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工程力学  2014 

剪力墙非线性分析单元MFBFE的理论及开发

, PP. 137-145

Keywords: 剪力墙单元,截面剪切变形,单元开发,MFBFE,非线性算法

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Abstract:

纤维单元以其单元自身的优点被广泛使用于梁柱构件的非线性分析中,对于剪力墙构件,由于纤维单元采用平截面假定,忽略单元的截面剪切变形,会造成很大的误差。该文对基于力插值的纤维单元进行修正,将其引入到剪力墙构件的分析中,介绍了考虑截面剪切变形的修正基于力插值纤维单元(MFBFE)和材料单轴本构的形成,给出单元在OpenSees平台上的开发过程,特别是迭代过程中的非线性分析算法和OpenSees框架下单元和材料本构的实现方式。通过实例分析对MFBFE的应用效果进行检验,得到了两组6片剪力墙的水平低周往复模拟数据,与试验结果对比,可以认为试件模拟结果中各项抗震性能指标均与试验值相接近,单元分析精度较高。

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