摘要
为研究聚脲涂层对钢筋混凝土(reinforced concrete,RC)基板层裂和贯穿的影响,分析了压缩波在混凝土-聚脲界面传播过程及混凝土层裂过程,提出了背面喷涂聚脲RC基板的层裂解析模型。基于该模型,定量分析了聚脲涂层对RC基板临界层裂和贯穿的影响,提出无涂层RC板的贯穿预估经验方法可扩展应用于背面喷涂聚脲的RC基板,并通过学者们报道的接触爆炸试验进行验证。结果表明:聚脲涂层会对RC基板背面层裂过程产生影响,紧邻混凝土-聚脲界面的净应力波为压缩波,而在更深处的混凝土中,净应力波为拉伸波;聚脲涂层仅影响RC基板的首次层裂,首次层裂后的层裂过程与无涂层RC板相同;在发生临界层裂时,聚脲涂层提高了RC基板的临界层裂抗力,但层裂深度会增大;在发生贯穿时,聚脲涂层减少了RC基板的层裂次数,但对总层裂深度和贯穿的影响较小;无涂层RC板的贯穿预估经验方法可较好地预估背面喷涂聚脲RC基板的贯穿破坏。
In recent years,polyurea-coated reinforced concrete(RC)slabs have been extensively studied both experimentally and numerically for structural strengthening against contact explosions.However,theoretical investigations remain limited particularly concerning the impact of polyurea on the local damages of the RC substrates.In this paper,an analytical model based on stress wave propagation theory was proposed to investigate the reflection of compression waves at the backside of the RC substrate slab and predict the spalling depth.Utilizing this analytical model,a quantitative and detailed discussion was presented regarding the effect of the polyurea on the critical spalling and breach of the RC substrate slab.Furthermore,the applicability of the empirical breach prediction,originally developed for uncoated RC slabs,was validated through existing experiments to predict the breach of polyurea-coated RC substrate slabs.The results indicate that polyurea affects the spalling process of the RC substrate slabs.Specifically,the net stress wave adjacent to the concrete-polyurea interface is a compression wave,while it transitions to a tensile wave in the deeper concrete.Polyurea primarily impacts the first spall of the RC substrate slab;subsequent spalling processes after the first spall align with those observed in uncoated RC slabs.Upon the occurrence of critical spalling,polyurea enhances the critical spalling resistance of RC slabs,although it significantly increases the spalling depth.Conversely,when a breach occurs,polyurea reduces the number of spalls but minimally affects on the total spalling depth.Based on these findings,the empirical method for predicting breaches of uncoated RC slabs can effectively be applied to predict the breach of RC substrate slabs coated with polyurea.The test results from more than twenty contact explosion experiments are consistent with the predicted outcomes,thereby validating the effectiveness of the analytical model and providing a method for estimating the breach of polyurea-coated RC substrate slabs.
作者
郭士旭
何翔
刘飞
杨建超
陈经
孙山川
GUO Shixu;HE Xiang;LIU Fei;YANG Jianchao;CHEN Jing;SUN Shanchuan(Defense Engineering Institute,AMS,PLA,Beijing 100036,China;School of Intelligent Construction and Civil Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,Henan,China;State Key Laboratory of Target Vulnerability Assessment,Luoyang 471023,Henan,China)
出处
《爆炸与冲击》
北大核心
2025年第12期164-176,共13页
Explosion and Shock Waves
基金
中原科技创新领军人才项目(234200510016)。
关键词
接触爆炸
钢筋混凝土板
聚脲涂层
抗爆性能
解析模型
层裂
贯穿
contact explosion
reinforced concrete slab
polyurea coating
anti-blast performance
analytical model
spall
breach
