下承式钢桁结合梁桥的畸变分析  

Analysis for Distortion of Through Steel-Truss Composite Beam Bridge

作　　者：陈玉骥[1] 罗旗帜[1] 

机构地区：[1]佛山科学技术学院土木工程与建筑系,广东佛山528000

出　　处：《中北大学学报（自然科学版）》2010年第4期404-408,共5页Journal of North University of China(Natural Science Edition)

基　　金：广东省自然科学基金资助项目(915106310100005)

摘　　要：采用对下承式钢桁结合梁桥进行连续化处理的力学模型,考虑结构在畸变荷载作用下的变形特征,给出了结构的变形能.基于能量变分原理推导了下承式钢桁结合梁在畸变荷载作用下的近似解析解.通过一个下承式钢桁结合梁桥算例分析了结构在畸变荷载作用下的受力特性.结果表明:该桥的最大畸变位移约为双线对称活载作用下主桁最大挠度的1/3;主桁的应力水平较低,变化趋势与畸变位移相吻合;混凝土板顺桥向正应力,沿横桥向板端最大,正中为零,应力水平与双线对称活载作用下的相当.According to deformation behavior of the through steeltruss composite beam bridge in the action of the distortion load,the deformation energy of the structure using the mechanic model for the through steel-truss composite beam bridge to be made continuous treatment was given.The approximate solution of the through steel-truss composite beams was taken based on the energy variational principle.The mechanic behavior of the through steel-truss composite beams was analyzed with an example.The results show that the maximum distortion displacement of the bridge is about 1/3 maximum deflection of main truss under live load symmetry in the two-lines;stresses of main trusses are very low and their change trend is consistent with the distortion;stresses of concrete are the greatest at plate end along the transverse direction and zero in the middle of width;the stress level is correspond with that under symmetry live load.

关 键 词：下承式钢桁结合梁 参量变分原理 畸变 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]