View in EDS

Damage Mode and Structural Response of SCS Sandwich Beams with Lacing Bars Subjected to Near-Field Explosions.

Saved in:
Bibliographic Details
Title: Damage Mode and Structural Response of SCS Sandwich Beams with Lacing Bars Subjected to Near-Field Explosions.
Authors: Liang, Shi-Lin1 (AUTHOR) liangshilin@st.gxu.edu.cn, Yu, Jun2 (AUTHOR) junyu@seu.edu.cn, Zhang, Guo-Kai3 (AUTHOR) gkzhang@njust.edu.cn
Source: Journal of Structural Engineering. Dec2025, Vol. 151 Issue 12, p1-16. 16p.
Subjects: Sandwich construction (Materials), Shear strength, Structural failures, Bracing (Structural engineering), Structural dynamics, Detonation waves, Numerical analysis
Abstract: In this paper, a novel lacing system was used for steel–concrete–steel (SCS) sandwich walls to resist near-field explosions. To study the performance of laced SCS sandwich walls under near-field explosions, five wall strips were extracted from a wall as beam specimens for conducting field blast tests. Test results indicated that SCS sandwich beams showed combined global and local damage under near-field explosions. The beam specimen without lacing bars kept global integrity under a scaled distance of Z=0.4 m/kg1/3 , although the concrete core was prone to spalling, and thin shear cracks formed. However, severe spalling and shear failure of concrete occurred as Z was decreased from 0.4 to 0.2 m/kg1/3. Adding lacing bars as shear connectors could effectively improve the blast resistance of the beam specimens. The lacing bars increased the out-of-plane shear strength of the specimens and provided interlock action to the faceplates, thereby enhancing the integrity of the specimens. Increasing web reinforcement ratio slightly decreased the deflection of the specimen. Decreasing longitudinal reinforcement ratio ρ significantly increased the deflection of the specimen. Numerical study was performed with LS-DYNA to further investigate the effects of Z and ρ on blast responses of laced SCS sandwich beams. Finally, a single degree of freedom model that is capable of considering combined global and local damage was proposed to predict the displacement response of laced SCS sandwich beams under near-field blast loading. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Structural Engineering is the property of American Society of Civil Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:In this paper, a novel lacing system was used for steel–concrete–steel (SCS) sandwich walls to resist near-field explosions. To study the performance of laced SCS sandwich walls under near-field explosions, five wall strips were extracted from a wall as beam specimens for conducting field blast tests. Test results indicated that SCS sandwich beams showed combined global and local damage under near-field explosions. The beam specimen without lacing bars kept global integrity under a scaled distance of Z=0.4 m/kg1/3 , although the concrete core was prone to spalling, and thin shear cracks formed. However, severe spalling and shear failure of concrete occurred as Z was decreased from 0.4 to 0.2 m/kg1/3. Adding lacing bars as shear connectors could effectively improve the blast resistance of the beam specimens. The lacing bars increased the out-of-plane shear strength of the specimens and provided interlock action to the faceplates, thereby enhancing the integrity of the specimens. Increasing web reinforcement ratio slightly decreased the deflection of the specimen. Decreasing longitudinal reinforcement ratio ρ significantly increased the deflection of the specimen. Numerical study was performed with LS-DYNA to further investigate the effects of Z and ρ on blast responses of laced SCS sandwich beams. Finally, a single degree of freedom model that is capable of considering combined global and local damage was proposed to predict the displacement response of laced SCS sandwich beams under near-field blast loading. [ABSTRACT FROM AUTHOR]
ISSN:07339445
DOI:10.1061/JSENDH.STENG-15169