The Shaking Table Test Analysis Of Steel Concrete Hybrid Structure

Earthquake tends to cause great casualties and destruction to buildings.The traditional seismic design and the isolation design on the issue of how to resist the effect of earthquake on buildings have big differences on their design methods.The former one focuses on preventing building collapse as well as protecting the personal security.When earthquake occurs,it relies on the structural damage to absorb seismic energy,however,the deformation of upper structure will generally result in internal damage of buildings and casualties.For the isolation design,emphasis is given to control the damage on the upper structure by using isolation layer which absorbs the majority of the seismic energy to ensure that the upper structure could work within the elastic range.This design not only avoids the structure from destruction,but also effectively protects the contents in the house.In recent years,both domestic and foreign scholars have done a great number of researches on the structure with separate isolating stand or damper,and acquired numerous achievements.But there are a few studies on the construction installed the isolation bearing and the damper at the same time.Therefore,this paper aims at researching the seismic isolation structure with rubber bearings and viscous dampers under horizontal earthquake.The main contents are as follows:(1)Brief introduction of the development history,present situation,characteristic and application of the laminated rubber bearing and viscous dampers.Meanwhile,illustrating the performance,analysis method,the basic principle of the viscous damper,the mechanical model and the analysis method of the structure after adding the viscous damper respectively.(2)The multi-mode shaking table tests of a two-layer composite structure with reinforcement concrete structure in the bottom and steel structure in the top under different acceleration amplitude of seismic waves,which are the original structure,the isolation structure installing the isolation bearing and the shock absorber structure with the seismic isolation bearing and the viscous damping.The research tested the acceleration,displacement and strain separately and compared the shock energy dissipation performance among the three types of structure.The result shows that the period of the structure is effectively prolonged after the installation of the isolation bearing,and the acceleration as well as interlayer displacement are obviously reduced.The shock absorption effect is significant.After the viscous damper is added to the base isolation structure,the lateral stiffness increases,resulting in evident decrease in the top-level acceleration and interlayer displacement.However,decreased amplitude of the acceleration of the isolation layer is not apparent and the installation of the viscous dampers exacerbates the energy consumption,indicating that the damping effect is closely related to the position of the damper.(3)the elastic-plastic theory and software Midas Gen were used to establish the finite element model and analyze the elastoplastic time history calculation respectively.The simulation results were compared with the experimental results and it shows that the finite element analysis can feasibly and effectively simulate the engineering practical problems,as its results are in good agreement with that of the experiment.