摘要
为了研究混凝土桥面板收缩徐变效应对三塔结合梁斜拉桥的影响,以武汉二七长江大桥为工程背景,采用桥梁专业软件MIDAS/CIVIL,考虑不同龄期的混凝土板,建立全桥有限元模型,分析了三塔结合梁斜拉桥在收缩徐变影响下挠度及应力的变化。结果表明:混凝土的收缩徐变引起二七长江大桥主跨挠度增加7.6 cm,塔顶水平位移增大5.6 cm,同时也使钢主梁拉应力增加10.9 MPa,混凝土板压应力减小0.6 MPa。混凝土加载龄期越长,对三塔结合梁斜拉桥挠度和应力的影响越小,并在混凝土龄期达到180 d后对斜拉桥的影响趋于稳定。
In order to study the effect of shrinkage and creep of concrete slab on the composite girder cable-stayed bridge with three-tower, taking Erqi Yangtze River Bridge as an example, the finite element mode with the bridge professional software MIDAS/CIVIL is established, considering different ages of concrete slab, the deflection and stress changes of composite girder cable-stayed bridge with three-tower is analyzed under the in-fluence of shrinkage and creep. The analytical results indicate that the deflection of main girders increases 7.6 cm and horizontal displacement of top of the tower increases 5.6 cm, at the same time the shrinkage and creep of concrete lead to an increase by 10.9 MPa in the tensile stress of steel girders and a decrease by O. 6 MPa in the compressive stress of concrete slab. It is further pointed out that the longer concrete age, the smaller the deflection and the stress change are obtained on the composite girder cable-stayed bridge with three- tower, however, this trend becomes stabilized when the age of concrete is up to 180 days.
出处
《华中科技大学学报（城市科学版）》
CAS
2010年第3期6-10,共5页
Journal of Huazhong University of Science and Technology
基金
武汉市建设科技项目(200923)
关键词
钢-混凝土结合梁
收缩徐变
不同加载龄期
挠度
应力
steel-concrete composite girder
shrinkage and creep
different ages
deflection
stress
