摘要
总跨数为偶数的预应力混凝土连续梁桥的合拢特性明显不同于总跨数为奇数的预应力混凝土连续梁桥及相同布置的连续刚构.结合陆家渡大桥对3种不同的合拢工况进行了分析,得出:成桥状态,由中跨向边跨对称逐孔合拢,合拢线形最为平顺,多跨一次合拢轴向变形最小;3种合拢工况下,成桥状态顶、底板应力均为压应力,顶板应力变化幅度较小,底板应力变化幅度较大.随着运营时间的增加,3种合拢工况桥跨线形均有逐渐向下变形的趋势,且其桥跨轴向变形逐渐增大,顶、底板压应力均有减小的趋势.运营10年,3种不同合拢工况,顶、底板应力均为压应力,由中跨向边跨对称逐孔合拢线形最为平顺.整体来看,底板应力变化幅度大于顶板.
Closure characteristics for prestressed concrete continuous beam bridge with even spans are very different from the odd＇s and continuous rigid frame with the same layout. Combined lujiadu bridge,three different closure conditions have been analysed. The results showed that closure alignment from midspan to sidespan is the most smooth, axial deformation is the smallest for multi span closed at the same time. Under three conditions, stress of upper plate and bottom plate are compressive at completed bridge state, stress variation of upper plate is less than that of bottom plate in three conditions. With the increase of operating time, the deflection of bridge and axial deformation of bridge increases gradually, compressive stress of upper plate and bottom plate have a tendency to decrease. 10 years later, upper plate and bottom plate are still in compressive stress in three conditions, closure alignment from midspan to sidespan is the most smooth. Overall, stress variation of bottom plate is greater than that of upper plate.
作者
孟阳君
陈强
MENG Yang-jun CHEN Qiang(College of Architecture ＆ Civil Engineering, Hunan University of Arts and Science, Changde, Hunan 415000, China School of Civil Engineering, Hunan City University, Yiyang, Hunan 413000, China)
出处
《湖南城市学院学报（自然科学版）》
CAS
2017年第3期15-20,共6页
Journal of Hunan City University:Natural Science
基金
湖南省教育厅科研项目(16C1091)
湖南文理学院校级科研项目(E07015017)
关键词
连续梁桥
跨数
合拢
特性
优化
continuous beam bridge
number of spans
closure
characteristics
optimization
