Study On Temperature Effect Of Super-long Structure With Displacement Type Energy Dissipator

After many painful disasters and lessons caused by many large earthquakes,in order to ensure the safety of building structures,concrete structure technology and energy dissipation technology have been developed rapidly,so energy dissipation devices are widely used in large public building structures.however,some problems should be paid attention to in the process of damping design,including the temperature effect of super-long concrete structures with plane size.For structures with special needs in the use of buildings,the design of expansion joints is generally not allowed.When the length of such structures exceeds the allowable value of the code,it is necessary to calculate the temperature effect.In order to better ensure the safety of super-long damping structure,this requires the energy dissipator to be in an elastic recoverable state under the action of normal temperature difference,so the application of energy dissipator in the study of temperature effect in superlong structure has high practical value.Focusing on the reinforced concrete super-long frame structure,a series of research work has been carried out in this paper,taking the temperature difference effect of displacement energy dissipator as the research object.The main contents are as follows:First of all,taking one side of the deformation fixed point under the action of temperature as the isolation body,the approximate calculation formula of the damping force of displacement damper in single-story and multi-story super-long concrete frame structure is derived,and the formula is verified by an engineering example.then,in a single-story single-span plane frame,the effects of beam-column stiffness,span,floor height and the stiffness of connecting members of the damper on the temperature effect of the damper are studied.In the multi-story and multi-span super-long plane frame structure with displacement dampers,the temperature effects of different support forms of the dampers are compared and analyzed,and the influence of the total number of layers of the super-long damping structure on the temperature effect of the dampers is also explored;Secondly,in order to study the relationship between the longitudinal length,the beamcolumn linear stiffness ratio,the stiffness of the energy dissipator and the temperature deformation of the energy dissipator,in each longitudinal length model,four kinds of beamcolumn linear stiffness ratio are 0.6,1.4,2.6,4.6 and four kinds of energy dissipators are300 k N/mm,400 k N/mm,500 k N/mm and 600 k N,respectively.When the overall temperature difference is 20 ℃,any combination is carried out and the calculation and analysis is carried out.The deformation law of the energy dissipator under the most unfavorable condition of the frame structure is obtained when the longitudinal length of the structure is 60 m,72m,84 m and 96 m,which provides an engineering reference for the design of displacement energy dissipators for super-long frame structures under the action of temperature;Finally,the temperature effect of the spatial model of the rectangular super-long frame structure with displacement damper is studied in the finite element software SAP2000,and the distribution rules of the overall displacement of the damping structure,the maximum displacement of the frame column on each floor and the floor displacement are analyzed,and the effects of the floor thickness,the number of secondary beams and the opening position of the floor on the temperature deformation of the displacement damper in the superlong frame structure are studied.