摘要
为改善节段预制拼装连续刚构桥的成桥内力状态,以南京四桥南引桥某一联4×50m连续刚构(先简支后连续)为背景,采用有限元法分析4跨同步合龙法,逐跨推进合龙法,先两边、后中间合龙法,前后半联二次合龙法的成桥内力。分析结果表明:先两边、后中间合龙方案桥墩弯矩值更均匀,中跨、边跨最大弯矩的比值比较接近,梁体弯矩的均匀程度相当,临时支座反力效果较好,确定该桥采用先两边、后中间方案合龙。
To improve the internal force condition of continuous rigid-frame bridges that are constructed by segmental prefabrication and assembly, a unit of 4 5（ 50 m continuous rigid-frame structure of the south approach of the Fourth Nanjing Changjiang River Bridge, which took shape by transforming from a simply supported structure to a continuous structure, was taken as the study background. The finite element method was used to analyze the internal forces in the com- pleted bridge state when the structure were to be closed by the proposed closing schemes, inclu- ding the parallel closing of the four spans, span-by-span closing method, the method of closing the side spans first and the intermediate spans later and the method of closing the half of both the front and rear units first and then closing the whole continuous unit. The results of the analysis indica- ted that when the method of closing the side spans first and the intermediate spans later was used, the bending moments of the piers were more uniform, the bending moments in the intermediate spans and the side spans were proximate, the uniformity of the bending moments in the beams were equal, and the temporary bearings had good reaction forces. Therefore, the closing scheme of closing the side spans first and the intermediate spans later was chosen for the bridge.
出处
《世界桥梁》
北大核心
2013年第5期72-75,共4页
World Bridges
关键词
连续刚构桥
预制节段
先简支后连续
合龙方案
成桥内力
有限元法
continuous rigid-frame bridge
supported structure to a continuous structure
bridge state
finite element methodprefabricated segment
transforming from a simply closure scheme
internal force in the completed
作者简介
程钢（1969一），男，高级工程师，1990年毕业于南京航务工程专科学校公路桥梁工程专业，2003年毕业于江苏广播电视大学工程管理专业（E—mail：cg@iscd．gov．cn）。
