Theoretical Analysis And Experimental Research On Ceiling System For Large Span Building Structure

Non-structural components are all components except the building structure.Non-structural components in large-span building structures mainly include Ma Road,wind tube,lamps,speakers,ceiling system and other roof hanging objects.Non-structural components play an important role to complete the function of the use of the building,and are widely used and all kinds of buildings.In the earthquake the damage degree of the non-structural is more serious than that of the structural elements.The seismic performance of non-structural members has been paid more and more attention by the scholars of all countries.The suspended ceiling system in large span structures is the research object.Theoretical analysis,numerical simulation and experimental study are used on the research of suspended ceiling system of self-vibration characteristics,seismic dynamic response and failure modes of,mainly to study the ceiling system is simplified into a simple pendulum,pendulum as research object,and joined the middle suspender and hinge structure measures,by theoretical method and numerical method to study the self-vibration characteristics and forced vibration characteristics.Using the ceiling system as the research object,the ceiling numerical model is established,and the natural vibration characteristics and seismic response of the suspended ceiling system are studied by numerical method.Through the vulnerability analysis method,the function relationship between different seismic response and seismic intensity is studied,and the vulnerability curve of different seismic response is plotted.The shaking table test was carried out for the suspended ceiling system,and the 3 groups were designed.The different structures of the boom were considered.The different stiffness was considered.Experimental study on the collapse failure of the suspended ceiling system,the vibration frequency and the seismic response of the suspended ceiling system and the failure mode of the suspended ceiling system are studied.Through the study draw the following conclusions: 1)middle suspender and hinge structure measures,make the pose of the second mode,when the quality ratio by the change of 0.01 to 1,placed the first order frequency change is very small,and corresponding to a pendulum frequency very close to;second order frequencies from 17.233 Hz reduced to 2.2418 Hz,change more obvious.When the hinge position is not at the same time,placed the first order frequency change is very small,and corresponding to a pendulum frequency very close to;second order frequency changes,the hinge in the middle,the second order frequency is the minimum 2.2418 Hz.2)ceiling model of low order main modes for horizontal vibration type,horizontal swing vibration cycle and the corresponding pendulum frequency close to,frequency and swing on the length.The high modes for vertical vibration,keel bending,frequency is affected by the stiffness of the keel.In the earthquake,the main vibration mode of the suspended ceiling is the horizontal swing mode,the main swing frequency is similar to the first and second order frequency.The bending mode of vertical keel was not appeared.3)the failure mode of the suspended ceiling in the earthquake is the connection between the keel,or the failure of the boom will lead to the destruction of the whole.