| 考虑设计地震分组的强度折减系数的研究 |
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| 引用本文： | 翟长海,谢礼立.考虑设计地震分组的强度折减系数的研究[J].地震学报,2006,28(3):284-294. |
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| 作者姓名： | 翟长海 谢礼立 |
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| 作者单位： | 1) 中国哈尔滨150090 哈尔滨工业大学土木工程学院2) 中国哈尔滨150080中国地震局工程力学研究所 |
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| 基金项目： | 国家自然科学基金，黑龙江省自然科学基金 |
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| 摘 要： | 强度折减系数既是基于强度的抗震设计中确定设计地震力的关键因素，又是基于性态的抗震设计理论中确定非弹性反应谱的主要依据. 本文结合我国抗震设计反应谱的形式和特点，应用823条国内外水平向地震动记录（充分利用了我国取得的强震记录），给出了一种考虑设计地震分组和场地类别的强度折减系数模型，研究了结构周期、延性、场地类别、设计地震分组、震级、震中距等因素对强度折减系数的影响. 结果表明:场地条件对强度折减系数的影响是不可忽略的，特别是对延性较大的短周期结构更应注意场地条件的影响；设计地震分组是影响强度折减系数的一个重要因素，在应用我国规范设计反应谱构造非弹性反应谱所用的强度折减系数必须考虑设计分组的影响；震级对强度折减系数的影响较小；如不考虑近场大脉冲地震动记录的影响，震中距对强度折减系数的影响是可以忽略的.
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| 关 键 词： | 强度折减系数 场地类别 设计地震分组 地震动记录 回归分析 |
| 文章编号： | 0253-3782(2006)03-0284-11 |
| 修稿时间： | 2005年5月30日 |
STUDY ON STRENGTH REDUCTION FACTORS CONSIDERING THE EFFECT OF CLASSIFICATION OF DESIGN EARTHQUAKE EFFEC |
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| Zhai Changhai,Xie Lili.STUDY ON STRENGTH REDUCTION FACTORS CONSIDERING THE EFFECT OF CLASSIFICATION OF DESIGN EARTHQUAKE EFFEC[J].Acta Seismologica Sinica,2006,28(3):284-294. |
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| Authors: | Zhai Changhai Xie Lili |
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| Abstract: | The strength reduction factors are not only the key factors in determining seismic action for force-based seismic design, but also the key parameters to derive the inelastic response spectra for performance-based seismic design. With a high quality ground motion database that includes a reasonable-sized set of records from China, a statistical study on the strength reduction factors is conducted and a new expression of strength reduction factors involving classification of design earthquake is proposed, which is an important concept to determine design spectra in seismic design code. The expression of strength reduction factors can reflect the ground motion characteristics of China in a certain extent and is particularly suitable for seismic design in China. Then, the effects of site condition, classification of design earthquake, period of vibration, ductility level, earthquake magnitude and distance to fault on strength reduction factors are investigated. It is concluded that the effect of site condition on the strength reduction factors can not be neglected, especially for the short-period structures of higher ductility. The classification of design earthquake also has an important effect on strength reduction factors and it may be unsuitable to use the existing expressions of strength reduction factors to the design spectra of Chinese seismic code. The earthquake magnitude has no practical effect on strength reduction factors and if the near-fault records with forward directivity effect are not taken into consideration, the effect of distance to fault on strength reduction factors can also be neglected. |
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| Keywords: | strength reduction factor site condition classification of design earthquake strong ground motion regression analysis |
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