Investigation of Vulnerability of Concrete Filled Steel Column Connections under Different Blast Scenarios

Document Type : Research Article


1 Ph.D Student, Zanjan Islamic Azad Univrsity

2 Department of Civil Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran

3 Assistant professor, Zanjan Islamic Azad univeristy

4 Assistant Professor, Garmsar University


Considering the increasing hostile and terroristic threats in the country, it is important to consider the passive defence criteria in structures. The desirable properties of steel and concrete can be used simultaneously to increase the strength of structural members. Concrete-filled steel tube columns (CFSTs) have been proposed as an efficient system in previous years. The main problem with using this type of column is how to connect the beam to such a column and extensive research has been done for seismic load scenarios. Despite the excellent resistance of these types of columns to the blast load, no comprehensive investigation has yet been conducted on the performance of beam-to-column joints under blast load. In this paper, the behavior of three types of beam-to-column connections under 5 blast scenarios is investigated. ABAQUS software was used to conduct the research. Verification was first performed using the results of an experimental study and a good agreement was observed. The behavior of beam-to-column blast-loaded connections was investigated using 16 different models using explicit nonlinear dynamic analysis. The results were compared in terms of stress, strain and damage contour as well as force, energy absorption, displacement, rotation and torsion diagrams. It was observed that the optimal connection where the connection was carried out as an extension of the beam inside the column, all parts of the column contributed to the load carrying and energy absorption and very good behavior was observed. In this case, the plastic joint in the beam is formed away from the column face.


Main Subjects

[1] Brown N. K., Kowalsky M., Nau J., Strain Limits for Concrete Filled Steel Tubes in Aashto Seismic Provisions, Report prepared for Alaska Department of Transportation & Public Facilities, North Carolina State University, 2013.
[2] Schneider SP, Alostaz YM. Experimental behavior connections to concrete-filled steel tubes, Journal of Construction Steel Research, 45(3): 321–52, 1998.
[3] Kang CH, Shin KJ, Oh YS, Moon TS, Hysteresis behavior of CFT column to H-beam connections with external T-stiffeners and penetrated elements. Engineering Structure, 23(9):1194–201, 2001.
[4] Cheng CT, Chung LL. Seismic performance of steel beams to concrete-filled steel tubular column connections, Journal of Construction Steel Research, 59(3):405–26, 2003.
[5] Ricles JM, Peng SW, Lu LW. Seismic behavior of composite concrete filled steel tube column-wide flange beammoment connections. Journal of Structural Engineering ASCE, 130 (2), 223–32, 2004.
[6] Du Y., Zhihua Chen, J.Y. Richard Liew, Ming-Xiang Xiong, Rectangular concrete-filled steel tubular beam-columns using high-strength steel: Experiments and design, Journal of Constructional Steel Research, Volume 131, Pages 1-18, 2017.
[7] Hao H., Predictions of Structural Response to Dynamic Loads of Different Loading Rates, International Journal of Protective Structures, Volume 6, 2015
[8] Alostaz Y., Schneider S., Analytical behavior of connections to concrete-filled steel tubes, Journal of Constructional Steel Research, Volume 40, Issue 2, Pages 95-127, 1996.
[9] Schneider S., Alostaz T., Experimental Behavior of Connections to Concrete-filled Steel Tubes, Journal of Constructional Steel Research, Volume 45, Issue 3, Pages 321-352, 1998.
[10] Wu L., Chung L., Tsai Sh., Shen T., Huang G., Seismic behavior of bolted beam-to-column connections for concrete filled steel tube, Journal of Constructional Steel Research, Volume 61, Issue 10, Pages 1387-1410, 2005.
[11] Fujikura Sh., Bruneau M., and Lopez-Garcia D., Experimental Investigation of Multihazard Resistant Bridge Piers Having Concrete-Filled Steel Tube under Blast Loading, Journal of Bridge Engineering, 586-594, ASCE , 2008.
[12] Sadrnejad A., Ziaei M., Behavior of the Bolted Beam-Column Connections under Blast, Passive Defence Sci. & Tech., 2, 93-101, 2013 (in Farsi).
[13] Zhang F., Wu Ch., Zhao X., Li Zh., Heidarpour A., and Wang H., Numerical Modeling of Concrete-Filled Double-Skin Steel Square Tubular Columns under Blast Loading, Journal of Performance of Constructed Facilities, Volume 29, Issue 5, 2015.
[14] Xu F., Chen J., Jin Wei-liang, Experimental investigation of concrete-filled steel tubular longitudinal gusset plate connections, Journal of Constructional Steel Research, Volume 124, Pages 163-172,
[15] Liu J., Yuanlong Yang, Jiepeng Liu, Xuhong Zhou, Experimental investigation of special-shaped concrete-filled steel tubular column to steel beam connections under cyclic loading, Engineering Structures, Volume 151, Pages 68-84, 2017.
[16] Xu M., Shan Gao, Sumei Zhang, Honghao Li, Experimental study on bolted CFST-column joints with different configurations in accommodating column-loss, Journal of Constructional Steel Research, Volume 151, Pages 122-131, 2018.
[17] Li M., Zong , Hao H., Zhang X., Lin J., Xie G., Experimental and numerical study on the behaviour of CFDST columns subjected to close-in blast loading, Engineering Structures, Volume 185, Pages 203-220, 2019.
[18] LS-DYNA keyword user's manual (LS-DYNA R8.0). Livermore, California: Livermore Software Technology Corporation, 2015.
[20] UFC3-340-2, UFC3-340-2, Structures to resist the effects of accidental explosions, Department of defense, United States of America, 2008.
[21] Kingery C.N., G. Bulmash, Air blast parameters from TNT spherical air burst and hemispherical surface burst, Report ARBL-TR-02555, U.S. Army BRL, Aberdeen Proving Ground, MD, 1984.
[22] Li B., Yuan-Long Yang, Yohchia-Frank Chen, Wei Cheng, Lin-Bo Zhang, Behavior of connections between square CFST columns and H-section steel beams, Journal of Constructional Steel Research, Volume 145, Pages 10-27, 2018
[23] Design guidance for shelters and safe rooms, Risk management series, FEMA-453, 2006.
[24] Ziaei M., Investigation on Behavior of Bolted Beam-to-Column Connections in Steel Frames under Blast Loading, Ph.D dissertation, K.N.Toosi university of Technology, Tehran, Iran, 2014.