[1] Predicting accurate ground motion is critical for earthquake hazard analysis, particularly in situations where sedimentary basins trap and amplify seismic waves. We exploit the information carried by the ambient seismic field to extract surface-wave Green’s functions between seismic stations and to predict long-period ground motion from earthquakes. To do so, we modify the surface impulse r...

In recent years, the structural engineering community has been actively exploring the use of wireless sensors in structural monitoring systems. A direct result of low-cost wireless sensors is wireless monitoring systems defined by high nodal densities offering extensive sets of structural response data. Such data sets can serve as a powerful tool for validation of structural design assumptions ...

We expound on the nature of collapse of one class of tall buildings (steel moment frame buildings) under earthquake excitation. Using a parametric analysis of a couple of index buildings subjected to idealized ground motion histories, we establish the ground motion features that cause collapse in these structures. Systematically mapping damage localization patterns, we track the evolution of th...

We address the issue of the quality of hybrid simulation, an experimental method used in earthquake engineering to examine the response of structural systems to dynamic excitation. After describing the typical sources and the effects of measurement and actuation errors, we present a reachability-based formulation of error propagation in hybrid simulation. This approach predicts possible (sets o...

In the present article, effect of non-uniform excitation of reservoir bottom on nonlinear response of concrete gravity dams is considered. Anisotropic damage mechanics approach is used to model nonlinear behavior of mass concrete in 2D space. The tallest monolith of Pine Flat dam is selected as a case study. The horizontal and vertical components of 1967 Koyna earthquake is used to excite the s...

An analytical approach is presented to assess the response of offshore structures under seismic excitation. This paper evaluates the impacts of different fluid field models and the mass of equipment at the top of offshore structure which is simulated as lumped mass on the responses of offshore structures. To do this, two and three dimensional fluid field models are developed. In three dimension...

It is hypothesized that interplay of earthquake, soil, foundation and structure (SFS) dynamic characteristic, and their interaction in time domain, control the behavior of SFS system during earthquakes. Moreover, (passive and active) control of spatial and temporal location of seismic energy dissipation (preferably in soil) can improve safety and economy of SFS systems. Such energy dissipation ...

A 1/20 scale model of a Y-shaped irregular bridge was designed, and shaking-table tests were performed to simulate its failure mechanism performance characteristics when subjected multidirectional strong earthquake. The results showed that the structure could accelerate in horizontal direction vertical excitation. For both unidirectional excitation, acceleration response pier top more significa...

The present study focuses on the estimation of response building structure supplemented with superelastic shape memory alloy (SMA) damper under stochastic seismic excitation. To this end, has been determined using linearization method random earthquakes and control efficiency SMA is compared yield damper. As output, top floor root mean square (rms) acceleration displacement are presented here i...