Analysis for Displacement Response Characteristics of Complex Multi-layer Base-Isolated Structure under Near-Field Ground Motion
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摘要: 为了研究近场地震动特征参数对超长复杂基础隔震结构地震位移响应的影响特征. 首先，分析了128条近场地震动特征参数之间的相关性；接着，对超长复杂基础隔震结构输入地震动，分析脉冲型地震动和非脉冲型地震动的特征参数与结构位移响应之间的相关程度及变化特征. 结果表明：隔震结构的长周期值因接近速度谱中速度敏感性区域而远离加速度谱中加速度敏感性区域，使得结构位移响应与地面峰值速度（peak ground velocity，PGV）的相关程度大于与地面峰值加速度（peak ground acceleration，PGA）的相关程度；地面峰值位移（peak ground displacement，PGD）、输入能对较低楼层的层间位移影响程度大于较高楼层层间位移的影响程度，而PGV和PGA对较低楼层的层间位移大小影响程度小于较高楼层层间位移的影响程度；其他特征参数（除输入能和PGV之外）与基础隔震结构层间位移响应的相关程度大小，同该特征参数与地震动特征参数输入能（或PGV）的相关水平程度相一致；除此之外，近场地震作用下，结构端部及边角位置支座相对中心位置支座位移明显偏大，脉冲型地震动对结构层间位移和隔震层位移分别放大56.59%、58.33%，且对较低楼层的层间位移放大作用更加明显.Abstract: In order to study the influence of near-field ground motion characteristic parameters on the seismic displacement response of a super-long complex base-isolated structure, firstly the correlation among 128 near-field ground motion characteristic parameters was analyzed. Then, the near-field ground motions were inputted into the super-long complex base-isolated structure. The correlation degree and variation characteristics between the characteristic parameters of impulsive and non-impulsive ground motions and structural displacement response were analyzed. The results show that the long period of the base-isolated structure is close to the velocity sensitivity range in the velocity spectrum, but far from the acceleration sensitivity range in the acceleration spectrum, such that the displacement response is more correlated with the peak ground velocity (PGV) rather than peak ground acceleration (PGA). The peak ground displacement (PGD) and input energy have greater influence on the inter-story displacement of lower floors than on that of higher floors, while the PGV and PGA have less influence on the inter-story displacement of lower floors than on that of higher floors. The correlation degree between other characteristic parameters and the inter-story displacement response of the base- isolated structure is consistent with the correlation degree between the corresponding characteristic parameters and input energy (or PGV). Under the near-field earthquake, the displacement of the isolation bearing at the end and corner of the structure is obviously larger than that at the center. Impulsive ground motion magnifies the inter-story displacement and isolation layer displacement by 56.59% and 58.33% respectively, and the magnification effect on the inter-story displacement of lower floors is more obvious.
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图 2 部分地震动参数分布
“*”—相关程度显著； “**”—相关程度很高.
Figure 2. Distribution of some ground motion parameters
图 3 层间位移随脉冲型地震动参数变化情况
Figure 3. Change of inter-story displacement with impulse seismic motion parameters
图 4 层间位移随非脉冲型地震动参数变化情况
Figure 4. Change of inter-story displacement with non-impulsive seismic motion parameters
表 1 地震动特征参数之间相关关系
Table 1. Correlation between characteristic parameters of ground motion
地震动参数 地震类型 PGA PGV PGD PGV/PGA PGD/PGA 断层距 TP 持强震时 PGV 脉冲 0.59* 非脉冲 0.58* PGD 脉冲 −0.22 0.51* 非脉冲 0.36* 0.89** PGV/PGA 脉冲 −0.59* 0.27 0.79** 非脉冲 −0.04 0.72** 0.79** PGD/PGA 脉冲 −0.59* 0.18 0.88** 0.91** 非脉冲 −0.04 0.67** 0.89** 0.87** 断层距 脉冲 −0.29 −0.35* −0.13 0.002 0.01 非脉冲 −0.23 −0.09 −0.08 0.09 0.04 TP 脉冲 −0.54* 0.06 0.78** 0.71** 0.87** 0.04 非脉冲 强震持时 脉冲 −0.64** −0.14 0.58* 0.60** 0.60** 0.19 0.66** 非脉冲 −0.19 0.36* 0.55* 0.62** 0.67** 0.07 输入能 脉冲 0.41* 0.83** 0.49* 0.26 0.28 −0.34* 0.16 0.04 非脉冲 0.45* 0.91** 0.89** 0.77** 0.74** −0.04 0.45* 注：上标“*”表示相关程度显著，“**”表示相关程度很高，后表同. 
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表 2 脉冲地震动参数与层间位移相关程度
Table 2. Correlation degree between impulsive ground motion parameters and inter-story displacements
参数 6层 5层 4层 3层 2层 1层 隔震层 平均值 相关性排序 输入能 0.93** 0.94** 0.95** 0.95** 0.95** 0.95** 0.96** 0.95** 1 PGV 0.86** 0.87** 0.86** 0.85** 0.85** 0.84** 0.85** 0.86** 2 PGA 0.56* 0.54* 0.51* 0.47* 0.45* 0.43* 0.43* 0.49* 3 PGD 0.32* 0.34* 0.36* 0.38* 0.40* 0.40* 0.42* 0.38* 4 PGV/PGA 0.11 0.14 0.17 0.21 0.23 0.24 0.25 0.19 6 PGD/PGA 0.07 0.09 0.12 0.15 0.18 0.19 0.21 0.14 7 断层距 −0.36* −0.36* −0.36* −0.36* −0.36* −0.36* −0.35* −0.36* 5 TP −0.01 0.003 0.03 0.06 0.08 0.08 0.10 0.05 9 持时 0.16 0.15 0.12 0.09 0.08 0.07 0.07 0.11 8
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表 3 非脉冲地震动参数与层间位移相关程度
Table 3. Correlation degree between non-impulsive ground motion parameters and inter-story displacements
参数 6层 5层 4层 3层 2层 1层 隔震层 平均值 相关性排序 输入能 0.97** 0.97** 0.97** 0.98** 0.98** 0.98** 0.98** 0.97** 1 PGV 0.89** 0.89** 0.89** 0.88** 0.88** 0.87** 0.87** 0.88** 2 PGA 0.50* 0.49* 0.46* 0.43* 0.41* 0.38* 0.39* 0.44* 6 PGD 0.85** 0.85** 0.86** 0.86** 0.87** 0.87** 0.87** 0.86** 3 PGV/PGA 0.72** 0.73** 0.74** 0.76** 0.77** 0.78** 0.78** 0.75** 4 PGD/PGA 0.67** 0.68** 0.69** 0.71** 0.73** 0.75** 0.74** 0.71** 5 断层距 −0.03 −0.03 −0.03 −0.02 −0.01 0.01 0.02 −0.01 8 持时 0.34* 0.35* 0.37* 0.40* 0.42* 0.43* 0.44* 0.39* 7
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表 4 位移响应结果一致性对比
Table 4. Consistency comparison of displacement responses
地震
类型参数 结构层
间位移输入能 PGV 相关
系数相差值 相关
系数相差值 脉冲 PGA 0.49* 0.41* 0.08 0.60* −0.11 PGD 0.38* 0.49* −0.12 0.51* −0.13 PGV/PGA 0.19 0.26 −0.07 0.27 −0.07 PGD/PGA 0.14 0.28 −0.13 0.18 −0.04 断层距 −0.36* −0.34* −0.02 −0.35* −0.01 TP 0.05 0.16 −0.11 0.06 −0.01 持时 0.11 0.04 0.07 −0.14 0.24 非脉冲 PGA 0.44* 0.45* −0.01 0.58* −0.14 PGD 0.86** 0.89** −0.03 0.89** −0.03 PGV/PGA 0.75** 0.77** −0.02 0.72** 0.03 PGD/PGA 0.71** 0.74** −0.03 0.67** 0.04 断层距 −0.01 −0.04 0.03 −0.09 0.08 持时 0.39* 0.45* −0.06 0.36* 0.03
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