本刊于八二、八三年陆续发表的《公路斜张桥设计构思》前四篇中已介绍设计构思的主要内容与变量判别、斜张桥方案拟定与取舍、体系的选择和独塔斜张桥。在本文中首先叙述动力分析的内容及其重要性,再介绍其力学原理,最后提出动力危害现象及设防方法。(续完) The publication published in 1982, 1983, “Highway oblique bridge design concept,” the first four articles have introduced the main content of the design concept and variable identification, diagonal tension bridge program development and choice, the choice of system and single tower tilt Zhang bridge. In this paper, the content and importance of dynamic analysis are described first, and then its mechanics principle is introduced. Finally, the phenomenon of dynamic hazard and the method of fortification are put forward. (Continued)