超高性能混凝土(UHPC)作为一种新型抗爆防护材料的工程应用日益广泛。然而,关于水下接触爆炸作用下UHPC板的毁伤特性研究仍较为匮乏。通过水下爆炸试验与数值模拟相结合的方法,开展0.3 kg TNT当量下UHPC板的水下接触爆炸试验,并设计7种...超高性能混凝土(UHPC)作为一种新型抗爆防护材料的工程应用日益广泛。然而,关于水下接触爆炸作用下UHPC板的毁伤特性研究仍较为匮乏。通过水下爆炸试验与数值模拟相结合的方法,开展0.3 kg TNT当量下UHPC板的水下接触爆炸试验,并设计7种不同工况的数值仿真分析,系统探究UHPC板的毁伤演化规律与动态响应特征。研究结果表明:相比空气中接触爆炸,水下接触爆炸荷载作用下,冲击波呈现压力更高、作用时间更长的传播特性,UHPC板表现出典型的环形破坏特征;水下接触爆炸使靶板的动态响应更为显著,入射波压力峰值、加速度峰值相比空气爆炸工况均有提升;相比普通钢筋混凝土(RC)板,UHPC板在水下接触爆炸的动态响应较小,RC板测点的动能峰值约为UHPC板的1.45倍。展开更多
To promote the application of green recycled construction materials in civil engineering,this study presents a statistical damage constitutive model for polypropylene fiber recycled fine aggregate concrete(PRFAC),base...To promote the application of green recycled construction materials in civil engineering,this study presents a statistical damage constitutive model for polypropylene fiber recycled fine aggregate concrete(PRFAC),based on the strain equivalence principle and the assumption that microelement strength follows a Weibull statistical distribution.The proposed model incorporates the Drucker-Prager failure criterion.By examining the influence of Weibull distribution parameters m and S_(0)on the stress-strain response,empirical relationships were established between the fine aggregate replacement ratio and the distribution parameters.This enabled the derivation of a theoretical stress-strain curve accounting for variable recycled fine aggragate(RFA)replacement ratios.The experimental results show that the proposed model exhibits high agreement with measured data and effectively captures the increased brittleness of PRFAC with higher RFA replacement ratios.Moreover,increasing the replacement rate accelerates internal crack propagation,reduces deformability and toughness,and significantly hastens the accumulation of internal damage in PRFAC.展开更多
文摘超高性能混凝土(UHPC)作为一种新型抗爆防护材料的工程应用日益广泛。然而,关于水下接触爆炸作用下UHPC板的毁伤特性研究仍较为匮乏。通过水下爆炸试验与数值模拟相结合的方法,开展0.3 kg TNT当量下UHPC板的水下接触爆炸试验,并设计7种不同工况的数值仿真分析,系统探究UHPC板的毁伤演化规律与动态响应特征。研究结果表明:相比空气中接触爆炸,水下接触爆炸荷载作用下,冲击波呈现压力更高、作用时间更长的传播特性,UHPC板表现出典型的环形破坏特征;水下接触爆炸使靶板的动态响应更为显著,入射波压力峰值、加速度峰值相比空气爆炸工况均有提升;相比普通钢筋混凝土(RC)板,UHPC板在水下接触爆炸的动态响应较小,RC板测点的动能峰值约为UHPC板的1.45倍。
基金The National Natural Science Foundation of China(No.52168022).
文摘To promote the application of green recycled construction materials in civil engineering,this study presents a statistical damage constitutive model for polypropylene fiber recycled fine aggregate concrete(PRFAC),based on the strain equivalence principle and the assumption that microelement strength follows a Weibull statistical distribution.The proposed model incorporates the Drucker-Prager failure criterion.By examining the influence of Weibull distribution parameters m and S_(0)on the stress-strain response,empirical relationships were established between the fine aggregate replacement ratio and the distribution parameters.This enabled the derivation of a theoretical stress-strain curve accounting for variable recycled fine aggragate(RFA)replacement ratios.The experimental results show that the proposed model exhibits high agreement with measured data and effectively captures the increased brittleness of PRFAC with higher RFA replacement ratios.Moreover,increasing the replacement rate accelerates internal crack propagation,reduces deformability and toughness,and significantly hastens the accumulation of internal damage in PRFAC.
