Energy-Based Analysis of Anti-Seismic Performance of Latticed Shell in Coordination

An analytical numerical model was rebuilt to reveal changes in local stress state in a single-layer reticulated shell under earthquake, as well as the relationship between the changes and structural failure loads. The numerical model was rebuilt based on the strain energy from nonlinear response history analyses at increasing levels of ground motion intensity to systematically study the redistribution of seismic internal force in elements in the single-layer reticulated shell by using the strain energy parameter. The results showed that elements in a single-layer shell can bear seismic loads harmoniously and steadily in the normal working state. However, harmonious and steady characteristics were not observed in the failure state. Therefore, different stress states can be distinguished by checking the structural coordinative working capability. In addition, the strain energy in the lower parts of the single-layer reticulated shell was larger than that in other parts such as in the radial members under horizontal ground motion, the maximum value was observed in the fifth hoop, which was 13 times larger than that in the first hoop. The strain energy in the upper parts of the single-layer reticulated shell was larger than that in other parts such as in the radial members under 3D ground motion; the maximum value was observed in the second hoop, which was 15 times than that in the sixth hoop.