摘要
为研究填充混凝土对组合桁架连续刚构桥力学性能的影响,以一座部分填充混凝土矩形钢管组合桁架连续刚构桥为工程实例,利用大型通用有限元软件ANSYS建立其空间三维有限元模型,计算了桥梁恒载作用下主桁挠度、弦杆轴力与应力等静力响应与自振频率、振型等动力特性,对比分析了填充混凝土对其静动力性能的影响。研究结果表明,部分填充混凝土能有效减小桥梁挠度、降低弦杆轴力和应力、增强连续刚构桥的竖向整体刚度、提高桥梁结构的竖向弯曲自振频率,但桥梁振型特征不变。
In order to study the influence of filled concrete on the mechanical properties of composite truss continuous rigid frame bridge, taking a vehicular bridge as an engineering example, which is composite truss continuous rigid frame bridge with partially concrete-filled rectangular steel tube, the 3D spatial finite element models are established by ANSYS software. The static responses of the bridge under dead load and dynamic characteristics of the bridge are calculated, the influence of filled concrete on mechanical behaviors of vehicular bridge are compared and analyzed. The results show that partially filled concrete can effectively reduce the deflection of bridge, reduce the axial force and stress of chords, improve the stiffness of continuous rigid frame bridge, and improve the natural frequency of bridge structure, but the vibration mode characteristics of bridge remain unchanged.
作者
弓晓丽
张循当
刘世忠
GONG Xiaoli;ZHANG Xundang;LIU Shizhong(l.Shanxi Construction Investment Group Co.,Ltd.,Taiyuan,Shanxi 030002,Chin;School of Transportation and Logistics Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi 030024,China)
出处
《施工技术》
CAS
2018年第15期143-147,共5页
Construction Technology
关键词
桥梁工程
混凝土
钢管
组合桁架
连续刚构桥
力学性能
有限元分析
bridges
concrete
steel tube
composite truss
continuous rigid frame
mechanics behavior
finite element analysis
