Influence of Near-Fault Velocity Pulses on Seismic Responses of Reinforced Concrete Frames

Abstract eng:
Under the condition of the elastic response spectral characteristics being fixed, the engineering properties of near-fault velocity pulse are studied in this paper. Firstly, two sets of ground motion time histories (GMTHs) are constructed, the first set containing the observatory recordings that were recorded during large events and contain distinct velocity pulses, while the second set containing artificial GMTHs that are synthesized numerically to match the target response spectra that are just the spectral accelerations of the GMTHs in the first set. During synthesizing process, by using the narrow-band time history superposition method to control peak velocity, those artificial GMTHs can be constructed not to contain velocity pulses. Secondly, by analyzing the differences between the dynamic responses of reinforced concrete frame excited by these two sets of inputs, the influences of velocity pulse on the seismic responses, especially elastic-plastic seismic responses, of structure are studied with the elastic response spectral characteristics of inputs being consistent. The results show that as to the structural dynamic response parameters, such as the storey shear force, the inter-storey drift, and the maximum storey displacement etc., after the seismic response of structure enters into the elastic-plastic phase, the structural responses increase significantly under the input of ground motion containing velocity pulse, compared with those caused by the input without velocity pulse, despite the fact that the spectral accelerations of the inputs are the same. Therefore, under such circumstance, the response spectrum cannot demonstrate thoroughly the influences of velocity pulse on the structural seismic responses.

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