Dynamic Elasto-Plastic Analysis on the Steel Spatial Arch Truss with 90m Span under Earthquake

Abstract

In this paper, the elasto-plastic dynamic analysis on the steel spatial arch truss with 90m span and 0.4 rise-span ratio is carried out under earthquake EL-Centro wave with SAP2000. In the analyses, the geometric and material nonlinear effects are considered at the same time based on the plastic-hinge theory. Under the action of EL wave with the peak increasing gradually, its elasto-plastic dynamic responses have been obtained. All the results displays its failure mode under the earthquake action is elasto-plastic dynamic buckling; that its critical peak acceleration of EL earthquake wave when applied in X direction is 381gal, and is 583gal when applied in Z direction; The ratio of its maximal node horizontal and its structural height is 1/290, and its displacement ductility coefficient is 1.43 and the ratio of its bars with plastic hinge appearing when buckling is 3.00% when EL-Centro waves applied on structure in X direction; The ratio of its maximal node vertical and its structural span is 1/567, and its displacement ductility coefficient is 1.48 and the ratio of its bars with plastic hinge appearing when buckling is 2.50% when EL-Centro waves applied in Z direction.