|Table of Contents|

Numerical Simulation on External Explosion Experiments of Two-story Single-span Scaled RC Frame Structure(PDF)

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

Issue:
2022年03期
Page:
111-126
Research Field:
Publishing date:

Info

Title:
Numerical Simulation on External Explosion Experiments of Two-story Single-span Scaled RC Frame Structure
Author(s):
WU Hao;  LIN Cheng
(College of Civil Engineering, Tongji University, Shanghai 200092, China)
Keywords:
RC frame structure;  infilled wall;  blast load;  dynamic response;  finite element analysis;  numerical simulation
PACS:
TU375.4
DOI:
10.19815/j.jace.2021.07016
Abstract:
Based on the existing quarter-scale reinforced concrete(RC)frame structure explosion experiments, the refined finite element model was established by LS-DYNA to analyze the dynamic response of the open frame, the infilled frames with and without opening and parking garage. The numerical simulation blast wave reflected overpressure, impulse, as well as the local and overall responses of the structure were compared with experimental results. The results show that the finite element model can well predict the propagation of blast waves and structural response when the mesh sizes of air and TNT adopt 50 mm×50 mm. The overpressure in front of the column has a gradient distribution that decreases from bottom to top. The simulated impulse on the middle column agrees well with the experimental data, and there is also a gradient distribution in front of the column, while a significant impulse increase appears near the floor and infilled wall in the back. The failure mode of lower column is consistent with the experiment, and the deviations between simulated and experimental mid-span displacement are less than 5%. The infilled wall can prevent blast waves entering the structure, but significantly increase the loads on the middle column and pressure difference between the upper and lower surface of lower level floor. The accuracy and applicability of numerical simulation method, mesh size, material models and parameter values are verified by comparing the simulated results and experimental results, which can provide a useful reference for the further study on anti-blast response and collapse analysis of RC frame structure.

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Last Update: 2022-05-30