大跨径连续刚构桥高墩设计与稳定性

第 26卷第 5期 2006年 9月

长安大学学报(自然科学版)

Vo l. 26

Journal of Chang'an University(Natural Science Edition)

NO.5 Sept. 2006

文章编号:

1671-8879 (2006) 05-0035-05

大跨径连续刚构桥高墩设计与稳定性 王钧利，贺拴海 (长安大学桥梁与隧道陕西省重点实验室，陕西西安 710064)

摘

要:以高墩大垮连续刚构桥为研究对象，收集大量已建桥梁主墩的设计类型、截面参数和系梁

的设直;利用有限羊元法，对典型桥梁主墩在不同的设计参数下的内力和稳定性进行计算分析;将 其结果进行比较，归纳出高墩大跨径刚构桥主墩类型(独墩或双肢墩)、主墩截面设计参数}I顶桥向宽

度 b的确定、在主梁悬臂施工中产生的不平衡弯矩所需双薄壁墩的间距 H和系梁个数与结构稳定性的规律。结果表明:主墩长细比是稳定性的敏感参数;大跨径时，主墩设直为双肢空心薄壁墩， 双肢间距大多在 8m以上;高墩可设直 1~2道横系梁，增加更多横系梁对桥梁稳定性元益，要综合内力分析来确定系梁个数。

关键词:桥梁工程;大跨径连续刚构桥;主墩设计;悬臂施工;稳定性 中图分类号: U448. 2文献标识码:A

Design of high piers and their stability for long-span rigid frame bridges WANG Jun-li, HE Shuan-hai CKey Laboratory for Bridge and Tunnel of Shaanxi Province, Chang'an University, Xi'an 710064,

Shaanxi, China)

Abstract: The datum for piers design were collected from a large number of long-span rigid frame bridges which have be巳n

built. The stability of long-span rigid frame bridges was analyzed by fi-

nite element method. The width of the thin-wall pier (的 in flat direction was also deduced to satisfy the flexibility; the spacing of the double thin-wall piers (H) derived from unbalanced moment in construction was also deduced. The relation of the stability coefficient to the design pa rameters of piers and the number of tie-girders were summarized. The results indicated that the types of piers and their design parameters and the number of tie-girders vary with the span and the height of piers; the slenderness ratio of pier dominated the critical stability coefficient; the spacing of the double thin-wall piers (H) is large than 8 m; the number of tie-girders is not more than 2, which must be colligated from the views of the stress and stability. 5 tabs, 4 figs, 7 refs. Key words: bridge engineering; long-span rigid frame bridge; high piers design; cantilever construction; stability 。 悬臂施工，有利于跨越深沟、大河及其他交通线路， 并能满足横向抗风要求;连续刚构桥主墩与主梁固

引

-

,一 F司

连续刚构桥纵向和横向都具有较大刚度，适合 收稿日期:2005-09-15

结，无支座、桥面连续、行车平顺。因此，连续刚构桥

基金项目:国家西部交通建设科技项目 (20231822329) 作者简介:

王钧利 0964-),男，陕西凤翔人，教授，博士.

第1页下一页