Effects of Near-Fault Ground Shaking on Sliding Systems
| Autor: | Evangelia Garini, Ioannis Anastasopoulos, George Gazetas, Takis Georgarakos |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
geography
business.product_category geography.geographical_feature_category media_common.quotation_subject Fault (geology) Induced seismicity Geotechnical Engineering and Engineering Geology Asymmetry Acceleration Arias Intensity Geotechnical engineering Slippage Inclined plane business Excitation Geology General Environmental Science media_common |
| Zdroj: | Journal of Geotechnical and Geoenvironmental Engineering. 135:1906-1921 |
| ISSN: | 1943-5606 1090-0241 |
| DOI: | 10.1061/(asce)gt.1943-5606.0000174 |
| Popis: | A numerical study is presented for a rigid block supported through a frictional contact surface on a horizontal or an inclined plane, and subjected to horizontal or slope-parallel excitation. The latter is described with idealized pulses and near-fault seismic records strongly influenced by forward-directivity or fling-step effects (from Northridge, Kobe, Kocaeli, Chi-Chi, Aegion). In addition to the well known dependence of the resulting block slippage on variables such as the peak base velocity, the peak base acceleration, and the critical acceleration ratio, our study has consistently and repeatedly revealed a profound sensitivity of both maximum and residual slippage: (1) on the sequence and even the details of the pulses contained in the excitation and (2) on the direction (+ or - ) in which the shaking of the inclined plane is imposed. By contrast, the slippage is not affected to any measurable degree by even the strongest vertical components of the accelerograms. Moreover, the slippage from a specific record may often be poorly correlated with its Arias intensity. These findings may contradict some of the prevailing beliefs that emanate from statistical correlation studies. The upper-bound sliding displacements from near-fault excitations may substantially exceed the values obtained from some of the currently available design charts. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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