| 固接抛物线浅拱的平面内稳定性分析 |
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| 引用本文： | 陈耀,冯健.固接抛物线浅拱的平面内稳定性分析[J].东南大学学报(自然科学版),2010,40(1). |
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| 作者姓名： | 陈耀 冯健 |
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| 作者单位： | 1. 东南大学混凝土及预应力混凝土结构教育部重点实验室,南京,210096
2. 东南大学江苏省预应力工程技术研究中心,南京,210096 |
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| 基金项目： | 国家自然科学基金资助项目(50478075) |
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| 摘 要： | 对固接抛物线浅拱的静力及动力稳定性问题进行了研究.基于哈密尔顿原理推导出抛物线浅拱的动力学控制方程,并推得非线性静力平衡方程及静力跃越和分岔屈曲的解析方程;利用体系不稳定平衡时的能量守恒原理确立了发生动力屈曲的临界条件并得到动力屈曲相对荷载上限及下限值.分析结果表明:浅拱的修正长细比及结构已存在荷载是影响浅拱屈曲的重要参数,阶跃荷载作用下浅拱的静力及动力屈曲相对荷载随着长细比的增加而增加,而动力屈曲荷载随结构已存在荷载的增大而减小;当稳定平衡时系统势能大于零,浅拱的动力屈曲荷载将显著提高.
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| 关 键 词： | 抛物线浅拱 阶跃荷载 跃越 动力屈曲 修正长细比 |
In-plane stability of shallow fixed parabolic arches |
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| Chen Yao,Feng Jian.In-plane stability of shallow fixed parabolic arches[J].Journal of Southeast University(Natural Science Edition),2010,40(1). |
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| Authors: | Chen Yao Feng Jian |
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| Institution: | Key Laboratory of Concrete and Prestressed-Concrete Structures of Ministry of Education;Southeast University;Nanjing 210096;China;Engineering Research Center for Prestress of Jiangsu Province;China |
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| Abstract: | In-plane static and dynamic buckling of fixed parabolic arches is concerned.The equations of motion are derived from Hamilton's principle,and the nonlinear equilibrium equations and static buckling equilibrium equations are deduced for shallow parabolic arches.The law of conservation of energy is used along the unstable equilibrium paths to establish the criterion for dynamic buckling of shallow arches,and analytical solutions for the lower and upper dimensionless dynamic buckling loads of arches under the ... |
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| Keywords: | parabolic arch step load snap-through dynamic buckling modified slenderness ratio |
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