Seismic fragility analysis can accurately estimate seismic performance of a structure

to propose a method to study on the seismic fragility of space grid structure

the full-load field time-history analysis

parameter sensitivity analysis and seismic fragility analysis were carried out. The results show that space grid structure has a ductile damage with obvious signs. The responses of this kind of structure are more sensitive to steel yield strength

floor loads and ground motion records

which can be considered as random factors in subsequent analysis. The seismic damage index and damage grading standard

which are applicable to orthogonal pyramid space grid

were proposed based on the seismic response of whole process. According to the seismic fragility analysis

the probability of ensuring intactness at PGA=0.40g is 95%

while 79% at PGA=0.62g. The orthogonal pyramid space grid has a good seismic performance

which can largely ensure the seismic safety.