Preface. List of symbols. 1. Characteristics of Seismic Effects. Causes of an earthquake and theory of its mechanism. Evaluation of methods of random seismic motions. The methods of numerical solution of spectral characteristics of seismic effects. Spectral characteristics of weak earthquakes and microvibrations of soil. Synthetic seismic accelerograms. Design seismic spectra. 2. Dynamic Properties of Full Scale Structures. Dynamic measurements on structures in situ. Measuring instruments and devices. The methods of analysis of measured data. Experimental dynamic properties of structures. Formulation of dynamic calculation models. Calculation methods for the solution of natural frequencies and modes of vibration of discrete systems. Empirical relations for determining the first natural frequencies of buildings. 3. Methods of Solution of the Seismic Response of Structures. The theory of motion of a building under the seismic loading. The numerical solution of the seismic response of a structure. Seismic response of the guyed TV mast. 4. Some Problems of the Seismic Response of More Complicated Structures. Structures with an asymmetrical layout of vertical supporting elements. The effect of axial forces in columns of structures with soft storeys. Soil -structure interaction; essential problems. 5. The Non-Linear Seismic Response of Structures. The elasto-plastic reserve of structures and hysteretic calculation models. Non-linear seismic response spectra. The non-linear seismic response of frame systems. Laboratory seismic testing. 6. Design Requirements of Structures in Seismic Regions. Basic structural principles of seismic design. Protection of structures against extreme effects of seismic motions. Conclusion. References. Subject Index.