Numerical derivation of pressure-impulse diagrams for square UHPCFDST columns. (June 2017)

• Record Type: Journal Article
• Authors: Zhang, Fangrui; Wu, Chengqing; Zhao, Xiao-Ling; Li, Zhong-Xian
• Is Part Of: Thin-walled structures. Volume 115(2017)
• Page Start: 188
• Page End: 195
• Publication Date: 2017-06
• Subjects: CFDST -- UHPC -- Blast loading -- Pressure-impulse diagram; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2017.02.017
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: Terrorist activities, especially bomb attacks, have become more and more frequent in the past decades which put thousands of innocent lives in danger. The most common failure mode of structures subjected to blast loading is progressive collapse which is mainly resulted from the failure of load bearing columns. In this paper, finite element analysis tool, LS-DYNA is utilized to study the behaviours of ultra-high performance concrete filled double- skin steel tube (UHPCFDST) columns under blast loading. The numerical model is firstly validated against a series of laboratory and field tests and then used to derive pressure-impulse diagrams for UHPCFDST columns in terms of their residual axial load-carrying capacity after being subjected to blast loading. Different parameters are studied to investigate the effects of axial load ratio, steel tube thickness, column dimension and concrete strength on the pressure-impulse diagrams. Highlights: The numerical model for UHPC filled double-skin steel tube columns is firstly validated against a series of laboratory and field tests. The effects of axial load ratio, steel tube thickness, column dimension and concrete strength on the PI diagrams are investigated. Pressure-impulse diagrams for UHPCFDST columns after being subjected to blast loading are derived.