Seismic damage evolution of steel–concrete hybrid space-frame structures

• The seismic damage evolution of steel–concrete hybrid structures is studied.
• A damage model is developed using steel and concrete material models.
• Finite element analysis is conducted using the damage model.
• A scaled test model of a three-storey steel–concrete hybrid structure is tested.
• The fiber elements with steel and concrete damage models are verified by the test.

This paper presents a study on the seismic damage evolution and failure process of steel–concrete hybrid structures through simulation and tests. For steel members, the Krieg–Key constitutive model with a plasticity damage model is used to simulate the damage of steel. For concrete members, the improved Faria–Oliver model is adopted to analyze the damage of concrete. After that, these material models are assigned to fiber elements. The fiber element is adopted to establish a finite element model of steel–concrete hybrid structures. In order to evaluate the effectiveness of this modeling method, shaking table tests are conducted on a scaled test model of a three-storey steel–concrete hybrid structure. The test result shows that the proposed damage model and fiber elements are effective to simulate the seismic damage evolution and failure process of steel–concrete structures.