Seismic Performance Analysis of Soil-Tunnel-Ground Buildings Considering the Fuzziness of Damage States

Based on the traditional structural vulnerability analysis framework, the structural vulnerability analysis method considering the fuzziness of the damage states is further proposed and the overall seismic response calculation model of soil-tunnel-ground buildings is established. The membership functions of triangle and quasi-normal shape are introduced to calculate the membership degree of the maximum inter-story displacement angle under different damage conditions to obtain the fuzzy failure probability under different earthquake intensity levels. The maximum likelihood estimation method is used to fit the calculation results and establish the ground-building vulnerability curve considering the fuzziness of the damage limit. The results are compared with the calculation results of soil-ground buildings. The analysis results show that the seismic vulnerability curve of ground buildings given by the fuzzy evaluation method is generally safer. Considering the fuzziness of the damage limit will increase the dispersion of the seismic vulnerability curve of the structure. Moreover, the selection of membership function type has negligible influence on the results of fuzzy seismic vulnerability analysis. The tunnel has a certain amplification effect on the ground-building damage.