自然科学版 英文版
自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 3    March 2017

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A simplified model to predict blast response of CFST columns
ZHANG Jun-hao(章峻豪)1, CHEN Bin(陈斌)2, JIANG Shi-yong(江世永)1

1. Department of Civil Engineering, Logistical Engineering University, Chongqing 401311, China;
2. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China

Abstract:In order to study the dynamic response of concrete-filled steel tube (CFST) columns against blast loads, a simplified model is established utilizing the equivalent single-degree-of-freedom (SDOF) method, which considers the non-uniform distribution of blast loads on real column and the axial load-bending moment (P-M) interaction of CFST columns. Results of the SDOF analysis compare well with the experimental data reported in open literature and the values from finite element modeling (FEM) using the program LS-DYNA. Further comparisons between the results of SDOF and FEM analysis show that the proposed model is effective to predict the dynamic response of CFST columns with different blast conditions and column details. Also, it is found that the maximum responses of the columns are overestimated when ignoring the non-uniformity of blast loads, and that neglecting the effect of P-M interaction underestimates the maximum response of the columns with large axial load ratio against close range blast. The proposed SDOF model can be used in the design of the blast-loaded CFST columns.

 

Key words: concrete-filled steel tube (CFST) columns; dynamic response; single-degree-of-freedom (SDOF) analysis; non-uniform blast loads; axial load-bending moment (P-M) interaction

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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