ABSTRACT
Seismic Performance of Structures Installed with Cantilever-Type Steel Dampers
Ahn, Tae-Sang
Department of Civil, Environmental and Architectural Engineering
Graduate School of Korea University
Advised by Professor Kim, Sang-Dae
In this paper, A new type of steel damper was suggested...
ABSTRACT
Seismic Performance of Structures Installed with Cantilever-Type Steel Dampers
Ahn, Tae-Sang
Department of Civil, Environmental and Architectural Engineering
Graduate School of Korea University
Advised by Professor Kim, Sang-Dae
In this paper, A new type of steel damper was suggested responding to an increase in the frequency of occurrence of earthquake and strengthening of seismic design criteria as well as seismic repair reinforcement in Korea. To clarify the effect of the steel damper proposed, Analyzed research and experimental studies were conducted. First of all, the energy dissipation capability and history characteristics of the damper has been proposed through the experiments on steel damper element. After this, the residual deformation capacity in the after-shock and energy dissipation capability of steel damper was evaluated in the system by performing a real experiment of shear wall damping system with this steel damper. Finally, the non-linear static and dynamic analysis of the building that have been applied this steel damper was conducted, this paper also compared the performance of before and after application of this damper. Research summary are as follows :
(1) Proposed New shaped Steel damper exhibits stable hysteresis characteristic on the basis of the typical cantilever behavior, the damper element shows the results that the deformation capacity was increased if (B/b) increases or the number of the damper steel plate is two, however, the influence of the thickness of the steel plate was insignificant. When it comes to the deformation distribution, Deformation distribution indicates that there is a strong possibility of damper would be broken at an early stage with stress concentration if the width ratio of the damper element is small. On the other hand, An increase of the damper steel surface counts enabled deformation distribution to reduce. Therefore, it is determined that the increase of damper (B/b) ratio as well as the two steel plates number of surfaces are very efficient to prevent stress concentration.
(2) From the result of repeated loading tests of the damper, it showed that the energy dissipation capability of the damper was stable in the force of the second step when the residual shear deformation angle was 5%., if the residual shear deformation to become more than 10%, angle degradation of performance was observed very clearly in accordance with the residual shear deformation. However, the experiment was limited and even the experimental damper experienced 15% residual shear deformation showed the dissipation capability of approximately 60% of the test specimens, it is determined that the energy dissipation performance of the proposed new damper would not loose everything even after-shocks If the deformation was not very large.
(3) From the result of the experimental lintel damping system, force displacement relationship shows the hysteretic behavior of spindle-shaped and also it was confirmed the applicability of the lintel damper. This, according to the experimental results of RC lintel beams conducted previously, large diagonal crack occurs in a structure at final destroyed step in general, on the other hand, test with lintel damping system showed a stable behavior and very fine simply crack because the damage concentrated in the damper not in the structure.
(4) The results of structural analysis of lintel damping system and shear wall damping system, the history behavior corresponds well with the experimental results, it is determined that it is appropriate to be reflected in the analysis of actual structures on the base of these results.
(5) Result of the static push-over analysis of planar structures with both existing lintel beam and lintel damping device, in the case of structure with existing lintel beam displayed a significant reduction in strength at the time when two lintel connecting beam did brittle fracture, and then, two shear walls were found to behave like a cantilever to another structure. On the other hand, in the case of the structure with lintel damper showed ductility behavior since it is running properly the role of the coupling that connects the two shear wall.
ABSTRACT
Seismic Performance of Structures Installed with Cantilever-Type Steel Dampers
Ahn, Tae-Sang
Department of Civil, Environmental and Architectural Engineering
Graduate School of Korea University
Advised by Professor Kim, Sang-Dae
In this paper, A new type of steel damper was suggested responding to an increase in the frequency of occurrence of earthquake and strengthening of seismic design criteria as well as seismic repair reinforcement in Korea. To clarify the effect of the steel damper proposed, Analyzed research and experimental studies were conducted. First of all, the energy dissipation capability and history characteristics of the damper has been proposed through the experiments on steel damper element. After this, the residual deformation capacity in the after-shock and energy dissipation capability of steel damper was evaluated in the system by performing a real experiment of shear wall damping system with this steel damper. Finally, the non-linear static and dynamic analysis of the building that have been applied this steel damper was conducted, this paper also compared the performance of before and after application of this damper. Research summary are as follows :
(1) Proposed New shaped Steel damper exhibits stable hysteresis characteristic on the basis of the typical cantilever behavior, the damper element shows the results that the deformation capacity was increased if (B/b) increases or the number of the damper steel plate is two, however, the influence of the thickness of the steel plate was insignificant. When it comes to the deformation distribution, Deformation distribution indicates that there is a strong possibility of damper would be broken at an early stage with stress concentration if the width ratio of the damper element is small. On the other hand, An increase of the damper steel surface counts enabled deformation distribution to reduce. Therefore, it is determined that the increase of damper (B/b) ratio as well as the two steel plates number of surfaces are very efficient to prevent stress concentration.
(2) From the result of repeated loading tests of the damper, it showed that the energy dissipation capability of the damper was stable in the force of the second step when the residual shear deformation angle was 5%., if the residual shear deformation to become more than 10%, angle degradation of performance was observed very clearly in accordance with the residual shear deformation. However, the experiment was limited and even the experimental damper experienced 15% residual shear deformation showed the dissipation capability of approximately 60% of the test specimens, it is determined that the energy dissipation performance of the proposed new damper would not loose everything even after-shocks If the deformation was not very large.
(3) From the result of the experimental lintel damping system, force displacement relationship shows the hysteretic behavior of spindle-shaped and also it was confirmed the applicability of the lintel damper. This, according to the experimental results of RC lintel beams conducted previously, large diagonal crack occurs in a structure at final destroyed step in general, on the other hand, test with lintel damping system showed a stable behavior and very fine simply crack because the damage concentrated in the damper not in the structure.
(4) The results of structural analysis of lintel damping system and shear wall damping system, the history behavior corresponds well with the experimental results, it is determined that it is appropriate to be reflected in the analysis of actual structures on the base of these results.
(5) Result of the static push-over analysis of planar structures with both existing lintel beam and lintel damping device, in the case of structure with existing lintel beam displayed a significant reduction in strength at the time when two lintel connecting beam did brittle fracture, and then, two shear walls were found to behave like a cantilever to another structure. On the other hand, in the case of the structure with lintel damper showed ductility behavior since it is running properly the role of the coupling that connects the two shear wall.
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