异型框架结构扭转抗震性能的非线性有限元分析

用有限元程序ANSYS和SAP对异型框架结构扭转抗震性能进行了分析

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利用斜支撑提高异型柱框架结构抗扭性能的研究,
Studies on improving the torsion resistance ability of special shape column frames using inclined supports.

工业建筑. 32(6). 2002. 39-41./Industrial Structure. 32 (6). 2002. 39-41.

摘要:本文采用有限元程序Ansys和SAP,对异型柱框架结构和异型柱加斜支撑结构进行了空间受力分析。单个结构单元的非线性分析说明,在异型柱框架中添加了人字形支撑后,结构的抗扭刚度和抗扭承载力有显著提高,延性也有所提高。通过对异型柱框架结构和矩形柱结构进行地震作用下的对比分析,说明异型柱框架的抗扭性能要远低于等惯性矩的矩形框架结构,而添加斜支撑对提高异型柱框架抗震性能有显著作用。并建议在刚心与质心不一致的异型柱框架结构中,应适当使用斜支撑结构以提高结构抗扭性能。

关键词:异型柱、抗扭、空间受力

Abstract: Spatial analysis of special shape column frames and special shape column frames with inclined supports is carried out in this paper using finite element software, Ansys and SAP. The non-linear analysis of a simply spatial frame shows that the torsion stiffness and strength are improved obviously after inclined supports are added. The ductility of the frame is improved, too. Comparing to that of rectangle column frames, the torsion ability of special shape column frames is much lower under seismic load. However, the inclined supports can improve it effectively. Furthermore, advises are given that when the stiffness center and mass center are not coincident in a special shape column frame, inclined supports should be used to improve the torsion ability of the frame.

Key words: Special shape column, Torsion, Spatial analysis

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