爆炸与冲击2023，Vol.43Issue(12)：123-138,16.DOI:10.11883/bzycj-2023-0160
爆炸荷载作用下UHPC板的弯曲损伤评估
Flexural damage assessment for UHPC panels under blast loadings
摘要
Abstract
To establish the p-I(pressure-impulse)diagram for flexural damage assessment of ultra-high performance concrete(UHPC)panels under blast loadings,cross-sectional analysis using the strip method was performed to establish the moment curvature relationship for simply supported one-way UHPC panels.This process involved considering the tensile/compressive softening of UHPC through the utilization of material constitutive models with softening properties and describing the strain rate effect of UHPC and reinforcement with the dynamic increase factor(DIF)that varies according to different strip layers.Subsequently,the nonlinear resistance function considering the effect of plastic hinge was developed,based on the moment curvature relationship and a simplified half-span symmetric beam model.Then,an equivalent single degree of freedom(ESDOF)theoretical model,adopting the nonlinear resistance function,was established and employed to predict the deflection-time histories of UHPC panels under explosions.The reliability of the above theoretical model was verified by comparing the predicted results with the deflection time histories of test UHPC panels in six shots of explosion tests.Additionally,the superiority of the proposed ESDOF model was proved by comparing with the corresponding calculation results obtained from the recommended methods using bilinear ideal elastic-plastic resistance functions based on the UFC 3-340-02 and FHWA codes.Furthermore,based on the verified ESDOF model,p-I diagrams for evaluating the flexural damage level of UHPC panels were established and parametric analysis was carried out.The results indicate that increasing the concrete strength grade,yield strength of reinforcement,tensile reinforcement ratio,and panel thickness,while reducing the clear span,are beneficial for the blast-resistant performance of UHPC panels.Finally,empirical formulae for p-I diagrams,taking into consideration the abovementioned influencing factors,were proposed and verified for assessing the flexural damage of UHPC panels.These formulae can serve as a valuable reference for evaluating blast-induced damage in UHPC panels.关键词
超高性能混凝土/爆炸荷载/等效单自由度/p-I曲线/损伤评估Key words
ultra-high performance concrete/blast loadings/equivalent single degree of freedom/p-I diagram/damage assessment分类
数理科学引用本文复制引用
苏琼,程月华,吴昊..爆炸荷载作用下UHPC板的弯曲损伤评估[J].爆炸与冲击,2023,43(12):123-138,16.基金项目
国家自然科学基金(52078379) （52078379）
