| 引用本文: | 蔡志恒,童根树.考虑P-Δ效应的弹塑性反应谱归一化[J].哈尔滨工业大学学报,2011,43(6):127.DOI:10.11918/j.issn.0367-6234.2011.06.026 |
| CAI Zhi-heng,TONG Gen-shu.Inelastic spectrum normalization considering P-Δ effects[J].Journal of Harbin Institute of Technology,2011,43(6):127.DOI:10.11918/j.issn.0367-6234.2011.06.026 |
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| 摘要: |
| 为了获得考虑P-Δ效应的强度折减系数R谱和弹塑性动力放大系数β谱,对理想弹塑性(EPP)滞回模型的单自由度体系在地震作用下的响应进行分析,得到不同场地类别、结构自振周期、位移延性、阻尼比和二阶效应的反应谱,并利用2个特征周期Tga和TgR对横轴进行标准化处理.结果表明:周期标准化的R谱和β谱很好地保留了特征周期处的峰值特性,延性、结构周期、二阶效应和阻尼比都对β谱起着显著影响,利用β谱来计算弹塑性地震力,要比采用R来对弹性地震力折减的结果更加理想. |
| 关键词: 理想弹塑性滞回模型 地震力折减系数 动力放大系数 特征周期 二阶效应 |
| DOI：10.11918/j.issn.0367-6234.2011.06.026 |
| 分类号:O344.3 |
| 基金项目:国家自然科学基金资助项目(51078328) |
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| Inelastic spectrum normalization considering P-Δ effects |
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CAI Zhi-heng, TONG Gen-shu
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Department of Civil Engineering,Zhejiang University,310058 Hangzhou,China
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| Abstract: |
| To investigate strength reduction factor R and dynamic magnification factor β,dynamic response of single degree of freedom(SDOF) elastic-perfectly plastic(EPP) hysteretic system are analysed.The influence of site types,natural vibration periods,displacement ductilities,damping ratios and P-Δ effect coefficients are taken into account.The characteristic periods Tga and TgR are used to normalize the R spectra and β spectra.Results indicate that ductility,damping ratio and P-Δ effect coefficient all have obvious effect on R and β.β produces more ideal effect than R on elastic-plastic seismic force calculation. |
| Key words: elastic-perfectly plastic hysteretic model seismic force reduction factor dynamic magnification factor characteristic period P-Δ effect |
