三塔悬索桥桥塔适宜刚度体系研究

发布时间：2018-01-31 11:01

本文关键词： 三塔悬索桥挠跨比抗滑移系数摩擦系数中塔刚度　出处：《土木工程学报》2017年01期 　论文类型：期刊论文

【摘要】：不同塔梁结合情况下的桥塔适宜刚度体系的研究对三塔悬索桥具有重要的意义。以泰州长江公路大桥为依托背景,针对塔梁固结体系、塔梁漂浮体系、塔梁半漂浮体系,通过改变中塔刚度,计算分析了中边塔刚度比、中塔刚度对跨中最大挠度和主缆抗滑移系数的影响。结果表明:主缆与鞍座间的摩擦系数取0.2的情况下,对于塔梁固结和半漂浮体系能够找到同时满足挠跨比限值(1/250~1/300)和抗滑移系数限值(2.0)的合理中塔刚度区间,对于塔梁漂浮体系不能找到同时满足挠跨比限值和抗滑移系数限值的合理中塔刚度区间。中边塔的刚度比不能有效反映桥塔刚度体系对跨中最大挠度和主缆抗滑移系数的影响,中塔的绝对刚度是二者的主要影响因素。适当地提高主缆与鞍座间的摩擦系数的取值能够增加中塔刚度的选择范围,具有较高的经济性和实用价值,建议三塔悬索桥中主缆与鞍座间的摩擦系数选取值可以放宽到0.25~0.3之间。
[Abstract]:The study on the suitable stiffness system of the tower under different combination of tower and beam is of great significance to the three-tower suspension bridge. Based on the Taizhou Yangtze River Highway Bridge, the tower and beam system are combined and floating. By changing the stiffness of the middle tower, the ratio of the column stiffness to that of the middle side tower is calculated and analyzed. The effect of the stiffness of the middle tower on the maximum deflection of the span and the slip resistance coefficient of the main cable is obtained. The results show that the friction coefficient between the main cable and the saddle is 0.2. For the tower beam consolidation and semi-floating system, a reasonable mid-tower stiffness range can be found, which can satisfy the limit of 1 / 250 / 300 of the ratio of deflection to span and the limit value of anti-slip coefficient of 2.0) at the same time. For tower beam floating system, a reasonable middle tower stiffness interval can not be found which can satisfy both the limit value of deflection span ratio and the limit value of anti-slip coefficient. The stiffness ratio of the middle side tower can not effectively reflect the maximum deflection of the tower stiffness system to the middle span of the bridge tower and the skid resistance of the main cable. The effect of the shift coefficient. The absolute stiffness of the middle tower is the main influence factor of the two. It is of high economic and practical value to increase the friction coefficient between the main cable and the saddle to increase the selection range of the stiffness of the middle tower. It is suggested that the selection value of friction coefficient between main cable and saddle of three-tower suspension bridge can be relaxed to 0.250.3.
【作者单位】：北京交通大学;交通运输部公路科学研究院;
【基金】：“十一五”国家科技支撑计划(2009BAG15B01)
【分类号】：U448.25
【正文快照】： 引言三塔悬索桥具有充分减小主跨跨径、改善主缆拉力和降低锚碇规模等优势,进而降低综合造价,在大跨度桥梁跨江海工程中竞争力非常显著[1]。世界各国在多塔悬索桥的建设及理论研究上做了大量的探索和实践,并建成了一系列中小跨度的此类桥梁[2-3]。在中国,先后建成了两座大型三

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