INTRODUCTION
- Conventional seismic design, performance criteria. The concept of seismic isolation and energy dissipation. Selected list of some recent seismic isolated projects
LINEAR VISCOELASTIC BEHAVIOR
- Storage and loss stiffnesses, loss tangent. The concept of equivalent linear analysis. Modal damping ratios and effective damping coefficients. Frequency domain response.
HYSTERETIC BEHAVIOR
- Frequency independent behavior. Transient motions; limitations of equivalent linear analysis.
SEISMIC ISOLATION
- The linear theory of seismic isolation. Observed responses of base-isolated structures.
EARTHQUAKE REGULATIONS FOR SEISMIC ISOLATION
UBC – SEAONC. FEMA 273 & 274.
BEHAVIOR OF ELASTOMERIC BEARINGS UNDER COMPRESSION AND BENDING
- Construction of elastomeric bearings. Rubber properties. Analysis under compression. Analysis under shear. Analysis under rotation. Stability.
BEHAVIOR OF SLIDING BEARINGS
- Properties of sliding bearings. Single concave and double concave spherical sliding bearings. Flat sliders and restoring force devices.
PASSIVE ENERGY DISSIPATION SYSTEMS
- Metallic dampers. Friction dampers. Viscoelastic dampers. Fluid dampers
VISCOUS HEATING