Anti-seismic Performance Evaluation And Optimization For Frame Structure With Viscous Dampers

Earthquake disaster is the main human natural disasters, it has the characteristics of sudden and devastating. A sudden and unexpected strong earthquake often bring serious huge harm to social and economic development.human survival security and social stability, social function. Research shows that, in the earthquake, the main factors of causing casualties and economic loss is houses collapsed and it,s secondary disasters (about95%). Our country is an area where earthquake happen frequently. Recently in China many large earthquakes such as Wenchuan earthquake, Yushu earthquake and Yingjiang earthquake this years caused larger damage to housing construction. In order to reduce the loss of life and property of the people, and to make the building structure in service encounter when the earthquake has corresponding security reserves, you need to do structure appraisal and reinforcement. The traditional seismic strengthening way is with "hard fight" as the main way, such as by increasing the materials consumption, increasing structure section and improving weight of the buildings, in order to ensure that the structure itself has the enough strength, stiffness and ductility, so that the design of buildings can do "small earthquakes are not damaged, but medium earthquake are repaired and heavy earthquake are not collapsed", so as to achieve the purpose of reducing seismic. Although according to the design method, the structure design can prevent the structure from been collapsed, but structure or structures of internal facilities and decoration may completely serious damaged, in order to avoid the disaster, we must do control to the response of structural system under the effects of earthquake. Active anti-seismic method is to try not to produce very big shift and damage to the building so as to absorb or consume the energy of earthquake effect, this is the effect of energy dissipating structure. Structure energy dissipation technology is through using earthquake-reduction device to the structure (such as viscous dampers, etc) to consume the earthquake energy to achieve the purpose of anti-seismic, and earthquake-reduction device is always simple in construction, material economic, environmental influence small, facilitating construction, damping effect is obvious advantages, which is being widely used in civil engineering structure anti-seismic field.In recent years structure damping control technology, as a kind of effective against earthquake (winds) method, is the extensive researched and used, and which gradually become a more mature technology. Structure damping control method changes the traditional structure by improving the stiffness, strength and ductility of the structure to improve the structure anti-seismic or anti-wind ability, but through the adjustment or change the structure of the dynamic properties, change the vibration response of the structure, which effectively protected structure security in the earthquake (winds).Put viscous damper in the structure to control the vibration reaction of the structure which shock absorption can disappear is an effective, safe, reliable, economic shock absorption method in the structure damping control technology.The main content of this article and the main conclusion includes the following aspects:(1) viscous dampers and its performance study. From the basic performance of the viscous damper, understand the basic principle and the restoring force model, and discuss its equivalent linearization method and determinate equivalent damping ratio.(2) Introduce viscous damping energy dissipation structure design method and analysis method. Discusses the energy dissipation concept design the basic requirements of earthquake-reduction structure and performance standards, determine the number and the layout method of viscous dampers, this paper introduces common analysis method of the viscous damping energy dissipation structure.(3) Take a reinforced concrete frame structure as the actual engineering background, analysis and research the application of viscous damping energy dissipation system method in the building. Using the finite element software SAP2000, a calculation model is build for the project to do time-history analysis, through the dynamic response comparison between control structure and uncontrol structure can find that the viscous damping method can reduce structure shock effect, and get the related conclusions. The results show that:additional viscous dampers, structure acceleration, layer displacement, layer displacement angle between displacement between Angle and interlayer shear have different degrees of obvious reduced, and reduce the range even.In addition, the result of this paper will be applied in practice, it is a kind of new technology which has a wide application prospects.