Application of static elastoplastic analysis in the design of long-span steel structures

static elastoplastic analysis;  target displacement;  ultimate bearing capacity;  Large span steel structure

Using the large-scale general finite element program SAP2000, the spatial finite element calculation model of the steel structure of the string support dome roof of Anhui University gymnasium was established. According to the basic principle of static elastoplastic (Push-over) analysis, the elastoplastic ultimate bearing capacity of the roof steel structure under the combination of the two most unfavorable working conditions is calculated in detail. The calculation results show that the Push-over analysis method can find out the weak part of the structure where the plastic hinge first appears, and obtain the nonlinear load-displacement curve of the structure. Under the combination of the most unfavorable load conditions, it can be calculated that the elastoplastic ultimate bearing safety factor of the roof steel structure is 2.33, and the structure meets the safety requirements.