【作者】 李杰； 李娜； 郑凯锋；

【Author】 Li Jie~1 Li Na~1 Zheng Kaifeng~2 (1.School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China 2.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

【机构】 郑州大学土木工程学院； 西南交通大学土木工程学院；

【摘要】 相对于斜拉桥、地锚悬索桥等桥型,国内外对自锚式悬索桥抗震分析的研究较少,这主要是由于以前很少建造自锚式悬索桥。自锚式悬索桥的大缆因直接锚固于加劲梁端、大缆可以纵向变形以及较大的矢跨比等特点,使其动力特性和地震响应与其他类型桥梁有一定区别。本文考虑自锚式悬索桥结构特点,通过对已建和在建自锚式悬索桥结构参数归纳分析,提出影响结构地震响应的四个无量纲结构参数,针对常见的混凝土加劲梁自锚式悬索桥,基于非线性静力分析建立几何刚度矩阵,并在恒载作用下建立动力平衡方程进行地震响应分析。通过大量桥梁算例,依据应力和位移的分析,研究这些结构参数对自锚式悬索桥地震响应的影响,得到一系列地震作用下自锚式悬索桥反应的曲线和表格,并得出各参数对自锚式悬索桥地震响应影响的相关规律。更多还原

【Abstract】 Contrast with cable-stayed bridge and ordinary suspension bridge,the research about seismic response of self-anchored suspension bridge is few in overseas and inland.The main reason is that the construction of self-anchored suspension bridge is seldom.Because the character of the self-anchored suspension bridge is longitudinal displacement of cable and ratio of rise to span, its dynamic feature and seismic response are different to other bridges style.Considering structural feature,through summarizing parameter and recently-researched achievement of self-anchored suspension bridge,the paper putts forward four dimensionless parameters which affect seismic response,based on geometric stiffness matrix under static nonlinear analysis,then aims at concrete to introduce dynamic equilibrium equation to analyze seismic response.Through large numbers of bridge examples,according as analysis of stress and displacement,the paper studies on effect of the parameters to seismic response and obtains a series of diagrams and educes some conclusion about parameter to affect seismic response of self-anchored suspension bridge.更多还原