Fragility analysis of partially-restrained steel frame with solid RC infill walls
In order to evaluate the fragility and collapse margin ratio of partially-restrained steel frame with solid reinforced concrete infill wall(PSRCW),four benchmark PSRCW structures were designed considering the effects of story number and seismic intensity.Considering the randomness of the mechanical properties of materials such as profile steel,concrete and steel bars and the geometric size of the thickness of RC infill wall,the Latin hypercube sampling method was used to expand to four groups of 160 PSRCW examples.By reasonably selecting 40 measured seismic records in Wenchuan area and randomly combining them with 40 PSRCW structural samples in each group,four groups of 40 earthquake-structure sample pairs were formed.Through the elastic-plastic time history analysis method,the seismic fragility curves of the PSRCW structure under the"elastic limit","full operation","operation","life safety","near collapse"and"collapse"states were determined,and the seismic performance evaluation was carried out to quantify the collapse reserve capacity of the PSRCW structure.The analysis results show that the CMR of the PSRCW structure is between 3.0 and 4.3,which has good seismic collapse resistance.
steel frameinfill wallfragility curvecollapse margin ratio
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