性能下降和基础位移是河源东江大桥倒塌的主要原因。因此，建议长时间使用的甲板型拱桥主要拱环材料的性能进行测试和评估；并检查冲水段中墩台（基台）的位移。