abstract: the experience of last earthquakes has shown the vulnerability of most of structures. this has been caused the speeding up of the seismic evaluation and retrofitting of projects in iran. in this regard, the instructions for seismic rehabilitation of the existing buildings have been published and are currently beiong used in the evaluation and retrofitting projects. the experience of r...

This paper presents the results of using frame structures in industrial construction with pile foundations under dynamic influences. In course study, a set formulas were derived to determine amplitude-frequency characteristics system "flat frame-grillage-group piles" at different levels action loads excited from seismic platform, and natural frequencies calculated, bending moments, shear forces...