Abstract

Info

Title:: Research on Progressive Collapse Mechanism of Multi-layered Frame Structure Under Blast Impact in Internal of Basement

Author(s):: TIAN Li; FAN Qi-hua; School of Civil Engineering, Tianjin University

Keywords:: frame structure; internal of basement; blast load; progressive collapse; soil interaction; separate model

Abstract:: In order to study progressive collapse characteristics of frame structure in the basement under internal explosion, a finite element explicit dynamic analysis software LS-DYNA was used to build a four-story frame structure separate model with a single basement. With considering common node connections of reinforcement and concrete, three-stage simulation method was used to analyze and compare progressive collapse modes in different blast load positions. The concrete failure modes of main components, such as beam, slab, column, etc. were analyzed, and the different collapse mechanisms of basement structure under blast load were presented. The results show that serious damage occurs in the first floor after the explosion in the internal of basement, and the explosion of underground structure near the column causes the structural nodes seriously damage and collapses finally.