摘要
碳纤维增强聚合物(CFRP)具有轻质、高强、耐腐蚀、耐疲劳等优良性能,将其用于大跨度斜拉桥中能发挥该材料的性能优势.为研究CFRP索斜拉桥和钢索斜拉桥在地震作用下的动力性能,以某一大跨度斜拉桥为对象,建立有限元计算模型,采用等轴向强度变化的原则将钢索替换为CFRP索,计算并获得二者在同一地震波作用下的最终位移、应力和位移-时程曲线.计算结果表明,与钢索斜拉桥相比,采用碳纤维索后桥梁的变形特征基本接近,但结构的受力状态有所改善,主梁的最大内力和最大位移值均变小.
Carbon fiber reinforced polymer（CFRP）has excellent properties such as light weight,high strength,corrosion resistance,fatigue resistance and so on.It can be used in large span cable-stayed bridge to play the performance advantage of the material.In order to do research about dynamic performance under seismic action of both CFRP cable-stayed bridge and steel cable-stayed bridge,a finite element model of a large-span cable-stayed bridge is built.When the steel is replaced by CFRP,the cables have the same axial strength.Under the same seismic waves,the model is calculated to obtain the final displacement,the stress and displacement-time curve.The results show that compared with steel cable-stayed bridge,deformation characteristics of CFRP cable-bridge is close,but the force state of the structure has been improved.Besides,the maximum value of inner force and the maximum displacement of the beam are smaller.
出处
《武汉理工大学学报（交通科学与工程版）》
2016年第3期462-465,471,共5页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家自然科学基金项目资助(51178361)
关键词
CFRP索斜拉桥
模态分析
地震响应分析
有限元
CFRP cable-stayed bridge
modal analysis
seismic response analysis
finite element method
