Seismic Response Analysis Of Structure With Energy Dissipation Devices Based On Balance Method

Based on energy balance principle, using the nonlinear software PERFORM-3D developed by the university of California, doing energy dissipation design for a seven story frame structure and a fifteen story frame-sheer wall structure, then load seismic waves to conduct elasto-plastic time history analysis, analyzing the effect of total input energy and energy consumption for structure with energy dissipation devices under location and number of the dampers confirmed, seismic dynamic characteristics(peak acceleration, spectral characteristics of seismic waves, seismic duration), dynamic characteristics of construction(damping ratio, ductility ratio, unitary stiffness). Discussing seismic hysteresis energy distribution rule in layer and component. The main conclusion are as follows:By changing the location and number of the dampers confirmed, designing five different energy dissipation schemes for each frame structure and frame-sheer wall structure, The two groups are all loaded with 50 seismic waves. Research the seismic energy response of structure under the effect of dampers’ location and number. The results shows that: it has a great influence on seismic energy response of energy dissipation structures, this two factors interact and influence each other, bring the general affects on seismic energy response, for the number of dampers of energy dissipation structures for seismic resistance, more isn’t always better, the damper layout should follow certain principle, arranged evenly along vertical direction is best, then set every other floor along vertical direction. When setting dampers every other floor along vertical direction, the hysteresis energy will be transferred to neighbor floor. Finally comparing the different schemes, selecting the best scheme.Next, by changing seismic dynamic characteristics and dynamic characteristics of construction of for the selected frame and frame-sheer wall structures with energy dissipation devices, research the seismic energy response of structure under the effect of this two faction. The total input energy and structure consumption energy under seismic response increase with the peak acceleration(PGA) increasing. For the structural damping energy proportion of total seismic input energy, the frame construction shows that, along with the increase of PGA, increasing first then decreasing and being gently finally, the frame-sheer wall structure shows, decrease first then increase. For the viscous damper energy proportion of total seismic input energy, the frame construction shows, increasing first then being gently finally along with the increase of PGA, the frame-sheer wall structure shows that increase first then decrease; The total input energy and structure consumption energy of energy dissipation structures are strongly effect by the seismic frequency spectra, and the impact has high randomicity and uncertainty; The seismic duration influences seriously energy response of the structure with energy dissipation devices. EI, EH, ED, Ed all increasing along with the increase of seismic duration. EE and EK fluctuates up and down over a period of time, at last, EK turned to zero, EE turned to a general figure; The different damping ratio has little influence on the total input energy, hysteresis energy and viscous damper energy decreasing along with the increase of damping ratio, damping energy increasing along with that; Ductility ratio had different impact on frame construction and frame-sheer wall structure. Unitary stiffness has little influence on the total input energy and its distribution of every energy, but has a great influence on seismic hysteresis energy distribution rule in layer and component.