Seismic response analysis of two long-span hangars under multiple support excitations

Multiple support earthquake excitation time history analyses of Beijing A380 hangar structure at Capital International Airport and the general assembly building structure at Xi'an Airplane were performed. The results were compared with these of the uniform support excitation. The effects of multiple support excitation, wave propagation velocity and earthquake input on the internal force of roof structural elements were evaluated. The results indicate: the structure form has a substantial effect on the member internal forces under multiple support excitation; chord members at the middle story of the roof space frame have large wave traveling effect factor; under the different earthquake input, the locations of members with relatively large wave traveling effect factor are not always the same, but the distribution pattern of the member number is about the same. The analysis results are significant for taking account of the effects of multiple support excitations in the earthquake resistant design of the long-span hangar structures.