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Permanent Displacement Response Spectra

Index Back to home page About these web pages Conclusions Slope strength Motion studies Field parameters Compliance Abstract

Normalized PDRS graph.
Absolute PDRS graph.
Permanent Displacement Response Spectra (PDRS) is influenced by the slopes resistance to shear. Weak slopes (low normalized strength, Sn; low normalized yield acceleration, ky/kmax) will yield at very low accelerations and are somewhat less influenced by compliance. Stronger slopes are more influenced by compliance as sympathetic resonance may be needed to induce sliding in soils with a high yield acceleration. Here, on level ground, the absolute displacement is not significantly influenced by the slope strength, but on sloping ground the weak slope displacements tend to be larger.

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