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工程力学  2014 

基于性能的偏心支撑钢框架抗震设计方法研究

DOI: 10.6052/j.issn.1000-4750.2014.03.0204, PP. 195-204

Keywords: 基于性能的抗震设计,偏心支撑钢框架,失效模式,薄弱层,非弹性变形

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Abstract:

偏心支撑钢框架的理想失效模式为每层耗能连梁均屈服,底层柱脚形成塑性铰,传统设计方法基于强度设计理论,很难保证结构的弹塑性受力状态。该文提出了偏心支撑钢框架基于性能的抗震设计方法(PBSD),该方法以结构的目标侧移和失效模式来预测和控制结构的非弹性变形状态,保证偏心支撑钢框架在大震作用下各层连梁均参与耗能,而其他构件仍保持弹性,即偏心支撑钢框架的层间侧移趋于均匀,避免结构薄弱层的出现,便于偏心支撑钢框架的震后修复。依据PBSD方法分别设计了10层K形和Y形偏心支撑钢框架算例,采用静力推覆分析和非线性时程分析验证该设计方法的合理性,分析结果表明:依据PBSD方法设计的偏心支撑钢框架的极限状态接近于理想整体失效模式,即结构非弹性变形主要集中在耗能连梁中发生,且各层连梁均参与耗能,没有薄弱层出现。该方法为偏心支撑钢框架的工程优化设计提供了参考依据。

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