Method for Evaluating the Progressive Collapse Resistance of Long-Span Single-Layer Spatial Grid Structures

Abstract

In recent years, researchers have increasingly reported the progressive collapse of long-span spatial grid structures. However, research on long-span spatial grid structures, especially single-layer spatial grid structures, remains limited. Thus, this study conducted an incremental dynamic analysis to develop a suitable method for evaluating single-layer spatial grid structures. The method uses a quantitative evaluation index called the collapse margin ratio. Engineering cases were analysed to validate the proposed method. For instance, the proposed method was used to evaluate the progressive collapse of the main stadium of the Shenzhen Universiade Sports Centre. The results showed that the roof of the structure has good resistance against progressive collapse from the perspective of quantitative analysis, even though the cantilever length reached 51.9-68.4 m at some locations, and the novel method is not restricted by the structural form. Thus, the method can be used to quantitatively evaluate a structure's resistance to collapse.

Application of Sensitivity Analysis to Progressive Collapse Resistance of Planar Truss Structures

“…Most current studies on progressive collapse focus on frame structures [1][2][3], and relatively few studies focus on large-span space structures. However, with the wide application of space structures, progressive collapse accidents occur frequently [4,5]. Such structures are generally used in densely populated public buildings, so the progressive collapse study of large-span space constructions is necessary.…”

Robustness Analysis and Important Element Evaluation Method of Truss Structures

“…Li et al [31] proposed a new method for quantifying robustness, considering the dynamic effects and the plastic internal force redistribution within a frame structure. A suitable method for evaluating single-layer grid structures by incremental dynamic analysis, using a quantitative evaluation index called the collapse margin ratio, was established [32]. Yan et al [33] proposed a method to identify the critical members of single-layer lattice domes, using an index that implicitly estimates the relative vulnerability to node buckling with a member removal.…”