Dynamic Elasto-Plastic Analysis on the Steel Spatial Arch Truss with 60m Span and 0.1 Rise-Span Ratio

Abstract

In this paper, the elasto-plastic dynamic analysis on the steel spatial arch truss with 60m span and 0.1 rise-span ratio is carried out under earthquake 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. The results show that its failure mode under the earthquake action is elasto-plastic dynamic buckling; that its critical peak acceleration of EL earthquake wave when applied in horizontally direction is 678gal, and is 624gal when applied in vertically direction; The ratio of its maximal node horizontal and its structural height is 1/961, and its displacement ductility coefficient is 1.14 and the ratio of its bars with plastic hinge appearing when buckling is 2.15% when EL-Centro waves applied on structure in X direction; The ratio of its maximal node vertical and its structural span is 1/660, and its displacement ductility coefficient is 1.17 and the ratio of its bars with plastic hinge appearing when buckling is 6.09% when EL-Centro waves applied in Z direction.