LAYERED ANALYSIS OF RESISTANCE-DEFLECTION FUNCTION OF RC SLABS RETROFITTED WITH FRP
The design of RC slabs subjected to blast loads requires formulation of a resistance-deflection function. In the design codes such as TM5 and ASCE, a quasi-static resistance function modified by dynamic increase factors (DIF) is recommended. However, the DIF value is obtained by using averaged strain rates over a cross-section, even though the loading rate profile is not a constant over a cross-section. In this paper, a finite element program LSDYNA is used to investigate strain and strain rate distributions over a cross-section under blast loads. It is found that for varying blast loads, the maximum strain and strain rate profiles all remain very close to linear and the strain and strain rate profiles appear to pivot around the neutral axis. The linear strain and strain rate profiles over the cross-section are then applied in the layered analysis of the cross-section to determine the resistance-deflection function of a RC member. The derived resistance-deflection function plays a key role in performing the dynamic response analysis of RC slabs against blast loads using single-degree-freedom (SDOF) systems recommended by current guidelines such as TM5 and ASCE.
Cheng-Qing Wu Deric John Oehlers Craig Glynn
School of Civil and Environmental Engineering, The University of Adelaide, North Terrace, SA, 5005, Australia
国际会议
长沙
英文
1170-1176
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）