GFRP后锚固混凝土板抗爆性能及损伤评估研究  

Research on blast resistance performance and damage assessment of GFRP post anchored concrete slabs

作　　者：霍文龙 王枭华 HUO Wenlong;WANG Xiaohua(State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300350,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学水利工程智能建设与运维全国重点实验室,天津300350 [2]天津大学建筑工程学院,天津300350

出　　处：《河海大学学报(自然科学版)》2025年第2期88-97,共10页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金项目(52109163)。

摘　　要：采用数值模拟方法,借助ANSYS/LS-DYNA软件建立了GFRP后锚固混凝土板有限元数值模型,并结合已有物理试验结果验证了任意Lagrange-Euler(ALE)算法的有效性,分析比较了共节点方式、CONSTRAIN_BEAM_IN_SOLID模型和CONTACT_1D模型模拟黏结滑移行为的差异,揭示了不同黏结滑移模式模拟的GFRP后锚固混凝土板的破坏机理,探讨了GFRP配筋率、板厚和TNT当量对GFRP后锚固混凝土板破坏模式的影响及混凝土板失效体积率和能耗分摊率的变化规律,并构建了GFRP后锚固混凝土板的损伤分级预测曲线。结果表明:ALE算法可以较好地模拟GFRP筋后锚固混凝土板的爆炸过程;不同黏结滑移模式模拟的GFRP后锚固混凝土板的破坏过程及破坏机理相似,但最终破坏模式不同;提高GFRP配筋率和混凝土板的厚度可以有效地降低GFRP筋的轴向力、混凝土板的失效体积率,提高混凝土板的能量分摊率及其整体抗爆承载能力;损伤分级预测曲线可用于评估TNT当量和板厚的变化对损伤的影响。This paper presents a finite element numerical model of GFRP post anchored concrete slabs(GFRP-PACS)using ANSYS/LS-DYNA software and the Arbitrary Lagrange-Euler(ALE)algorithm’s effectiveness is validated through physics experiment results.A comparative analysis of bond-slip behavior simulations among the share node,CONSTRAIN_BEAM_IN_SOLID and CONTACT_1D methods reveals distinct failure mechanisms under different models while maintaining similarity in the overall simulation process.The study investigates the effects of GFRP reinforcement ratio,concrete slab thickness,and TNT weights on the failure mode,failure volume rate,energy sharing rate,and blast resistance bearing capacity of GFRP-PACS.A damage grading prediction curve for GFRP-PACS is established to assess the impact of material parameters on structural performance.The results indicate that the ALE algorithm can effectively simulate the explosion process of GFRP-PACS.While simulations using different bond-slip models exhibit similar failure processes,they yield distinct final failure modes.Increasing the reinforcement ratio and the thickness of the concrete slab can effectively reduce the axial force in the GFRP bar,and the failure volume rate of the concrete slab,and improve the energy sharing rate and overall blast resistance bearing capacity of the concrete slab.The damage grading prediction curve can assess the impact of changes in TNT weight and slab thickness on the damage.

关 键 词：混凝土板 GFRP筋 后锚固 抗爆性能 损伤评估 

分 类 号：TV312[水利工程—水工结构工程]