文档介绍：
连续刚构桥加宽连接时机对结构受力影响
研究
王辉,刘伟,石雪飞**
5
10
(同济大学桥梁工程系,上海,200092)
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,得出随着连接时机增长,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:连续刚构桥;加宽;连接时机;收缩徐变
中图分类号:;
15
Continuous rigid frame bridge widening connection timing
of research
WANG Hui, LIU Wei, SHI Xuefei
(Department of Bridge Engineering, Tongji University, Shang hai, 200092)
20
25
30
35
40
Abstract: bination construction of prestressed concrete continuous rigid frame bridge
widening project, the grillage model is employed to study the force performance of bridge
structure with different connection timing. With the connection time growth, whole bending
moment diagram of old bridge shows down trend while that of new bridge shows upward trend,
longitudinal stress of old bridge inclines to downwardness while that of new bridge showed a
trend of increase, the force of the flange joint of new and old box girders shows a trend of
decrease, and bearing reaction of old bridge shows a trend of decrease while new bridge the
opposite,due to the effect of shrinkage and creep. The choice of connection timing has a great
influence on the force performance of the bridge structure, therefore the time joining together
should pre