详情

原文传递 Self-Centering Hybrid GFRP-Steel Reinforced Concrete Beams for Blast Resilience

题名：	Self-Centering Hybrid GFRP-Steel Reinforced Concrete Beams for Blast Resilience
正文语种：	eng
作者：	Johnson, Jalen;Xu, Man;Jacques, Eric
作者单位：	Battelle Mem Inst Adv Mat & Energet Div Tyndall FL 32403 USA;Northeast Forestry Univ Dept Civil & Environm Engn 26 Hexing Rd Harbin 150040 Heilongjiang Peoples R China;Virginia Tech Charles E Via Jr Dept Civil & Environm Engn Blacksburg VA 24060 USA
关键词：	Reinforced concrete;Self-centering;Blast;High strain rate;Shock tube;Hybrid reinforced;Different fiber types such as glass (GFRP)
摘要：	Despite having a high strength-to-weight ratio and being chemically inert, fiber-reinforced polymer (FRP) reinforcing bars are not currently used in reinforced concrete protective design due to their brittle nature and lack of ductility. This paper presents research on the innovative use of blended mixtures of FRP and steel rebar to activate self-centering behavior to return blast-loaded elements to their original position after the inertial loads are removed. Self-centering blast-resilient members promise reductions in residual damage, repair cost, and facility downtime after a terrorist bomb attack or accidental explosion. Large-scale reinforced concrete beams with different combinations of steel and glass FRP (GFRP) rebar were designed, constructed, and tested under progressively increasing blast loads generated by the Virginia Tech Shock Tube Research Facility. The results demonstrated that beams with hybrid reinforcing experienced reduced overall residual damage in comparison with similar conventionally reinforced concrete members. Increasing the self-centering ratio (SC) of beams, defined as the ratio of the restoring moment provided by the FRP to the resisting moment provided by energy dissipating steel rebar, increased the blast self-centering tendencies of the hybrid beams. Additionally, if the GFRP rebar ruptured during the blast, the presence of steel prevented a brittle failure mechanism and provided additional energy dissipation and redundancy. To encourage the use of hybrid FRP-steel reinforcement in blast-resistant construction, a series of protective design recommendations are made. Furthermore, a new response limit based on a blast self-centering index (BSI) is proposed to explicitly account for the residual damage state in the protective design process. (C) 2021 American Society of Civil Engineers.
出版年：	2021
期刊名称：	Journal of structural engineering
卷：	147
期：	7