EXPERIMENTAL STUDY ON THE SEISMIC BEHAVIOR OF ENERGY-DISSIPATION BRACED FRAME STRUCTURES WITH LEAD EXTRUSION DAMPERS

摘要

Adopting the longitudinal seismic braced frame structures of large scale power plant as an experimental prototype, and based on low-cycle test of lead extrusion dampers and pseudo-static model structure experiment, seismic behavior of the longitudinal R. C. flame with lead extrusion damper braces is introduced in this paper. Main contents of this paper include the following: the deformability, capacity, energy-dissipation capacity and corresponding restoring force constitutive relations of lead extrusion dampers and the energy-dissipation bracings are analyzed; whole failure process, seismic failure mechanism, internal forces' properties and corresponding laws of the distribution and transfer of internal forces for the model structure systems under seismic action are investigated; seismic performance of the test model, such as load-carrying capacity, stiffness, ductility, energy-dissipation capacity and characteristics of restoring force are evaluated; at last the properties of the integral deformation and member's local deformation are studied. The results show that lead extrusion dampers and the energy- dissipation bracings with dampers whose energy- dissipation capacity is approximately 50 percent that of total model structure are fairly flexible and can deform so greatly that buckling of ordinary seismic bracings can be avoided. Furthermore, this paper has led to the conclusion that earthquake damage to building structures with energy-dissipation braces can be reduced effectively and the seismic-resistant capacity of structures can be greatly improved only if the seismic design is reasonably considered.