Experimental study of steel slit damper for passive energy dissipation

Seismic performance of steel structures with slit dampers

https://eprints.usq.edu.au/18216/4/Ghabraie_Chan_Huang_Xie_ES_2010_AV.pdf

Shape optimization of metallic yielding devices for passive mitigation of seismic energy

Free from damage beam-to-column joints: Testing and design of DST connections with friction pads

Hysteretic behaviour of dissipative bolted fuses for earthquake resistant steel frames

Mechanical property of beam-to-column moment connection with hysteretic dampers for column weak axis

This paper presents an innovative structural system, named weld-free system, developed to overcome the difficulty in the quality assurance encountered in construction of steel moment resisting frames with conventional welded connections. The proposed structural system adopts a mechanical joint equipped with metallic-yielding damper as beam-to-column connection, wherein slip-critical joints are made by recently developed super high-strength bolts. The structural configuration and load-carrying mechanism of weld-free steel structures are described herein. Key features of the super high-strength bolts are also introduced. Furthermore, an experimental verification is presented. Cyclic tests were conducted on full-scale models of weld-free beam-column subassemblies and one base-line specimen with conventional welded connection. The test results clearly reveal the efficiency of the weld-free system in enhancing large and stable hysteresis loops while maintaining the beams and columns virtually in the elastic range until the ultimate state of the structure. It is also verified that the load-carrying mechanism of weld-free systems can be predicted very well by the presented theoretical solutions.

Seismic-Resistant Weld-Free Steel Frame Buildings with Mechanical Joints and Hysteretic Dampers

This paper deals with the development of simple, yet accurate design formulas for elastic stability of finite plates, simply supported and reinforced with multiple equidistant stiffeners, under shear. Several stiffener arrangements are considered. In each case, the plate aspect ratio is varied over a practical range for stiffened plates to be used as shear-type hysteretic dampers for building and civil engineering structures. The buckling coefficients are determined by means of the elastic buckling theory, considering both symmetric and antisymmetric buckling configurations. The obtained numerical results are employed in the developments of approximate formulas for the buckling coefficient and optimum rigidity of the stiffener. The computed optimum rigidities are compared with the results available in the literature. It is apparent that all of the proposed formulas can be used precisely to fulfill the need in design of shear-type hysteretic dampers as well as general stiffened plates in shear.

New Elastic Stability Formulas for Multiple-Stiffened Shear Panels

An experimental investigation of the cyclic shear behaviour of steel box girders was conducted on one-quarter scale models, comprising of two specimens with longitudinally unstiffened webs and one specimen with longitudinally stiffened webs. All the specimens exhibited ductile behaviour. The tests evidenced significant increases in the shear strength and energy dissipation capacity regarding the use of thicker webs and the provision of longitudinal web stiffeners. The web stiffeners also enhanced the stable hysteresis behaviour without substantial degradation in the energy dissipation due to pinching. The test results are compared with the shear behaviour simulated by inelastic large deformation analysis incorporated with a sophisticated constitutive model. The hysteresis behaviour, peak cyclic shear stresses, energy dissipation, and deformation shapes of the three specimens are satisfactorily predicted by the analysis. It is verified that the presented analytical method can be used precisely for further investigations of box girders in shear.

Cyclic shear behaviour of steel box girders: experiment and analysis

This paper presents practical methods for predictions of strength and ductility capacity of thin-walled steel box girders with longitudinally stiffened webs predominantly loaded in shear. The shear behaviors of the girders under monotonic and cyclic loadings are simulated through inelastic large deformation analysis, in which a modified two-surface model is incorporated to trace the material nonlinearity. Geometric and material imperfections are taken into account. During the analysis, the variation of stresses in the webs and flanges is monitored, and the observed shear-resisting mechanisms of the girders are discussed. An extensive parametric study is carried out to investigate the effects of structural parameters on the shear strength and ductility capacity. From these investigations, the application of available shear strength prediction methods, originally developed for plate girders, to box girders is verified. Some method is found to be appropriate for practical design, since it gives satisfactory ...

Praween Chusilp

Papers

Mechanical property of beam-to-column moment connection with hysteretic dampers for column weak axis

Seismic-Resistant Weld-Free Steel Frame Buildings with Mechanical Joints and Hysteretic Dampers

New Elastic Stability Formulas for Multiple-Stiffened Shear Panels

Cyclic shear behaviour of steel box girders: experiment and analysis

Strength and ductility of steel box girders under cyclic shear