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Stochastic analysis of seismic structural response with soil-structure interaction
Sarkani, S.,Lutes, L.D.,Jin, S.,Chan, C. Techno-Press 1999 Structural Engineering and Mechanics, An Int'l Jou Vol.8 No.1
The most important features of linear soil-foundation-structure interaction are reviewed, using stochastic modeling and considering kinematic interaction, inertial interaction, and structural distortion as three separate stages of the dynamic response to the free-field motion. The way in which each of the three dynamic stages modifies the spectral density of the motion is studied, with the emphasis being on interpretation of these results, rather than on the development of new analysis techniques. Structural distortion and inertial interaction analysis are shown to be precisely modeled as linear filtering operations. Kinematic interaction, though, is more complicated, even though it has a filter-like effect on the frequency content of the motion.
Structural damping for soil-structure interaction studies
Lutes, Loren D.,Sarkani, Shahram Techno-Press 1995 Structural Engineering and Mechanics, An Int'l Jou Vol.3 No.2
A soil-structure interaction formulation is used here which is based on consideration of the dynamics of the structure with a free, rather than a fixed, base. This approach is shown to give a quite simple procedure for coupling the dynamic characteristics of the structure to those of the foundation and soil in order to obtain a matrix formulation for the complete system. In fixed-base studies it is common to presume that each natural mode of the structure has a given fraction of critical damping, and since the interaction formulation uses a free-base model, it seems natural for this situation to assign the equal modal damping values to free-base modes. It is shown, though, that this gives a structural model which is significantly different than the one having equal modal damping in the fixed-base modes. In particular, it is found that the damping matrix resulting in equal modal damping values for free-based modes will give a very significantly smaller damping value for the fundamental distortional mode of the fixed-base structure. Ignoring this fact could lead one to attribute dynamic effects to interaction which are actually due to the choice of damping.
Building blocks of nanosized supported metals for catalysis: Carbonyl clusters or colloids?
A. Beck,A. Horvath,A. Sarkany,L. Guczi 한국물리학회 2006 Current Applied Physics Vol.6 No.2
As case studies, two methods on the preparation of supported metal nanoparticles for catalytic purposes are discussed: (i) startingfrom metal carbonyl clusters and (ii) growing particles in liquid phase followed by deposition on support or in situ fabricating themon the support in solid/liquid interfacial layer. We highlight the advantages and disadvantages of the dierent techniques with spe-cial regard to the size control and stability of the catalysts obtained