Papers by Keyword: Hysteretic Energy Dissipation

Abstract: Collapse of buildings in earthquakes causes casualties and economic losses, the reinforced concrete columns damage models is a basis for the research of integer collapse. The major advantage of Park and Ang's method is the consideration of first exceedance failure and cumulative damage failure in terms of defining the structural damage under earthquake, however, it isn't consider the differences of structural failures by different displacement amplitudes and load sequence. By multiplying the effective energy dissipation factor and the load sequence factor, the modified Park-Ang seismic damage model is obtained. The comparison between the two models indicates that the modified Park-Ang model have mean value closer to 1 and smaller scatter, besides the effects of load path and load sequence on damage can be taken into account in the modified model.

Abstract: A new kind of mild steel damper which use corrugated plate as energy-intensive steel plate is proposed in this paper. The structures and energy dissipation principles of the new type damper are presented. The hysteretic performances of corrugated mild steel damper with different height-thickness ratio, or with the same height-thickness ratio but with different thickness are analysed by numerical simulation with ABAQUS platform and then parameter study on this kind of damper in detail. The results show that the corrugated steel damper has good and stable energy dissipation performance. The performance of energy consumption increases with the decreasing of height-thickness ratio. When at the same height-thickness ratio, the performance of energy consumption increases with the thickness of energy-intensive steel plate.

Abstract: The energy equations of MDOF bridges are established based on the energy equilibrium theory. With considering the seismic characteristics, the FEA model of one double-column pier of passenger dedicated line is established in order to research the seismic energy response and its distribution rules when MDOF bridges entry the nonlinear state. The study results are obtained as follow: Bridge subjected to minor ground motion is depended on damping energy dissipation to consume seismic input energy. On the contrary, a large number of inelastic deformation is generated when bridge is subjected to strong ground motion. So the seismic input energy is mainly consumed by hysteretic energy dissipation. So, some meaningful references are provided for the seismic design for bridge by using energy concept.

Abstract: A new RC frame multi-ribbed composite walls structure is provided by using low yield strength steel. Two calculating structures are analyzed which one is the RC frame shear wall structure used as a comparison, and the other is the RC frame multi-ribbed composite walls structure. The nonlinear earthquake responses of the structures are calculated by using program IDARC2D.The nonlinear dynamic analysis models of the structures are established with retrogressive three-linear resilience model for beam, column and RC shear wall elements, while a smooth hysteretic model is proposed for representing low yield strength steel panels. The nonlinear dynamic time-history analysis of the structures under horizontal earthquake waves has been carried out. The earthquake responses of the structures and energy dissipation are studied, which provide more data information for the comprehension of earthquake responses and seismic performance of the RC frame multi-ribbed composite walls structure. The calculating results show that the low yield strength steel panels have obvious seismic mitigation effects, and that RC frame multi-ribbed composite walls structure has good seismic capacity.

Abstract: Through experimental study on three HRB400 steel bar reinforced concrete columns subjected to low cyclic reversed loading, the failure patterns, hysteretic curves and skeleton curves were obtained. The influence of longitudinal high-strength reinforcement ratio upon the hysteretic characteristics, ductile behavior and ability of energy dissipation were analyzed. The results show that the main failure pattern was bending failure; and with the increscent of the longitudinal high-strength reinforcing steel bar ratio, the columns can endure larger seismic loads and displacement; the seismic performance of the whole reinforced concrete columns can be effectively improved by arranging reasonable high-strength steel bars.

Abstract: Based on the general FEA program, the bidirectional nonlinear behavior of lead rubber bearing is taken into account by using two orthogonal nonlinear spring elements. Considering the effect of radius of curvature, lead diameter and dissimilar seismic motions, dimensional FEA model of seismically isolated curved continuous bridge is established. And the seismic energy response analyses for seismically isolated curved continuous bridge are carried out under the three-dimensional seismic motions. So, some meaningful references are provided for the design of vibration absorption and isolation of the curved beam bridge in this paper.

Abstract: This paper present a new seismic isolation device which assembled sliding friction, energy dissipation and limit, then clarified the work performance and the optimization of its design ideas. The author utilized FEM analysis software ANSYS to establish a parametric model, taking the working condition of single-ring and stress concentration distribution under the yield state as the research object, the shape of the energy loop was optimum designed, and the hysteresis energy consumption performance of seismic isolation bearings was analyzed before and after optimizing. It can be received that energy consumption performance of the seismic isolation bearings improved 32.7% after optimizing. A 6 layer frame structure FEM model was built, at this basis, the seismic responses of fixed structure and sliding seismic isolation structure of foundations were compared. The results indicated that the seismic responses of sliding structures decreased significantly.