地震SV波斜入射下沉管隧道的地震响应分析

发布时间：2018-07-08 11:42

本文选题：沉管隧道 + SV波斜入射　；参考：《地震工程学报》2017年04期

【摘要】：在ABAQUS黏弹性人工边界时域波动方法的基础上,首先运用等效应力输入方法实现地震SV波倾斜入射,半空间算例验证该方法具有较好的计算精度,进而基于所建立的斜入射方法研究地震波斜入射对海河沉管隧道地震响应的影响。计算结果表明:SV波斜入射情况下,沉管隧道的地震响应规律与垂直入射时具有明显差异;随入射角增加,沉管隧道结构应力增大,应力较大点出现在沉管隧道的四个角点及隔墙与底板、顶板的连接处,其中中隔墙为最薄弱点;随入射角增加,侧墙和隔墙的相对最大水平位移增大,其中中隔墙位移最大;随入射角增加,沉管隧道结构竖向加速度峰值明显增大。因此在沉管隧道结构抗震设计中应考虑地震波斜入射的影响。
[Abstract]:On the basis of Abaqus viscoelastic artificial boundary time domain wave method, the equivalent stress input method is used to realize the oblique incidence of SV wave. The half-space example shows that the method has good accuracy. Based on the established oblique incidence method, the influence of oblique incidence of seismic waves on seismic response of Haihe immersed tube tunnel is studied. The results show that the seismic response of immersed tunnel is different from that of vertical incident, and the stress of immersed tunnel increases with the increase of incident angle. The larger stress points appear in the four corners of the immersed tunnel and the connection between the partition wall and the floor and the roof, in which the partition wall is the thinnest weakness, and the relative maximum horizontal displacement of the side wall and the partition wall increases with the increase of the incident angle, among which the partition wall displacement is the largest. With the increase of incident angle, the peak value of vertical acceleration of immersed tunnel structure increases obviously. Therefore, the influence of oblique incidence of seismic wave should be considered in seismic design of immersed tunnel structure.
【作者单位】：天津市土木建筑结构防护与加固重点实验室;天津城建大学土木工程学院;
【基金】：国家重点基础研究发展计划(973)项目(2011CB013603) 国家自然科学基金(51678389)
【分类号】：U452.28;U459.5

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