Dynamic response analysis of reticulated shells based on refined member model

To obtain the accurate dynamic response of a reticulated shell, the refined member model must be established which can simulate both tensile strengthening and compressive buckling. Based on the equivalent principle of energy consumption of hysteresis model, the equivalent Marshall model for the imperfect member loaded by the axial force was established. According to the parameter analysis, the influences of common parameter, including section parameters, the initial bending amplitude, the elastic modulus reduction factor and the slenderness ratio, on the coefficients of the equivalent Marshall model are discussed, and the calculation formulas of the equivalent coefficients were given. The shaking table test and finite element simulation were conducted on a scaled K6 reticulated shell model. The results show that the refined member model, based on the equivalent Marshall model, can accurately simulate the dynamic development of the force state of the component, and the average error of residual displacement between the calculation results and the test data is 13%, which is superior to traditional Marshall model and satisfies the accuracy requirement of the practical engineering application. Moreover, the member model without imperfection will overestimate the actual load-carrying capacity of the reticulated shell model. © 2020, Editorial Office of Journal of Building Structures. All right reserved.