缆索起重机主索垂度与主索及牵引索张力关系

缆索起重机主索垂度的大小会直接影响主索、牵引索、背索、地锚及塔架的受力状况。主索垂度常根据经验取值。相关资料虽提供主索垂度的推荐范围，但未给出分析过程。通过分析主索垂度与主索及牵引索张力关系，使用Matlab软件绘图，显示三者之间关系；经分析得出适当增加主索垂度可以降低缆索起重机成本，为优选主索垂度提供科学依据；通过广西来宾市来华大桥的工程实例验证可行。

The relationship among sag of main cables of cable crane and the tension of main cables and hauling cables

In the design process of cable crane, the influences of sag of main cables on the main cables, hauling cables, anchorage and tower must be taken into account. At present, the value of sag is always determined by experience. Although some references give the recommend ranges of values of sag, they don＇t show the analysis process. This paper analyzes the relationship among sag of main cables, tension of main cables, and tension of hauling cables, then use graphical representation method to display their relationship. The conclusion is that appropriate increasing of the sag of main cables can reduce cost of cable crane, which provide scientific basis for getting optimal value of sag. The feasibility of this analysis is proved, by using the project example of Laihua Bridge in Laibin city, Guangxi Zhuang Autonomous Region.