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Research on Analysis Method of Mechanical Properties of Modular Steel Frame Based on Multi-Scale and Beam Elements
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摘要: 为探索装配式模块化钢框架结构的整体分析方法和适用性,利用ABAQUS有限元软件建立多尺度有限元模型进行静、动力分析,对比分析了梁单元、实体单元、多尺度节点计算模型的静力特性,并从模块结构的内力分析、模态分析两个方面对比梁单元、实体单元、多尺度框架计算模型的差异性。此外,将多尺度模型应用于模块化钢框架结构中进行动力弹塑性时程分析,对比分析了梁单元与多尺度框架6~12层模型的动力响应差异。分析结果表明:ABAQUS内置多点约束方法能够实现梁单元与实体单元之间连接;多尺度模型与实体单元的计算精度取得较好的一致性,二者相比,多尺度计算模型可增加约40%计算效率;动力模态分析表明,多尺度模型与实体单元振型的固有频率基本一致,验证了采用多尺度模型计算结果的可靠性;当模块结构层数超过10层,梁单元计算模型的计算精度大幅度降低,而多尺度计算模型计算精度呈稳定趋势。Abstract: In order to explore the analysis method and applicability of prefabricated modular steel frame structures, the multi-scale finite element model is established in the ABAQUS finite element software to analyze static and dynamic characteristic. The static characteristic of beam element, solid element and multi-scale joint calculation models are compared and analyzed. The differences of beam element, solid element and multi-scale frame calculation model are compared from two aspects of internal force analysis and model analysis of modular structure. In addition, the multi-scale model is applied to the dynamic elastic-plastic time history analysis of the modular steel frame structure, and the dynamic response differences between the beam element and the multi-scale frame 6 to 12-story model are compared and analyzed. The results show that internal multi-point constraint method in ABAQUS can achieve the connection between beam element and solid element; the calculation accuracy of the multi-scale model is in good agreement with that of the solid element. Comparing the two models, the multi-scale calculation model can increase the calculation efficiency by about 40%; the dynamic modal analysis shows that the natural frequencies of the multi-scale model and the solid element are basically the same, which verifies the reliability of the multi-scale model calculation results; when the number of modular structure floors exceeds 10, the calculation accuracy of the beam element calculation model is greatly reduced, while the calculation accuracy of the multi-scale calculation model is stable.
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Key words:
- modular steel frame /
- beam elements /
- solid elements /
- multi-scale elements /
- interface connection
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