Notes about calculation models for seismic analysis of long-span isolated structure under multi-point earthquake excitations.

There may be some obvious error in long-span isolated structures' seismic responses calculated by multi-point earthquake calculation models. In this paper error reason and corresponding solution methods are given. Firstly, several main calculation models for seismic analysis of long-span isolated structures under multi-point earthquake excitations are described, and their mechanisms and features are also explained by rigorous theoretical derivation. Then, theoretical defects and error of displacement model are especially pointed out, which would lead to wrong results if arbitrarily utilized in long-span isolated structures. Furthermore, some modification and theoretical basis are given. Finally, a multiple degrees of freedom simple model and a teal long-span space truss structure of hangar are given as numerical example, and viewpoints and suggestions in this paper are verified. The displacement mode inherent in SAP2000 software is applicable in seismic response calculation of structure under multi-point earthquake excitations. [ABSTRACT FROM AUTHOR]