|Table of Contents|

Anti-progressive Collapse Mechanism of Composite Beam-column Substructure with Partial Boundary Constraints(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年03期
Page:
45-54
Research Field:
Publishing date:

Info

Title:
Anti-progressive Collapse Mechanism of Composite Beam-column Substructure with Partial Boundary Constraints
Author(s):
ZHONG Wei-hui1; 2;  DUAN Shi-chao1;  GAO Di1;  TAN Zheng1
(1. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 2. Key Lab of Structural Engineering and Earthquake Resistance of Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China)
Keywords:
progressive collapse;  numerical simulation;  beam-column substructure;  lateral stiffness;  size of side column
PACS:
TU398.9
DOI:
10.19815/j.jace.2021.09111
Abstract:
In order to investigate the anti-progressive collapse mechanism of composite beam-column substructure with partial boundary constraints, numerical simulation was carried out. The refined numerical model of a 1:3 scaled partial boundary constrained composite beam-column substructure specimen was established based on the ABAQUS software. The model calculation results were in good agreement with the test results, which verified the correctness of the finite element modeling method. On the basis, a full-scale model was established to analyze the influence of the lateral stiffness of the boundary constraint, the size of the side column, and the axial compression ratio of the side column on the anti-progressive collapse performance of the composite beam-column substructure with partial peripheral constraints. The results show that the lateral stiffness of the boundary restraint has a significant influence on the anti-progressive collapse performance of the composite beam-column substructure when the spring restraint coefficient n<1 and the anti-progressive collapse performance of the substructure is effectively improved when increasing the lateral restraint stiffness of the beam-column substructure. The increase in the lateral restraint stiffness has little influence on the anti-progressive collapse performance of the composite beam-column substructure when the spring restraint coefficient n>1. Too large or too small side column size is not conducive to the performance of the anti-progressive collapse performance of the composite beam-column substructure. The larger the side column size, the better the anti-progressive collapse performance of the substructure and the catenary mechanism when the beam-column stiffness ratio is between 0.6-1.1. The side column axial compression ratio has little effect on the proportion of different mechanism resistance, but it can affect the bearing capacity of the composite beam-column substructure. The composite beam-column substructure exerts the best anti-progressive collapse performance when the side column axial compression ratio is 0.3.

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Last Update: 2022-05-30