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首页> 外文期刊>Bulletin of earthquake engineering >On the seismic response of under-designed caisson foundations
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On the seismic response of under-designed caisson foundations

机译：关于设计不足的沉箱基础的地震响应

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摘要

The seismic behaviour of caisson foundations supporting typical bridge piers is analysed with 3D finite elements, with due consideration to soil and interface nonlinearities. Single-degree-of freedom oscillators of varying mass and height, simulating heavily and lightly loaded bridge piers, founded on similar caissons are studied. Four different combinations of the static (FS_V) and seismic (FS_E) factors of safety are examined: (1) a lightly loaded (FS_V=5) seismically under-designed (FSV < 5) caisson, (2) a lightly loaded seismically over-designed (FS_E > 1) caisson, (3) a heavily loaded (FS_V = 2.5) seismically under-designed (FS_E < 1) caisson and (4) a heavily loaded seismically over-designed caisson. The analysis is performed with use of seismic records appropriately modified so that the effective response periods (due to soil-structure-interaction effects) of the studied systems correspond to the same spectral acceleration, thus allowing their inelastic seismic performance to be compared on a fair basis. Key performance measures of the systems are then contrasted, such as: accelerations, displacements, rotations and settlements. It is shown that the performance of the lightly loaded seismically under-designed caisson is advantageous: not only does it reduce significantly the seismic load to the superstructure, but it also produces minimal residual displacements of the foundation. For heavily loaded foundations, however (FS_V = 2.5), the performance of the two systems (over and under designed) is similar.
机译：考虑到土壤和界面的非线性，使用3D有限元分析了支撑典型桥墩的沉箱基础的抗震性能。研究了基于类似沉箱的重质量和轻度不同，模拟重载和轻载桥墩的单自由度振荡器。检查了静态安全系数（FS_V）和地震安全系数（FS_E）的四种不同组合：（1）轻载（FS_V = 5）地震设计欠佳（FSV <5）的沉箱;（2）轻载在地震之上设计（FS_E> 1）沉箱，（3）地震设计欠佳（FS_E <1）的沉重沉箱（FS_V = 2.5），以及（4）设计过重的地震沉重的沉箱。使用适当修改的地震记录进行分析，以使研究系统的有效响应周期（由于土壤-结构-相互作用效应）对应于相同的光谱加速度，因此可以公平地比较其非弹性地震性能。基础。然后对比了系统的关键性能指标，例如：加速度，位移，旋转和沉降。结果表明，轻载的抗震设计不足的沉箱的性能是有利的：它不仅显着降低了对上部结构的地震荷载，而且还产生了最小的地基残余位移。但是，对于重载的地基（FS_V = 2.5），两个系统的性能（设计上和设计欠佳）相似。

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