Selection of earthquake ground motions is considered with the goal of accurately estimating the response of a structure at a speci ed ground motion intensity, as measured by spectral acceleration at the rstmode period of the structure, Sa(T1). Consideration is given to the magnitude, distance and epsilon ( ) values of ground motions. First, it is seen that selecting records based on their value...

The study of the Earth’s electromagnetic fields prior to the occurrence of strong seismic events has repeatedly revealed cases were transient anomalies, often deemed as possible earthquake precursors, were observed on electromagnetic field recordings of surface, atmosphere and near space carried out measurements. In an attempt to understand the nature of such signals several models have been pr...

Classical dynamic fracture theories predict the surface wave speed to be the limiting speed for propagation of in-plane cracks in homogeneous, linear elastic materials subjected to remote loading. This report presents experimental evidence to the contrary. Intersonic shear-dominated crack growth featuring shear shock waves was observed along weak planes in a brittle polyester resin under far-fi...

Department of Cardiac, Thoracic and Vascular Sciences, University of Padua, Padua, Italy; Department of Internal Medicine, Samara State Medical University, Samara, Russian Federation, Russia; Hammersmith Hospital, Imperial College NHS Trust, London, UK; Cardiologie–CHU Rennes et LTSI INSERM 1099–Université Rennes-1, France; Departments of Cardiology, University of Liège Hospital, GIGA Cardiovas...

An application is presented of a recently proposed system identification method for buildings that takes into account the effects of soil-structure interaction and the coupling of the horizontal and rocking motions of the foundation. The method gives the uncoupled structural fixed-base frequency f1 and rigid-body rocking frequency fR using data only from two horizontal sensors (at base and roof...

ONE OF the most important problems in the field of earthquake engineering deals with the dynamics of structures. Any building is an elastic system. As such, its deflections (stresses) during an earthquake may depend on its own dynamical characteristics as well as on the nature of the ground motion. An ordinary building is a relatively complicated dynamic system, usually of many degrees of freed...

performance seismic evaluation is an important topic in earthquake engineering. in this regard, several methods have previously been developed and used. the main objective of present research is to evaluate two methods including “capacity spectrum method (csm)” and “improved capacity spectrum method (icsm)” in determination of seismic performance of concrete frames. for this purpose, several sa...