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连续刚构桥加宽连接时机对结构受力影响研究

发表时间:2013-06-30  浏览量:1018  下载量:500
全部作者: 王辉,刘伟,石雪飞
作者单位: 同济大学土木工程学院
摘 要: 结合在建预应力混凝土连续刚构桥横向拓宽工程,采用全桥空间梁格模型研究了不同连接时机对拓宽后桥梁结构受力性能的影响。研究表明:随着连接时机增长,由于收缩徐变等时随作用影响,旧桥整体弯矩图呈下移趋势,新桥弯矩图呈上移趋势;旧桥纵向应力呈减小趋势,新桥纵向应力呈增大趋势;新旧桥箱梁翼缘连接处内力呈减小趋势;旧桥主要支反力呈减小趋势,新桥主要支反力呈增大趋势。连接时机的选取对结构受力有较大影响,拼接时间应由拼接后结构受力性能较好及经济性条件综合确定。
关 键 词: 桥梁与隧道工程;加宽;连接时机;收缩徐变
Title: Research on the effect of widened connection timing on force performance of continuous rigid frame bridge
Author: WANG Hui, LIU Wei, SHI Xuefei
Organization: College of Civil Engineering, Tongji University
Abstract: Based on the widening project of construction prestressed concrete continuous rigid frame bridge, the effect of different connection timing on the force performance of widened bridge structure was studied using grillage model. The results showed that, with the connection time growth, whole bending moment diagram of old bridge presented a down trend, while that of new bridge presented an upward trend. Longitudinal stress of old bridge inclined to downwardness while that of new bridge showed a trend of increase. The force of the flange joint of new and old box girders showed a trend of decrease, and bearing reaction of old bridge showed a trend of decrease while new bridge showed the opposite, due to the effect of shrinkage and creep. The choice of connection timing had a great influence on the force performance of the bridge structure, therefore the time joining together should be comprehensively determined by structural behaviors and economic conditions.
Key words: bridge and tunnel engineering; widening; connection timing; shrinkage and creep
发表期数: 2013年6月第12期
引用格式: 王辉,刘伟,石雪飞. 连续刚构桥加宽连接时机对结构受力影响研究[J]. 中国科技论文在线精品论文,2013,6(12):1136-1140.
 
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