Analysis Of Seismic Vulnerability Of Reinforced Concrete Workshop Structure

Reinforced concrete industrial building is the main production plant of the industrial industry,which has suffered varying degrees of damage in the past earthquakes.The experience of earthquake damage shows that the disaster consequence of plant structure is more complex and serious than that of ordinary buildings,even if the occurrence of minor damage led to the damage of large instruments will cause greater economic losses and security risks.In this paper,the typical single-storey reinforced concrete industrial building is taken as the research object.Based on SAP2000 structural analysis software,the finite element analysis model of the industrial building is established;through the nonlinear dynamic time-history analysis and the random Pushover analysis method,the seismic fragility of the industrial building is studied.The main research contents and conclusions are as follows:1)Research on structural performance level of industrial building based on random Pushover analysis method.Firstly,a method based on random Pushover analysis to determine the level of plant structure performance was proposed: The Latin Hypercube Sampling was used to establish90 structural analysis samples considering material uncertainties.The seismic capability curves of the structure was calculated using the random Pushover analysis method;The failure state of the whole structure was defined according to the state of the structural components,and the limit values represented by the story-drift and its probability statistical characteristics corresponding to different failure states of the structure were determined based on the seismic capability curves of the structure.Secondly,the difference of the performance level in different directions of the structure and the influence of the filling wall on the performance level were studied.The results show that: The transverse and longitudinal failure limit states of the structure differ greatly,and the deformation limit values corresponding to each failure state differ by nearly one time.When the infilled walls are added to the structure longitudinally,the deformation limit of each failure state of the structure is smaller.2)Research on comparison of transverse and longitudinal seismic fragility of industrial building.Considering the uncertainties of structures and ground motions,90 groups of structure-ground motion system were established.Based on nonlinear dynamic time history analysis,the seismic fragility curves of lateral and longitudinal of structures were established.The differences of seismic fragility between transverse and longitudinal directions were compared and the main reasons for the differences were analyzed.The results show that: Under the same seismic intensity the transverse structure is more prone to all kinds of damage.When subjected to the seismic action at the level of a large earthquake,the exceeding probability of the transverse collapse of the structure is nearly 50% higher than that of the longitudinal one.This further indicates that in the seismic design of such industrial building,the resistance to transverse earthquake should be given priority to.3)Research on the effects of infilled walls on seismic fragility of industrial building.Using diagonal strut to simulate the action of longitudinal infilled walls,the finite element model of industrial building with and without infilled walls was established.Considering the uncertainties of structure and ground motion comprehensively,the seismic fragility curves of reinforced concrete industrial building with and without infilled walls were established through nonlinear dynamic time-history analysis,the influence of infilled walls on the seismic fragility of industrial building and the seismic fragility of infilled walls were analyzed.The results show that:Considering the effect of longitudinal infilled walls,the anti-failure ability of the structure is greatly improved.Under the same seismic intensity,the maximum vulnerability of the structure can be reduced by about 40% when considering the infilled walls.Under the same seismic intensity,the failure of the infilled walls is much more serious than the main structure.When subjected to seismic actions at the level of a large earthquake,the collapse failure probability of the infilled walls and the main structure is nearly 80% difference,which largely reflects the function of the infilled walls as the first seismic defense line and also conforms to the actual seismic damage characteristics of the industrial buildings.4)Research on the seismic fragility analysis of reinforced concrete industrial building under different levels of seismic fortification.Selecting ??????? intensity of industrial building structures,90 groups of structure-ground motion system were established.The seismic fragility curves of industrial building under different levels of fortification were established through the nonlinear dynamic time history analysis.The effects of different levels of fortification on seismic fragility of industrial building were analyzed.The results show that: With the improvement of the fortification level,the exceeding probability of different failure states of the industrial building decreases gradually under the same seismic intensity.When the fortification level is raised one level,the collapse vulnerability of the industrial building can be reduced by up to 25%.