Abstract

Info

Title:: Several Problems in Research on Progressive Collapse of Precast Concrete Frame Structures

Author(s):: ZHANG Wang-xi; CAO Ya-dong; College of Civil Engineering, Hunan University

Keywords:: precast concrete frame structure; progressive collapse; connection; load-bearing mechanism; robustness

Abstract:: Some noticeable problems in the study of progressive collapse of precast concrete frame structures were discussed. It was emphasized that the whole process of precast concrete frame sub-structures, the combination and transformation of the load-bearing mechanism, and the influence of slabs and spatial load-bearing mechanism should be considered. There were some differences in design method, the definition of collapse scope, load combination and acceptance criteria among different codes in China or abroad. The results show that the following differences between precast concrete frame structure and cast-in-place concrete structure are worth noting, such as the sources of initial defects, the relevance between the connection performance and the structural system, the meaning of “equivalent to cast-in-place concrete structure”, and the applicability of the existing design method. The contents and key points of progressive collapse of precast concrete frame structures should focus on the quantitative indexes of robustness, experiments on connections and sub-structures, numerical simulation, parameter analysis and design methods. The statement of these problems can provide a reference for researchers and designer.