预应力钢筋混凝土结构抗侵彻性能试验及数值模拟研究

Experimental and Numerical Simulation Research on Penetration Resistance of Prestressed Reinforced Concrete Structure

预应力钢筋混凝土结构是核岛厂房中使用的典型结构,针对预应力钢筋混凝土结构开展抗侵彻能力研究可为相关场景结构状态评估分析提供重要参考。本研究首先针对预应力对钢筋混凝土靶板的抗侵彻能力的影响开展了试验研究,为了进行对比,同时开展普通钢筋混凝土靶板试验,试验结果表明预应力对混凝土靶板正面开坑深度的影响较小,但是初始预应力的施加会使靶板正面开坑范围增加。进一步通过数值模拟分析复现试验全过程,数值模拟结果与试验结果吻合较好,验证了采用的本构模型、参数取值和有限元分析方法的有效性。最后基于数值模拟方法拓展试验工况对不同侵彻速度下预应力靶板的抗侵彻能力进行计算分析,分析结果总体表明预应力对靶板抗侵彻能力的影响较小,预应力增加的围压使得弹体穿过靶板受到的阻力有所增加,弹体穿过预应力钢筋混凝土靶板的剩余速度较普通钢筋混凝土靶板有所降低。

Prestressed reinforced concrete structures are still the commonly used structural form for containment buildings in large pressurized water reactor nuclear power plants.In addition to meeting basic functional requirements,the structures of nuclear power plants may also face various impact events,such as impacts from tornado-borne projectiles,accidental crashes of small airplanes,and the impacts of commercial airliner collisions.Conducting research on the penetration resistance of prestressed reinforced concrete structures can provide important references for assessing and analyzing the structural state in relevant accident scenarios.At present,the basic experimental research on the penetration resistance of prestressed reinforced concrete structures is lacking,and the research on the enhancement effect of the existence of prestressing on the structural penetration resistance is insufficient.Therefore,the experimental research on the penetration resistance of prestressed reinforced concrete structures was conducted and a numerical simulation method through experimental calibration was established.On this basis,the enhancement effect of prestressing on the penetration resistance of the structure was further explored.The experimental results indicate that prestressing has a minimal impact on the depth of the cratering on the front face of the concrete target,but the application of initial prestressing increases the extent of the cratering on the front face.Further numerical simulations were conducted to reproduce the entire experimental process.The numerical simulation results are very consistent with the experimental results,validating the effectiveness of the constitutive model,parameter selection,and finite element analysis method used.Finally,based on the numerical simulation method,the anti-penetration ability of prestressed reinforced concrete target plate under different penetration speeds was calculated and analyzed.The overall analysis results indicate that prestressing has a minor effect on the penetration resistance of the target plate.The increased confining pressure due to prestressing increases the resistance encountered by the projectile passing through the target plate,resulting in a reduced residual velocity of the projectile compared to that when it penetrates a normal target plate.