Technical Papers
Jun 10, 2016

Response Analysis of Reinforced Concrete Block Infill Panels under Blast

Publication: Journal of Performance of Constructed Facilities
Volume 30, Issue 6

Abstract

Increased exposure to the detrimental effects of blast events has led to the release of several guidelines and the recent publication of two North American standards that provide guidance on the hardening and performance quantification of structures subjected to this type of loading. The safety and security logistics and the high cost associated with performing experimental blast testing has led to a number of codes and guidelines accepting the use of simplified dynamic modeling techniques to analyze the response of structural components. Past research in blast-masonry interaction has primarily focused on the strengthening and retrofit of existing unreinforced masonry wall systems, whereas research related to evaluating the blast response of reinforced masonry (RM) has been limited. The focus of this study is to evaluate the accuracy of using simplified dynamic modeling techniques to predict the blast performance of nonintegral RM infill walls. To evaluate the accuracy of the simplified dynamic models, the predicted response values are compared with results obtained from experimental blast testing of RM infill walls that cover a range of wall design parameters, charge weights, and standoff distances. The combinations of charge weights and standoff distance presented a range of scaled-distances, reflecting different explosive threat levels, which were selected to induce different damage levels in the RM walls. Results from this study indicate that the wall peak deflection response can be accurately predicted using the simplified dynamic models, which was used to generate RM infill wall performance charts for a range of reinforcement ratios. Additionally, it was found that the complex response of the nonintegral infill walls investigated in this study is bounded by two common boundary configurations as verified by further analyses. The analysis results are expected to provide a better understanding of RM infill wall performance under blast loads and the performance charts can be used as a screening tool for existing walls and preliminary design of new construction under different design-basis threat (DBT) levels.

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Acknowledgments

This research was facilitated with funding provided by the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canadian Concrete Masonry Producers Association (CCMPA), and the Canada Masonry Design Centre (CMDC). Additional funding was provided by the McMaster University Centre for Effective Design of Structures (CEDS), funded through the Ontario Research and Development Challenge Fund (ORDCF). The authors are very grateful to the members of the Canadian Explosives Research Laboratory (CERL), who conducted the field blast tests, and to the Canadian Forces for providing the test range.

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Go to Journal of Performance of Constructed Facilities
Journal of Performance of Constructed Facilities
Volume 30Issue 6December 2016

History

Received: Apr 23, 2014
Accepted: Jul 20, 2015
Published online: Jun 10, 2016
Discussion open until: Nov 10, 2016
Published in print: Dec 1, 2016

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Authors

Affiliations

Nicholas L. Smith [email protected]
Graduate Student, Dept. of Civil Engineering, McMaster Univ., Hamilton, ON, Canada L8S 4L7. E-mail: [email protected]
Michael J. Tait, M.ASCE [email protected]
Joe Ng/JNE Consulting Chair in Design, Construction and Management in Infrastructure Renewal, Co-Director, Centre for Effective Design of Structures, Dept. of Civil Engineering, McMaster Univ., Hamilton, ON, Canada L8S 4L7. E-mail: [email protected]
Wael W. El-Dakhakhni, F.ASCE [email protected]
Martini, Mascarin and George Chair in Masonry Design, Co-Director, Centre for Effective Design of Structures, Dept. of Civil Engineering, McMaster Univ., Hamilton, ON, Canada L8S 4L7 (corresponding author). E-mail: [email protected]
Waleed F. Mekky [email protected]
Section Manager, Stress Analysis, AMEC NSS, Toronto, ON, Canada M5G 1X6. E-mail: [email protected]

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