000010314 001__ 10314 000010314 005__ 20141205155714.0 000010314 04107 $$aeng 000010314 046__ $$k2008-10-12 000010314 100__ $$aIervolino, Iunio 000010314 24500 $$aConditional Pulse Probability for Near-Source Hazard Analysis 000010314 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering 000010314 260__ $$b 000010314 506__ $$arestricted 000010314 520__ $$2eng$$aNear-source ground motion records affected by “directivity” may show unusual features resulting in low frequency pulses in the velocity time-history, especially in the fault-normal component. Although not all near-source recordings show pulses, such an effect is of particular interest for practitioners as it may cause the seismic demand for structures to deviate from that of, so-called, “ordinary” records. Consequently many seismology and earthquake engineering researchers have tried to parameterize the causes and the effects of directivity pulses. In the framework of the probabilistic seismic assessment of structures in near-source conditions, a quantification of the pulse threat is required. In fact, the recently developed probabilistic seismic hazard analysis for near-source sites requires a probabilistic model for the occurrence of pulses in ground motion. Herein this issue is investigated and models are obtained via logistic regression of a set of pulse-like records from the NGA database. Analyses are limited to ground motions recorded within 30km from the source and to strike-slip events. Occurrence probability of velocity pulses is computed as conditional in respect to those factors considered by seismologists to affect the amplitude of directivity effects. 000010314 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb. 000010314 653__ $$anear source, directivity, velocity pulses, PSHA, strike-slip events. 000010314 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15 000010314 720__ $$aIervolino, Iunio$$iCornell, C. Allin 000010314 8560_ $$ffischerc@itam.cas.cz 000010314 8564_ $$s291498$$uhttps://invenio.itam.cas.cz/record/10314/files/07-0045.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 07-0045. 000010314 962__ $$r9324 000010314 980__ $$aPAPER