Seismic Vulnerability Of A Typical Multi-story Reinforced Concrete Kindergarten Building And Its Residual Capacity Withstand An Aftershock

Kindergarten building is a type of school buildingand the research on its earthquake resistance property is as important as the works on school building.The building of Longtoushan Kindergarten was selected as a typical structure in this paper,whichwas damaged during the Ludian earthquake.A detailed survey about the damage state of this building was conducted quickly after the Ludian earthquake.Based on the collected information and data,the finite element model of this building was built and the incremental dynamic analysis was performed by using the software of OpenSees.Earthquake resistance capacity and seismic vulnerability of this building was obtained.After that,the residual capacity of this building with various damage states was addressed by using the incremental dynamic analysis method.The research content of this study is as follows:(1)The building of Longtoushan Kindergarten,which was damaged during the Ludian earthquake,was selected as a typical structure.The finite element model of this building was built by using the software of OpenSees.Its seismic responses under the main shock of Ludian earthquake were analyzed.The response of the numerical model was compared with the damage state of the real building and then the reliability of the finite element model was verified.(2)By using theincremental dynamic analysis method,the seismic responses of the Longtoushan Kindergarten building under earthquakes were calculated.Six earthquake records with incremental amplitude were chosen as the earthquake inputs for the building.Then the IDA curves and seismic fragility curves of this building were obtained.(3)The main shock-aftershock series were established for the building of Longtoushan Kindergarten.The seismic responses of this building under these earthquake series were calculated.The residual capacities of this building with various damage states induced by the action of main shocks were obtained.The relationship between the residual capacity of the building and its damage indices after main shock was given.