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三塔悬索桥是一种新颖的桥梁结构,我国目前已建成泰州长江大桥与马鞍山长江大桥两座三塔悬索桥,但是关于这种桥梁体系的研究才刚刚起步。三塔悬索桥因为多了一个中塔,其静动力特性与普通两塔悬索桥不同,在三塔悬索桥中,中塔的设计是关键,中塔的纵向形式与中塔处的塔梁连接形式对其静动力特性有很大影响,本文以马鞍山大桥为工程背景,研究了三塔悬索桥在主梁挠跨比、主缆抗滑移安全系数、梁端转角、主塔截面内力等设计限制下的中主塔适宜的结构形式,采用有限元方法对中塔纵向采用I型钢塔、I型钢混结合塔、人形钢塔等不同的结构形式进行了静动力分析。研究发现,I形钢混结合塔与人形钢塔结构受力情况较好,研究结论可为同类桥梁的设计提供一定的参考。
The three-tower suspension bridge is a kind of novel bridge structure. At present, two three-tower suspension bridges of Taizhou Yangtze River Bridge and Maanshan Yangtze River Bridge have been built in our country, but the research on such bridge system has just started. As a result of more than one tower in the three-tower suspension bridge, its static and dynamic characteristics are different from that of the ordinary two-tower suspension bridge. In the three-tower suspension bridge, the design of the middle tower is the key. The longitudinal form of the middle tower is connected with the tower girder In this paper, Maanshan Bridge as the engineering background, this paper studies the three-tower suspension bridge in the main span-to-span ratio, the main cable anti-sliding safety factor, the beam end angle, The appropriate structure of the main tower, using finite element method of longitudinal tower using I-type steel tower, I-type steel mixing tower, the human form steel tower and other different forms of static and dynamic analysis. The research shows that the I-shaped steel mixing tower and the human-shaped steel tower structure are in good condition, and the conclusion can provide some reference for the design of similar bridges.