爆炸荷载作用下BFRC梁的压电骨料损伤评估研究  

Damage Evaluation of BFRC Beams Under Blast Loadings Using Piezoelectric Smart Aggregates

作　　者：许凯[1,2] 黄艳 鲁光涛 冯谦[4] XU Kai;HUANG Yan;LU Guang-tao;FENG Qian(College of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Institute of High Performance Engineering Structure,Wuhan University of Science and Technology,Wuhan 430065,China;Key Laboratory of Metallurgical Equipment and Control Technology(Wuhan University of Science and Technology),Ministry of Education,Wuhan 430081,China;Institute of Seismology,China Earthquake Administration,Wuhan 430071,China)

机构地区：[1]武汉科技大学城市建设学院,武汉430065 [2]武汉科技大学高性能工程结构研究院,武汉430065 [3]冶金装备及其控制教育部重点实验室(武汉科技大学),武汉430081 [4]中国地震局地震研究所,武汉430071

出　　处：《爆破》2022年第4期17-24,79,共9页Blasting

基　　金：国家自然科学基金面上项目(51878628);国家自然科学基金项目青年基金(51808417);湖北省教育厅科学技术研究计划指导性项目(B2019011)。

摘　　要：爆炸荷载可能造成钢筋混凝土(RC)结构的严重破坏。在混凝土材料中掺入玄武岩纤维(BF)是提高钢筋混凝土构件抗爆炸性能的一种手段。梁是钢筋混凝土结构中的重要承载和联系构件。提高梁的抗爆性能可以提高结构的整体抗冲击性能。为了探究爆炸荷载作用下玄武岩纤维增强混凝土(BFRC)梁的抗爆性能,选取3根不同玄武岩纤维体积率(0%、0.1%和0.2%)的试验梁施加爆炸荷载。利用加速度计和应变片监测梁的动态响应,采用嵌入式压电智能骨料监测试验梁在爆炸下构件内部的损伤状况,从试验结果可以看到,在爆炸荷载作用下,与普通RC梁对比,BFRC梁的应变峰值与加速度峰值较小,梁的表面裂纹较少,剥落面积较小。运用小波包能量分析计算梁的损伤指数并以此对比判断BFRC梁在不同炸药当量下产生的内部损伤,研究了不同玄武岩纤维体积掺入率混凝土梁抗爆性能的变化。试验结果表明:掺入玄武岩纤维可以提高混凝土梁的抗爆性能,当玄武岩体积掺入率为0.2%时梁的损伤程度显著下降。Blasting loads may cause severe damage to reinforced concrete(RC)structures.Adding basalt fiber(BF)into concrete is a means to improve the blast resistance of reinforced concrete members.Beam is a vital bearing and connecting member in a reinforced concrete structure.Improving the blast resistance performance of the beam can enhance the overall impact resistance of the frame.Three beams with different basalt fiber volume ratios(0%,0.1%,and 0.2%)were selected to investigate the anti-explosion performance of basalt fiber reinforced concrete(BFRC)beams under blasting loads.The accelerometers and strain gauges recorded test beams′dynamic responses.Meanwhile,the embedded piezoelectric smart aggregates(PSA)were used to monitor the internal damage developments of the beams.The observations show that under the action of blasting loads,compared with ordinary RC beams,the peak strain and acceleration of the BFRC beam are lower.Correspondingly,there are less surface cracks of the beam and a smaller spalling area.Wavelet packet energy method is used to compute the indices for estimating the internal damages of the BFRC beams under different explosives and analyze the change of anti-explosion performance of the concrete beams with different basalt fiber volumes.The test results show that the basalt fiber can improve the anti-explosion performance of concrete beams,and the damage degree of beams decreases significantly when the basalt volume content is 0.2%.

关 键 词：爆炸荷载 损伤监测 压电智能骨料 玄武岩纤维 纤维体积含量 

分 类 号：TU375.1[建筑科学—结构工程]