Mechanics of Material and Testing of in-Plane Arched Damper
|關鍵字:||金屬阻尼器;門形阻尼器;拱形阻尼器;曲梁理論;耐震性能試驗;metallic damper;in-plane flexural damper;in-plane arched damper;theory of curved beam;seismic performance test|
This study proposes two types of displacement-dependent metallic yielding dampers, namely the in-Plane Flexural Damper (i-PFD) and in-Plane Arched Damper (i-PAD), to be used as seismic energy-dissipative devices with improved efficiency on material utilization. Linear theories of the proposed dampers are developed based on mechanics of materials for straight or curved beams. Initial stiffness of the dampers predicted using the linear theory agrees very well with those obtained from the component tests. And the prediction is more accurate for i-PFD than i-PAD. The error is due to violation of the basic hypotheses of mechanics of materials with the introduction of shear deformation under inevitable shear forces produced in a curved geometry. Being stable in repeated cycles, the hysteresis obtained from the component tests exhibit characteristics of fullness and show good correlations with the ANSYS analysis. The i-PAD is experimentally proved superior not only in ductility but also in ultimate strength. Allowed to yield and dissipate energy in an early stage, the i-PAD turns out to be a potentially better device for building applications. Excellent performance of the i-PAD for seismic protection of structures has been achieved via the shaking table tests. With the dampers implemented, the effective modal damping ratios of the structure increase with the earthquake intensity.
|Appears in Collections:||Thesis|