摘要
为提高爆炸荷载下FRP-混凝土类梁式构件数值模拟计算效率,提出了爆炸荷载下FRP-混凝土搭接接头精细有限元数值模拟方案。总结已有的不同种类的FRP-混凝土搭接接头在不同荷载条件下的破坏模态和FRP-混凝土界面黏结性能,提出了爆炸荷载下FRP-混凝土修正梁式弯曲搭接接头的基本构造及尺寸,即由两个长500 mm、宽100 mm、高150 mm、圆柱体抗压强度54.4 MPa的混凝土块体,并在底部铰接,在混凝土顶部黏结了一块弹性模量30 GPa、长450 mm、宽100 mm、厚3.0 mm的GFRP板。采用上述FRP-混凝土修正梁式弯曲搭接接头,在爆炸比例距离Z≥1.2 m/kg^(1/3)和爆高跨度比a≥0.5条件下,得到了FRP-混凝土界面在爆炸荷载下发生类似中部弯曲裂缝引起的界面剥离破坏模态(IC Debonding)时FRP实际应力界限范围为[180.1,583.3]MPa;提出爆炸荷载下纵向尺寸1.0 m的修正梁式弯曲搭接接头FRP-混凝土界面发生类IC Debonding的等损伤线压力-冲量(P-I)曲线和P、I同炸药当量W、爆炸距离R、爆炸比例距离Z的经验公式,用于爆炸荷载下FRP-混凝土类梁式构件的数值模拟。
To enhance the numerical simulation efficiency of FRP-concrete beam components under blast loads,a meso-scale numerical simulation scheme for FRP-concrete joints under blast is proposed.Based on the failure modes and bond-slip behavior of FRP-concrete interface for different FRP-concrete joints under various loading conditions in previous research,a modified configuration and dimension of FRP-concrete bending joint under blast is designed.The joint consists of two concrete beams with dimensions of 500mm in length,100mm in width,and 150mm in height,with a compressive strength of 54.4MPa.The beams are hinged at the bottom,and a GFRP plate with an elastic modulus of 30GPa,dimensions of 450mm in length,100mm in width,and 3.0mm in thickness,is bonded to the top surface of the concrete specimen.Employing the modified FRP-concrete bending joint,and under the condition of scaled distance Z≥1.2m/kg^(1/3) and distance span ratio a≥0.5,the actual stress range of the FRP at an interface debonding failure mode similar to intermediate crack-induced debonding(IC Debonding)is[180.1,583.3]MPa.Pressure-impulse(P-I)curve and empirical formula of P,I,explosive equivalent weight W,explosion distance R,and scaled distance Z for the modified FRP-concrete bending joint under blast of which the length is 1.0m in longitudinal direction are proposed,which can be used for numerical simulation of FRP-concrete beam components under explosive loading conditions.
作者
李晓琴
张莉
廖俊智
陈建飞
陆勇
何勇
LI Xiaoqin;ZHANG Li;LIAO Junzhi;CHEN Jianfei;LU Yong;HE Yong(Faculty of Civil Engineering,Kunming University of Science and Technology,Kunming 650500,China;Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China;Institute for Infrastructure and Environment,School of Engineering,University of Edinburgh,Edinburgh EH93JL,UK)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2024年第4期226-236,共11页
Journal of Building Structures
基金
国家自然科学基金项目(52168029,51968035)
云南省万人计划青年拔尖人才项目(云人社通[2020]150号YNWR-QNBJ-2020-049)。
