大跨径连续刚构桥高墩设计与稳定性  

Design of high piers and their stability for long-span rigid frame bridges

作　　者：王钧利[1] 贺拴海[1] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2006年第5期35-39,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：国家西部交通建设科技项目(20231822329)

摘　　要：以高墩大跨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置；利用有限单元法，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）、主墩截面设计参数顺桥向宽度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，主墩设置为双肢空心薄壁墩，双肢间距大多在8m以上；高墩可设置1～2道横系梁，增加更多横系梁对桥梁稳定性无益，要综合内力分析来确定系梁个数。The datum for piers design were collected from a large number of long-span rigid frame bridges which have been built. The stability of long-span rigid frame bridges was analyzed by finite element method . The width of the thin-wall pier （b） 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 parameters 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.

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 

分 类 号：U448.2[建筑科学—桥梁与隧道工程]