RESEARCH ARTICLE
Dynamic Responses of RPC-Filled Steel Tubular Columns Post Fire Under Blast Loading
Jinghai Wang, Wanxiang Chen*, Zhikun Guo, Wenguang Liang
Article Information
Identifiers and Pagination:
Year: 2016Volume: 10
First Page: 236
Last Page: 245
Publisher ID: TOCIEJ-10-236
DOI: 10.2174/1874149501610010236
Article History:
Received Date: 26/05/2015Revision Received Date: 14/07/2015
Acceptance Date: 10/08/2015
Electronic publication date: 25/05/2016
Collection year: 2016
open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
Abstract
Blast-resistant capacities of 4 large scale circular Reactive Powder Concrete Filled Steel Tubular (RPC-FST) columns after exposure to fire are experimentally examined. The overpressures of shock wave, the deflections and strains of RPC-FST column specimens are recorded by advanced gauges. The influences of fire durations and scaled standoff distances of explosive charge on the dynamic behaviors and failure modes are discussed. It is shown that the RPC-FST columns remain excellent blast-resistant capacities after exposure to fire. RPC core column can be effectively confined by steel tube, but the blast-resistant capacities of RPC-FST columns are decreased as explosive charge or fire duration increased. The failure modes are transited from bending types to bending-shear types as explosive charge increased, and an obvious plastic hinge at mid-span section can be observed in the RPC-FST column with fire duration of 105min. It is also indicated that the maximum displacements of RPC-FST columns are more sensitive to fire duration than to explosive charge weight.