Influence of Peak Ground Displacement and Peak Ground Velocity of Ground Motion on Dynamic Response of Underground Structures
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摘要: 针对3类不同的典型场地条件下的单层双跨地铁车站结构，采用土-地下结构整体动力时程分析方法，分析了地震动水平输入时峰值位移和峰值速度差异对地下结构地震反应的影响。结果表明，地震动峰值速度差异对地下结构地震反应的影响，在硬土场地条件下较大，中硬场地条件下次之，软土场地条件下最小；地震动峰值位移差异对不同场地条件下的地下结构的地震反应无明显影响。Abstract: In this paper an integral dynamic time history method for soil-structure system is applied to study the dynamic response of a one-story two-span subway station in three typical sites. The influence of peak displacement and peak velocity on the seismic response of the station structure are analyzed through mathematical statistics. The results show that the change of PGV has great effect on the seismic response of underground structures for a hard site, mediate effect for mid-hard site, and minor effect for soft site. The change of PGD has no clear effect on the seismic response of underground structures for different sites.
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图 3 不同场地条件土-结构体系有限元模型
Figure 3. Finite element models of soil-structure system in different sites
图 4 中柱相对位移峰值均值和变异性
Figure 4. The mean value and variability of interior column relative displacement peak
图 5 中柱顶端剪力值均值和变异性
Figure 5. The mean value and variability of shear value at the top of interior column
图 6 中柱顶端弯矩均值和变异性
Figure 6. The mean value and variability of moment value at the top of interior column
图 7 顶板处土层剪力均值和变异性
Figure 7. The mean value and variability of soil shear force at top slab
图 8 底板处土层剪力均值和变异性
Figure 8. The mean value and variability of soil shear force at bottom slab
图 9 侧墙处土层剪力均值和变异性
Figure 9. The mean value and variability of soil shear force at side wall
图 11 中柱位移峰值均值和变异性
Figure 11. The mean value and variability of interior column relative displacement peak
图 12 中柱顶剪力均值和变异性
Figure 12. The mean value and variability of shear value at the top of interior column
图 13 中柱顶弯矩均值和变异性
Figure 13. The mean value and variability of moment value at the top of interior column
图 14 结构顶板处土层剪力均值和变异性
Figure 14. The mean value and variability of soil shear force at top slab
图 15 结构底板处土层剪力均值和变异性
Figure 15. The mean value and variability of soil shear force at bottom slab
图 16 结构侧墙处土层剪力均值和变异性
Figure 16. The mean value and variability of soil shear force at side wall
表 1 场地土层剖面材料
Table 1. Site soil material
典型场地 层号 层厚/m 土层类别 密度/kg·m－3 剪切模量/MPa 剪切波速/m·s－1 金安桥 1 4.0 人工填土 17.0 65.2 194 2 9.0 圆砾卵石1 21.0 481 474 3 10.0 圆砾卵石2 22.0 796.6 596 4 17.0 圆砾卵石3 21.5 815.5 610 珠市口 1 1.6 人工填土 17.5 57.8 180 2 3.5 粉质黏土 19.0 113.4 242 3 6.0 细-中砂 20.0 178.6 296 4 7.4 细-粉砂 20.0 180 159 5 21.5 圆砾卵石 22.8 538.5 480 星海广场 1 5.5 淤泥质土 19.2 25.0 114 2 16.5 淤泥粉质黏土 18.7 47.9 160 3 17.0 粉细砂 19.0 105.8 235 4 21.0 粘土 20.2 126.3 250 
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