香蕉纤维加固钢筋混凝土板爆炸作用下动力响应数值模拟研究  

Numerical simulation of dynamic response of reinforced concrete slabs strengthened with banana fiber under blast loading

作　　者：王晓磊[1] 孙炳鑫 刘历波[1] 史红伟 WANG Xiaolei;SUN Bingxin;LIU Libo;SHI Hongwei(College of Civil Engineering,Hebei University of Engineering,Handan 056038,China;China Water Investment Co.,Ltd.,Beijing 100053,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038 [2]中国水务投资有限公司,北京100053

出　　处：《混凝土》2022年第9期44-48,55,共6页Concrete

基　　金：国家自然基金青年科学基金资助项目(51708317)。

摘　　要：运用ABAQUS非线性有限元软件,首先验证了考虑高应变率相关的JH2本构可用来模拟爆炸荷载作用下混凝土的动力响应,然后建立RC板及香蕉纤维防护材料的三维有限元模型,使用COMWEP算法对比分析普通钢筋混凝土板和外贴香蕉纤维的RC板在爆炸冲击荷载作用下的动力响应特性,探究香蕉纤维在爆炸荷载作用下对于钢筋混凝土板的防护机理,分析香蕉纤维复合材料层数、香蕉纤维外贴形式对RC板的动态响应的影响,模拟结果表明,香蕉纤维可增强钢筋混凝土结构的整体性。香蕉纤维的加固使混凝土由冲切破坏变为弯曲变形。降低了爆炸冲击波对混凝土损伤。不同贴片形式的香蕉纤维对RC板的影响具有差异性,中间十字型的加固效果最好、条形分布防护效果次之、中间镂空的防护效果最差。研究结果可以为复合材料加固RC结构提供参考依据。The nonlinear finite element software ABAQUS is used to verify that the JH2 constitutive model considering high strain rate dependence can be used to simulate the dynamic response of concrete under blast loading,then,a three-dimensional finite element model of reinforced concrete slab and banana fiber reinforced concrete slab is established,and the dynamic response of reinforced concrete slab and banana fiber reinforced concrete slab under blast loading is analyzed by using the COMWEP algorithm,the protection mechanism of banana fiber to reinforced concrete slab under blast loading was investigated,and the influence of layers of banana fiber composite and the form of banana fiber sticking on the dynamic response of RC slab was analyzed,banana fiber can enhance the integrity of reinforced concrete structure.The reinforcement of banana fiber makes the concrete change from punching shear failure to bending deformation.The damage of the blast wave to the concrete is reduced.But the more layers of banana fiber,the less strengthening effect.The effect of banana fiber with different patches on RC plate is different,the middle cross is the best,the strip is the second,and the hollow is the worst.The research results can provide a reference for the anti-explosion design of RC structures.

关 键 词：率相关本构 香蕉纤维 抗爆加固 数值模拟 

分 类 号：TU528.572[建筑科学—建筑技术科学]