随着桥梁建设的发展，传统横道图与网络图已成为施工管理水平提高的制约因素。将面向对象的复杂工程系统仿真方法与CAD数字建模方法相结合，将桥梁的3D整体模型和施工进度相链接，提出了基于4D CAD的桥梁施工系统仿真思想，使施工过程的动态可视化与直观分析优化后的施工进度成为可能。以Visual C++作为仿真平台，设计编制了桥梁施工4D CAD可视化仿真软件。研究成果在某斜拉桥工程施工组织设计中得到成功应用，验证了基于4D CAD的大型桥梁可视化仿真方法在斜拉桥施工进度分析与优化方面的实用性和优越性。

With the development of bridge construction, none of the traditional approaches, i. e. bar chart and network diagrams, etc. , has the capabilities to match the development of construction management. Combined the object-oriented system simulation technology for complex engineering system with the CAD digital modeling technology, the system simulation of bridge construction based upon 4D CAD was presented, which linked a 3D model of a construction project with a project activity schedule element. The dynamic visualization of construction process and intuitive analysis on the optimization of construction schemes were achieved. And the corresponding software of visualization simulating system, based on 4D CAD, for construction of bridges was programmed with visual C++. The successful application of the software to the practical cable-stayed bridge showed the practicality and preponderance of this method.