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形心轴附加弯矩对四周布筋混凝土墩柱整体的受力分析

DOI: 10.3969/j.issn.1674-0696.2014.02.03, PP. 10-14

Keywords: 桥梁工程,形心轴附加弯矩,推导,整体刚度,钢筋混凝土墩柱,bridgeengineering,additionalmomentofcenteraxis,wholestiffness,reinforcedconcretepierandcolumn

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Abstract:

:?以基本的力学理论为基础,简化了四周布筋混凝土桥墩的受力模式,推导出墩身截面的力学平衡方程及力矩平衡方程;分析了在受地震作用过程中桥墩墩身开裂截面形心轴的偏移情况;应用形心轴附加弯矩的概念,分析了形心轴附加弯矩产生的原因及其对墩柱受力和整体刚度的影响。研究表明:在一定程度上,形心轴附加弯矩能够抵消墩柱的部分侧向变形,能够抑制截面开裂、减缓刚度退化。建议在结构抗震分析中应考虑形心轴的附加弯矩。

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